Pacific Island Ecosystems at Risk (PIER)
Risk Assessments
| Scientific Name | Family | Common name | Risk assessment | Country or Area | Score | Recommendation | 
| Abelia x grandiflora | Caprifoliaceae | glossy abelia | Pacific | -13 | low risk | |
| Abelmoschus manihot | Malvaceae | manioc hibiscus | Assessment | Pacific | 1 | low risk* | 
| Abies fraseri | Pinaceae | Fraser fir | Assessment | Pacific | 3 | evaluate | 
| Abies grandis | Pinaceae | grand fir | Assessment | Pacific | 1 | evaluate | 
| Abies guatemalensis | Pinaceae | Guatemalan Fir | Assessment | Pacific | -2 | low risk | 
| Abies nordmanniana | Pinaceae | Nordmann fir | Assessment | Pacific | 2 | evaluate | 
| Abies procera | Pinaceae | noble fir | Assessment | Pacific | 1 | evaluate | 
| Abies religiosa | Pinaceae | sacred fir | Assessment | Pacific | -2 | low risk | 
| Abrus precatorius | Fabaceae | rosary pea | Assessment | U.S. (Florida) | 16 | reject | 
| Abutilon grandifolium | Malvaceae | Hairy abutilon | Assessment | Pacific | 6 | low risk* | 
| Abutilon megapotamicum | Malvaceae | trailing abutilon | Assessment | U.S. (Florida) | 2 | evaluate | 
| Abutilon hirtum | Malvaceae | Florida Keys Indian mallow | Assessment | U.S. (Florida) | 5 | reject* | 
| Abutilon theophrasti | Malvaceae | velvet leaf | Assessment | Australia | 15 | reject | 
| Acacia auriculiformis | Fabaceae | earleaf acacia | Assessment | Pacific | 13 | high risk | 
| Acacia cochliacantha | Fabaceae | boat thorn acacia | Assessment | Pacific | 10 | high risk | 
| Acacia confusa | Fabaceae | Formosan koa | Assessment | Pacific | 10 | high risk | 
| Fabaceae | northern wattle | Pacific | 7 | high risk | ||
| Acacia dealbata | Fabaceae | silver wattle | Assessment | Pacific | 22 | high risk | 
| Acacia farnesiana | Fabaceae | fragrant acacia | Assessment | Pacific | 14 | high risk | 
| Acacia holosericea | Fabaceae | candelabra wattle | Assessment | Pacific | 4 | evaluate | 
| Acacia insuavis | Fabaceae | pak la | Assessment | Pacific | 5 | evaluate | 
| Acacia longifolia | Fabaceae | Sydney golden wattle | Assessment | Pacific | 10 | high risk | 
| Acacia mangium | Fabaceae | mangium | Assessment | Pacific | 8 | high risk | 
| Acacia mearnsii | Fabaceae | black wattle | Assessment | Pacific | 15 | high risk | 
| Acacia melanoxylon | Fabaceae | blackwood acacia | Assessment | Pacific | 12 | high risk | 
| Acacia nilotica | Fabaceae | black thorn | Assessment | Australia | 13 | reject | 
| Acacia nilotica | Fabaceae | black thorn | Assessment | Pacific | 14 | high risk | 
| Acacia nilotica | Fabaceae | black thorn | Assessment | United States | medium-high risk | |
| Fabaceae | Parramatta green wattle | Pacific | 9 | high risk | ||
| Acacia podalyriifolia | Fabaceae | Queensland silver wattle | Assessment | Pacific | 12 | high risk | 
| Acacia pycnantha | Fabaceae | broadleaf wattle | Assessment | Pacific | 16 | high risk | 
| Accacia retinodes | Fabaceae | water wattle | Assessment | Pacific | 8 | high risk | 
| Acacia robusta | Fabaceae | splendid acacia | Assessment | Pacific | 7 | high risk | 
| Acacia saligna | Fabaceae | Port Jackson wattle | Assessment | Pacific | 17 | high risk | 
| Acca sellowiana | Myrtaceae | pineapple guava | Assessment | Pacific | 5 | evaluate | 
| Acca sellowiana | Myrtaceae | pineapple guava | Assessment | U.S. (Florida) | 5 | evaluate | 
| Acacia stenophylla | Fabaceae | river cooba | Pacific | -2 | low risk* | |
| Acalypha godseffiana | Euphorbiaceae | acalypha | Pacific | -7 | low risk | |
| Acalypha hispida | Euphorbiaceae | chenille plant | Pacific | 2 | low risk* | |
| Acalypha setosa | Euphorbiaceae | Cuban copperleaf | Assessment | U.S. (Florida) | 0 | accept | 
| Acalypha siamensis | Euphorbiaceae | wild tea | Assessment | U.S. (Florida) | 3 | accept* | 
| Acalypha wilkesiana | Euphorbiaceae | beefsteak plant | Pacific | -2 | low risk | |
| Acer rubrum | Aceraceae | red maple | Assessment | Pacific | 8 | high risk | 
| Achillea millefolium | Asteraceae | common yarrow | Assessment | Pacific | 19 | high risk | 
| Acmella grandiflora | Asteraceae | Acmella | Assessment | Pacific | 0 | low risk | 
| Acnistus arborescens | Solanaceae | hollowheart | Assessment | Pacific | 2 | evaluate | 
| Acokanthera schimperi | Apocynaceae | common-poisonbush | Assessment | Pacific | 6 | evaluate | 
| Arecaceae | Everglades palm | Pacific | 2 | evaluate | ||
| Acrocomia aculeata | Arecaceae | coyoli palm | Assessment | Pacific | 5 | low risk* | 
| Actinidia polygama | Actinidiaceae | silvervine | Assessment | Pacific | 2 | evaluate | 
| Actinorhytis calapparia | Arecaceae | calappa palm | Assessment | Pacific | 1 | evaluate | 
| Adansonia digitata | Bombacaceae | baobab tree | Pacific | -6 | low risk | |
| Adansonia rubrostipa | Bombacaceae | fony baobab | Assessment | U.S. (Florida) | -7 | accept | 
| Adansonia suarezensis | Bombacaceae | Suarez baobab | Assessment | U.S. (Florida) | -7 | accept | 
| Adenanthera pavonina | Fabaceae | red bead tree | Assessment | Pacific | 7 | high risk | 
| Adiantopsis chlorophylla | Pteridaceae | Assessment | U.S. (Florida) | 2 | accept* | |
| Adiantum raddianum | Pteridaceae | delta maidenhair | Assessment | Pacific | 15 | high risk | 
| Adiantum thalictroides | Pteridaceae | meadow-rue maidenhair fern | Assessment | U.S. (Florida) | 4 | accept* | 
| Adenium obesum | Apocynaceae | desert rose | Pacific | -8 | low risk | |
| Aechmea blanchetiana | Bromeliaceae | orange blanchetiana | Assessment | Pacific | 0 | low risk | 
| Aechmea fasciata | Bromeliaceae | urn plant | Assessment | Pacific | 2 | low risk* | 
| Aegle marmelos | Rutaceae | Bengal quince | Assessment | Pacific | 4 | evaluate | 
| Aeschynomene americana | Fabaceae | American joint vetch | Assessment | Pacific | 12 | high risk | 
| Aesculus californica | Hippocastanaceae | California buckeye | Assessment | Pacific | 0 | low risk | 
| Afrocarpus falcatus | Podpcar[aceae | bastard yellow wood | Assessment | Pacific | 0 | low risk | 
| Agapanthus africanus | Liliaceae | lily of the Nile | Assessment | Pacific | 2.5 | low risk* | 
| Agapanthus praecox | Liliaceae | common Agapanthus | Assessment | Pacific | 12 | high risk | 
| Agathis robusta | Araucariaceae | Queensland kauri | Pacific | -5 | low risk | |
| Agave americana | Agavaceae | American century plant | Assessment | Pacific | 12 | high risk | 
| Agave americana | Agavaceae | century plant | Assessment | U.S. (Florida) | 14 | reject | 
| Agave filifera | Agavaceae | thread-leaf agave | Assessment | U.S. (Florida) | -1 | accept | 
| Ageratina riparia | Asteraceae | mistflower | Assessment | Australia | 26 | reject | 
| Ageratina riparia | Asteraceae | mistflower | Assessment | United States | medium-high risk | |
| Aglaia odorata | Meliaceae | Chinese perfume plant | Pacific | -4 | low risk | |
| Araceae | Aglaonema | Pacific | 1 | low risk* | ||
| Aglaonema nitidum | Araceae | Aglaonema | Pacific | 0 | low risk | |
| Agonis flexuosa | Myrtaceae | willow myrtle | Assessment | Pacific | 7 | high risk | 
| Agrostemma githago | Caryophyllaceae | common corncockle | Assessment | U.S. (Florida) | 9 | reject | 
| Agrostis stolonifera | Poaceae | carpet bentgrass | Assessment | Pacific | 19 | high risk | 
| Ailanthus altissima | Simaroubaceae | tree of heaven | Assessment | Australia | 12 | reject | 
| Ailanthus altissima | Simaroubaceae | tree of heaven | Assessment | Pacific | 21 | high risk | 
| Aiphanes horrida | Arecaceae | ruffle palm | Assessment | Pacific | 7 | high risk | 
| Aira caryophyllea | Poaceae | silver hairgrass | Assessment | U.S. (Florida) | 9 | reject | 
| Ajania pacifica | Asteraceae | ajania | Assessment | Pacific | 1 | low risk* | 
| Ajuga reptans | Lamiaceae | common bugleweed | Assessment | Pacific | 11 | high risk | 
| Albizia adianthifolia | Fabaceae | West African albizzia | Assessment | Pacific | 9 | high risk | 
| Fabaceae | Chinese albizia | Pacific | 8 | high risk | ||
| Albizia guachepele | Fabaceae | chime tree | Assessment | Pacific | -4 | low risk | 
| Albizia julibrissin | Fabaceae | pink sirus | Assessment | Pacific | 18 | high risk | 
| Albizia julibrissin | Fabaceae | momosa | Assessment | U.S. (Florida) | 21 | reject | 
| Albizia lebbeck | Fabaceae | woman's-tongue tree | Assessment | Australia | 4 | more information | 
| Albizia lebbeck | Fabaceae | woman's-tongue tree | Assessment | Pacific | 7 | high risk | 
| Albizia niopoides | Fabaceae | Caribbean albizia | Assessment | Pacific | 6 | evaluate | 
| Aleurites moluccana | Euphorbiaceae | candlenut tree | Assessment | Pacific | 12 | high risk | 
| Aleurites moluccana | Euphorbiaceae | candlenut tree | Assessment | U.S. (Florida) | 3 | evaluate | 
| Allamanda blanchetii | Apocynaceae | purple allamanda | Assessment | Pacific | 6 | evaluate | 
| Allamanda cathartica | Apocynaceae | golden trumpet Allamanda | Assessment | Pacific | 8 | high risk | 
| Allamanda cathartica | Apocynaceae | golden trumpet Allamanda | Assessment | U.S. (Florida) | 12 | reject | 
| Allamanda schottii | ynaceae | bush allamanda | Assessment | Pacific | 8 | high risk | 
| Allamanda schottii | Apocynaceae | bush allamanda | Assessment | U.S. (Florida) | 7 | reject | 
| Allium sativum | Liliaceae | garlic | Assessment | Pacific | -4 | low risk | 
| Allocasuarina verticillata | Casuarinaceae | drooping she oak | Pacific | -5 | low risk | |
| Allogoptera arenaria | Arecaceae | seashore palm | Assessment | Pacific | 2 | evaluate | 
| Allophylus cobbe | Sapindaceae | wild berry | Assessment | Pacific | 9 | high risk | 
| Alloxylon flammeum | Proteaceae | tree waratah | Assessment | U.S. (Florida) | -2 | accept | 
| Alluaudia procera | Didiereaceae | Madagascar ocotillo | Pacific | -7 | low risk | |
| Alnus nepalensis | Betulaceae | Nepalese alder | Pacific | -2 | low risk | |
| Alocasia cucullata | Araceae | dwarf elephant ear | Assessment | Pacific | 9 | high risk | 
| Alocasia sanderiana | Araceae | Kris plant | Pacific | -2 | low risk | |
| Aloysia citrodora | Verbenaceae | lemon verbena | Assessment | Pacific | 0 | low risk | 
| Alphitonia zizyphoides | Rhamnaceae | toi | Pacific | 0 | low risk | |
| Alpinia purpurata | Zingiberaceae | red ginger | Assessment | Pacific | 4 | evaluate | 
| Alpinia zerumbet | Zingiberaceae | shell ginger | Assessment | Pacific | 10 | high risk | 
| Alpinia zerumbet | Zingiberaceae | shell ginger | Assessment | U.S. (Florida) | 5 | accept* | 
| Alstonia macrophylla | Apocynaceae | deviltree | Assessment | Pacific | 9 | high risk | 
| Alstonia scholaris | Apocynaceae | scholar tree | Assessment | Pacific | 3 | evaluate | 
| Alternanthera brasiliana | Amaranthaceae | Brazilian joyweed | Assessment | U.S. (Florida) | 13 | reject | 
| Alternanthera paronichyoides | Amaranthaceae | smooth joyweed | Assessment | U.S. (Florida) | 6 | accept* | 
| Alternanthera philoxeroides | Amaranthaceae | alligator weed | Assessment | Australia | 22 | reject | 
| Alternanthera pungens | Amaranthaceae | khaki weed | Assessment | Australia | 17 | reject | 
| Alyogyne huegelii | Malvaceae | lilac hibiscus | Assessment | Pacific | 0 | low risk | 
| Alysicarpus vaginalis | Fabaceae | alyce clover | Assessment | Australia | 5 | evaluate | 
| Ambrosia psilostachya | Asteraceae | western ragweed | Assessment | Pacific | 15 | high risk | 
| Amaranthus dubius | Amaranthaceae | southern pigweed | Assessment | Australia | 14 | reject | 
| Amaranthus palmeri | Amaranthaceae | Palmer's amaranth | Assessment | U.S. (Florida) | 11 | reject | 
| Amaranthus spinosus | Amaranthaceae | spiny amaranth | Assessment | U.S. (Florida) | 18 | reject | 
| Amaranthus tricolor | Amaranthaceae | Chinese amaranth | Assessment | Pacific | 14 | high risk | 
| Amherstia nobilis | Fabaceae | pride of Burma | Assessment | Pacific | -8 | low risk | 
| Amorphophallus lambii | Araceae | Assessment | U.S. (Florida) | 2 | accept* | |
| Anacardium occidentale | Anacardiaceae | cashew | Assessment | Pacific | 0 | low risk | 
| Andira inermis | Fabaceae | cabbage tree | Pacific | -3 | low risk | |
| Andropogon bicornis | Poaceae | West Indian foxtail grass | Assessment | Pacific | 18 | high risk | 
| Andropogon gayanus | Poaceae | gamba grass | Assessment | Australia | 8 | reject | 
| Andropogon glomeratus | Poaceae | bushy bluestem | Assessment | Pacific | 14 | high risk | 
| Andropogon virginicus | Poaceae | broomsedge | Assessment | Australia | 13 | reject | 
| Andropogon virginicus | Poaceae | broomsedge | Assessment | Pacific | 20 | high risk | 
| Anemone hupehensis | Ranunculaceae | Japanese anemone | Assessment | Pacific | 8.5 | high risk | 
| Marattiaceae | giant fern | Pacific | 8 | high risk | ||
| Anigozanthos flavidus | Haemodoraceae | Evergreen kangaroo paw | Assessment | Pacific | 12 | high risk | 
| Annonaceae | cherimoya | Pacific | -4 | low risk | ||
| Annona glabra | Annonaceae | pond apple | Assessment | Pacific | 10 | high risk | 
| Annona macroprophyllata | Annonaceae | perpauce | Assessment | Pacific | -2 | low risk | 
| Annona mucosa | Annonaceae | wild sweetsop | Assessment | Pacific | -3 | low risk | 
| Annona muricata | Annonaceae | soursop | Assessment | Pacific | -3 | low risk | 
| Annona reticulata | Annonaceae | custard apple | Assessment | Pacific | 11 | high risk | 
| Annona squamosa | Annonaceae | custard apple | Assessment | Pacific | -2 | low risk | 
| Anredera cordifolia | Basellaceae | Madeira-vine | Assessment | Pacific | 20 | high risk | 
| Anthocleista grandiflora | Gentianaceae | forest bigleaf | Assessment | Pacific | 3 | evaluate | 
| Anthoxanthum nitens | Poaceae | vanilla grass | Assessment | Pacific | 4 | evaluate | 
| Anthoxanthum odoratum | Poaceae | sweet vernalgrass | Assessment | Pacific | 11 | high risk | 
| Anthurium hookeri | Araceae | birds nest anthurium | Pacific | -6 | low risk | |
| Antigonon leptopus | Polygonaceae | coral vine | Assessment | Pacific | 19 | high risk | 
| Aphanamixis polystachya | Meliaceae | pithraj tree | Assessment | Pacific | 3 | evaluate | 
| Aphelandra aurantiaca | Acanthaceae | fiery spike | Assessment | Pacific | -2 | low risk | 
| Aphelandra sinclairiana | Acanthaceae | Sinclair's aphelandra | Assessment | Pacific | -3 | low risk | 
| Aizoaceae | hearts and flowers | Pacific | 5 | low risk* | ||
| Aquilegia caucasica | Ranunculaceae | Assessment | U.S. (Florida) | -1 | accept | |
| Arachis glabrata | Fabaceae | perennial peanut | Pacific | -1 | low risk | |
| Arachis glabrata | Fabaceae | perennial peanut | Assessment | U.S. (Florida) | -11 | accept | 
| Arachis hypogaea | Fabaceae | peanut | Assessment | Pacific | -2 | low risk | 
| Arachis pintoi | Fabaceae | perennial peanut | Pacific | -1 | low risk | |
| Araiostegia pseudocystopteris | Davalliaceae | Assessment | U.S. (Florida) | 3 | accept* | |
| Araucaria araucana | Araucariaceae | Chilean pine | Assessment | Pacific | -1 | low risk | 
| Araucaria bidwillii | Araucariaceae | Queensland pine | Assessment | Pacific | 1 | low risk* | 
| Araucaria columnaris | Araucariaceae | Cooks pine | Pacific | -5 | low risk | |
| Araucaria heterophylla | Araucariaceae | Norfolk Island pine | Pacific | -5 | low risk | |
| Araujia saricifera | Apocynaceae | bladder flower | Assessment | Pacific | 24 | high risk | 
| Archidendron clypearia | Fabaceae | archidendron | Assessment | Pacific | 3 | evaluate | 
| Archontophoenix alexandrae | Arecaceae | Alexandra palm | Assessment | Pacific | 8 | high risk | 
| Arecaceae | king palm | Pacific | 6 | evaluate | ||
| Archontophoenix purpurea | Arecaceae | purple king palm | Assessment | Pacific | 1 | evaluate | 
| Archontophoenix tuckeri | Arecaceae | peach creek palm | Assessment | Pacific | 4 | evaluate | 
| Arctotheca calendula (fertile) | Asteraceae | capeweed | Assessment | Pacific | 24 | high risk | 
| Arctotheca calendula (sterile) | Asteraceae | capeweed | Assessment | Pacific | 8 | high risk | 
| Arctotheca calendula | Asteraceae | capeweed | Assessment | United States | high risk | |
| Ardisia crenata | Myrsinaceae | Hilo holly | Assessment | Pacific | 10 | high risk | 
| Ardisia elliptica | Myrsinaceae | shoebutton ardisia | Assessment | Pacific | 11 | high risk | 
| Ardisia nigrescens | Myrsinaceae | blossomberry ardisia | Assessment | U.S. (Florida) | -1 | accept | 
| Ardisia polysticta | Myrsinaceae | niu zi guo | Assessment | Pacific | 8 | high risk | 
| Ardisia sieboldii | Myrsinaceae | duo zhi zi jin niu | Assessment | Pacific | 7 | high risk | 
| Areca catechu | Arecaceae | betel nut palm | Pacific | -4 | low risk | |
| Areca ridleyana | Arecaceae | Assessment | U.S. (Florida) | 0 | accept | |
| Areca triandra | Arecaceae | Australian areca palm | Assessment | Pacific | 5 | evaluate | 
| Areca vestiaria | Arecaceae | red pinang | Assessment | Pacific | -2 | low risk | 
| Arenga pinnata | Arecaceae | sugar palm | Assessment | Pacific | 7 | high risk | 
| Arenga tremula | Arecaceae | Philippines dwarf sugar palm | Assessment | Pacific | 1 | evaluate | 
| Argemone mexicana | Papaveraceae | Mexican poppy | Assessment | Australia | 18 | reject | 
| Argemone mexicana | Papaveraceae | Mexican poppy | Assessment | Pacific | 22 | high risk | 
| Convolvulaceae | Hawaiian baby woodrose | Pacific | 1 | low risk* | ||
| Aristolochia elegans | Aristolochiaceae | Dutchman's pipe | Assessment | Australia | 13 | reject | 
| Aristolochia ringens | Aristolochiaceae | gaping Dutchman's pipe | Assessment | Pacific | 4 | evaluate | 
| Arnebia pulchra | Boraginaceae | prophet flower | Assessment | U.S. (Florida) | -1 | accept | 
| Artabotrys hexapetalus | Annonaceae | climbing ylang-ylang | Assessment | Pacific | 0 | low risk | 
| Arthrostemma ciliatum | Melastomataceae | pinkfringe | Assessment | Pacific | 7 | high risk | 
| Artocarpus altilis | Moraceae | breadfruit | Pacific | -12 | low risk | |
| Artocarpus heterophyllus | Moraceae | jackfruit | Pacific | 1 | low risk* | |
| Artocarpus heterophyllus | Moraceae | jackfruit | Assessment | U.S. (Florida) | -1 | accept | 
| Artocarpus odoratissimus | Moraceae | marang | Pacific | -3 | low risk | |
| Artocarpus sericicarpus | Moraceae | gomihan | Assessment | Pacific | -2 | low risk | 
| Arundina graminifolia | Orchidaceae | bamboo orchid | Assessment | Pacific | 11 | high risk | 
| Arundo donax | Poaceae | arundo | Assessment | Pacific | 12 | high risk | 
| Arundo donax | Poaceae | arundo | Assessment | U.S. | 11 | reject | 
| Arundo donax | Poaceae | arundo | Assessment | U.S. (Florida) | 11 | reject | 
| Asarum delavayi | Aristolochiaceae | Chinese giant wild ginger | Assessment | U.S. (Florida) | 0 | accept | 
| Asparagus densiflorus | Liliaceae | asparagus fern | Assessment | Australia | 3 | evaluate | 
| Asparagus densiflorus | Liliaceae | asparagus fern | Assessment | Pacific | 15 | high risk | 
| Asparagus falcatus | Liliaceae | sicklethorn | Assessment | Pacific | 11 | high risk | 
| Asparagus setaceus | Liliaceae | common asparagus fern | Assessment | Australia | 16 | reject | 
| Asparagus setaceus | Liliaceae | common asparagus fern | Assessment | Pacific | 13 | high risk | 
| Aspidistra elatior | Liliaceae | cast iron plant | Pacific | -1 | low risk | |
| Aspidistra patentiloba | Liliaceae | Assessment | U.S. (Florida) | 2 | accept* | |
| Aster oharai | Asteraceae | Assessment | U.S. (Florida) | -1 | accept | |
| Asterogyne martiana | Arecaceae | capoca | Assessment | Pacific | 1 | evaluate | 
| Astronium graveolens | Anacardiaceae | zebrawood | Assessment | Pacific | -2 | low risk | 
| Asystasia gangetica | Acanthaceae | coromandel | Assessment | Pacific | 12 | high risk | 
| Atractocarpus fitzalanii | Rubiaceae | randia | Assessment | Pacific | 3 | high risk* | 
| Attalea cohune | Arecaceae | cohune palm | Assessment | Pacific | 0 | low risk | 
| Averrhoa bilimbi | Oxalidaceae | cucumber tree | Assessment | Pacific | 1 | evaluate | 
| Averrhoa carambola | Oxalidaceae | starfruit | Pacific | -1 | low risk | |
| Axonopus compressus | Poaceae | carpetgrass | Assessment | Australia | 12 | reject | 
| Axonopus compressus | Poaceae | carpetgrass | Assessment | Pacific | 15 | high risk | 
| Axonopus fissifolius | Poaceae | carpetgrass | Assessment | Pacific | 16 | high risk | 
| Azadirachta indica | Meliaceae | neem | Assessment | Pacific | 10 | high risk | 
| Baccaurea ramiflora | Phyllanthaceae | Burmese grape | Assessment | Pacific | 0 | low risk | 
| Baccharis halimifolia | Asteraceae | groundsel bush | Assessment | Australia | 19 | reject | 
| Bacopa procumbens | Plantaginaceae | baby jump-up | Assessment | Pacific | 7 | high risk | 
| Balaka longirostris | Arecacear | Mbalaka | Assessment | Pacific | 0 | low risk | 
| Bambusa chungii | Poaceae | emperor's blue bamboo | Assessment | Pacific | -1 | low risk | 
| Bambusa glaucophylla | Poaceae | Malay dwarf bamboo | Assessment | Pacific | -3 | low risk | 
| Bambusa lako | Poaceae | Timor black bamboo | Assessment | Pacific | -1 | low risk | 
| Bambusa lako | Poaceae | Timor black bamboo | Assessment | U.S. (Florida) | 1 | evaluate | 
| Bambusa multiplex | Poaceae | Chinese dwarf bamboo | Assessment | Pacific | 5 | evaluate | 
| Bambusa oldhamii | Poaceae | Oldham's bamboo | Assessment | Pacific | 1 | evaluate | 
| Bambusa textilis | Poaceae | weaver's bamboo | Assessment | Pacific | -3 | low risk | 
| Bambusa vulgaris | Poaceae | bamboo | Assessment | Pacific | 5 | low risk* | 
| Banisteriopsis caapi | Malpighiaceae | caapi | Assessment | Pacific | 0 | low risk | 
| Banksia burdettii | Proteaceae | Burdett's banksia | Assessment | Pacific | -2 | low risk | 
| Banksia ericifolia | Proteaceae | heath banksia | Assessment | Pacific | 9 | high risk | 
| Banksia integrifolia | Proteaceae | coast banksia | Assessment | Pacific | 5 | high risk* | 
| Banksia spinulosa | Proteaceae | hairpin banksia | Assessment | Pacific | 5 | high risk* | 
| Barleria lupulina | Acanthaceae | hophead Phillipine violet | Assessment | Pacific | 10 | high risk | 
| Barringtonia asiatica | Lecythidaceae | sea putat | Pacific | -8 | low risk | |
| Barringtonia edulis | Lecythidaceae | cut nut | Assessment | Pacific | 0 | low risk | 
| Barrya cubensis | Malvaceae | mountain-pear | Assessment | Pacific | 1 | low risk* | 
| Basella alba | Basellaceae | Malabar spinach | Assessment | Pacific | 8 | high risk | 
| Batis maritima | Bataceae | pickleweed, saltwort | Assessment | Pacific | 9 | high risk | 
| Bauhinia binata | Fabaceae | Assessment | Pacific | -1 | low risk | |
| Bauhinia x blakeana | Fabaceae | Hong Kong orchid tree | Pacific | -7 | low risk | |
| Bauhinia hookeri | Fabaceae | white bauhinia | Assessment | Pacific | -4 | low risk | 
| Fabaceae | pink orchid tree | Pacific | 7 | high risk | ||
| Bauhinia natalensis | Fabaceae | Natal bauhinia | Assessment | U.S. (Florida) | 1 | accept* | 
| Bauhinia purpurea | Fabaceae | purple bauhinia | Assessment | Pacific | 7 | high risk | 
| Bauhinia purpurea | Fabaceae | purple bauhinia | Assessment | U.S. (Florida) | 8 | reject | 
| Bauhinia tomentosa | Fabaceae | yellow tree bauhinia | Pacific | -1 | low risk | |
| Bauhinia vahlii | Fabaceae | Bauhinia climber | Assessment | Pacific | 7 | high risk | 
| Fabaceae | mountain ebony | Pacific | 9 | high risk | ||
| Bauhinia variegata | Fabaceae | mountain ebony | Assessment | U.S. (Florida) | 7 | reject | 
| Beaumontia grandiflora | Apocynaceae | Easter-lily-vine | Assessment | Pacific | -6 | low risk | 
| Beaumontia multiflora | Apocynaceae | herald's trumpet | Pacific | -4 | low risk | |
| Beccariophoenix madagascariensis | Arecaceae | window palm | Assessment | Pacific | -7 | low risk | 
| Beesia calthaefolia | Ranunculaceae | Assessment | U.S. (Florida) | 0 | accept | |
| Begonia foliosa | Begoniaceae | Fuchsia begonia | Assessment | Pacific | 9 | high risk | 
| Berberis iberica | Berberidaceae | Iberian barberry | Assessment | U.S. (Florida) | 1 | evaluate | 
| Berchemia zeyheri | Rhamnaceae | pink ivory | Assessment | Pacific | -2 | low risk | 
| Besleria laxiflora | Gesneriaceae | Assessment | U.S. (Florida) | -3 | accept | |
| Beta vulgaris L. ssp. vulgaris convar. saccharifera | Chemopodiaceae | sugar beet | Assessment | Pacific | -6 | low risk | 
| Bidens alba | Asteraceae | beggar's-tick | Assessment | Pacific | 12 | high risk | 
| Bidens pilosa | Asteraceae | Spanish needle | Assessment | Pacific | 23 | high risk | 
| Bidens pilosa | Asteraceae | Spanish needle | Assessment | U.S. (Florida) | 19 | reject | 
| Billbergia pyramidalis | Bromeliaceae | foolproof plant | Assessment | U.S. (Florida) | -1 | accept | 
| Bishofiaceae | bishopwood | Pacific | 7 | high risk | ||
| Bismarckia nobilis | Arecaceae | Bismarck palm | Pacific | -7 | low risk | |
| Bixa orellana | Bixaceae | lipstick tree | Assessment | Pacific | 1 | low risk* | 
| Blechnum appendiculatum | Blechnaceae | palm fern | Assessment | Pacific | 17 | high risk | 
| Blechnum brasiliense | Blechnaceae | red Brazilian tree fern | Assessment | U.S. (Florida) | 0 | accept | 
| Blechnum orientale | Blechnaceae | oriental blechnum | Assessment | Pacific | -1 | low risk | 
| Blutaparon vermiculare | Amaranthaceae | samphire | Assessment | Pacific | 7 | high risk | 
| Bocconia frutescens | Papaveraceae | plume poppy | Assessment | Pacific | 18 | high risk | 
| Boehmeria nivea | Urticaceae | ramie | Assessment | Pacific | 12 | high risk | 
| Boesenbergia rotunda | Zingiberaceae | Chinese-keys | Assessment | Pacific | 0 | low risk | 
| Bolusanthus speciosus | Fabaceae | wisteria tree | Assessment | Pacific | -6 | low risk | 
| Bombax ceiba | Malvaceae | red silk-cotton tree | Assessment | Pacific | 2 | low risk* | 
| Bombax ceiba | Malvaceae | red silk-cotton tree | Assessment | U.S. (Florida) | -4 | accept | 
| Borassus aethiopum | Arecaceae | African fan palm | Assessment | Pacific | -1 | low risk | 
| Bothriochloa bladhii | Poaceae | Caucasian bluestem | Assessment | Pacific | 19 | high risk | 
| Bougainvillea glabra | Nyctaginaceae | paperflower | Pacific | -1 | low risk | |
| Bouteloua aristidoides | Poaceae | needle grama | Assessment | Pacific | 9 | high risk | 
| Brachiaria brizantha x Brachiaria ruziziensis | Poaceae | cv. Mulato | Assessment | Pacific | 2 | low risk* | 
| Brachychiton acerifolius | Sterculiaceae | Illawarra flame tree | Assessment | Pacific | -5 | low risk | 
| Brachychiton populneus | Sterculiaceae | bottletree | Assessment | Pacific | 6 | evaluate | 
| Bracteantha bracteata | Asteraceae | strawflower | Assessment | U.S. (Florida) | 2 | accept* | 
| Brahea armata | Arecaceae | blue hesper palm | Pacific | 3 | low risk* | |
| Brassica juncea | Brassicaceae | canola | Assessment | Pacific | 15 | rish risk | 
| Brassica napus | Brassicaceae | rapeseed, turnip | Assessment | Pacific | 16 | high risk | 
| Brexia madagascariensis | Grossulariaceae | brexia | Pacific | -6 | low risk | |
| Breynia disticha | Euphorbiaceae | snowbush | Assessment | Pacific | -5 | low risk | 
| Bridelia insulana | Phyllanthaceae | Prickly Bridelia | Assessment | Pacific | 1 | evaluate | 
| Brillantaisia lamium | Acanthaceae | Assessment | Australia | 16 | reject | |
| Broussonetia papyrifera | Moraceae | paper mulberry | Assessment | Pacific | 3 | low risk** | 
| Brownea coccinea | Fabaceae | mountain rose | Assessment | Pacific | -5 | low risk | 
| Brownea macrophylla | Fabaceae | Panama flame | Assessment | Pacific | -8 | low risk | 
| Brugmansia candida | Solanaceae | angel's trumpet | Pacific | 2 | low risk* | |
| Brugmansia candida | Solanaceae | angel's trumpet | Assessment | U.S. (Florida) | 2 | evaluate | 
| Brunfelsia americana | Solanaceae | lady of the evening | Assessment | Pacific | -3 | low risk | 
| Brunfelsia australis | Solanaceae | yesterday-today-and-tomorrow | Assessment | Pacific | -3 | low risk | 
| Brunfelsia densifolia | Solanaceae | serpentine hill raintree | Assessment | Pacific | -4 | low risk | 
| Brunfelsia latifolia | Solanaceae | kiss me quick | Assessment | Pacific | -3 | low risk | 
| Buchloe dactyloides | Poaceae | buffalo grass | Pacific | 4.5 | low risk* | |
| Bucida buceras | Combretaceae | black olive | Pacific | -3 | low risk | |
| Bucida molinetii | Combretaceae | spiny black olive | Pacific | -3 | low risk | |
| Buddleja asiatica | Buddlejaceae | Asian butterfly bush | Assessment | Pacific | 9 | high risk | 
| Buddleja davidii | Buddlejaceae | butterfly bush | Assessment | Australia | -4 | accept | 
| Buddleja davidii | Buddlejaceae | butterfly bush | Assessment | Pacific | 13 | high risk | 
| Buddleja madagascariensis | Buddlejaceae | butterfly bush | Assessment | Pacific | 21 | high risk | 
| Buddleja marrubiifolia | Buddlejaceae | woolly butterfly bush | Assessment | Pacific | -3 | low risk | 
| Buddleja officinalis | Buddlejaceae | butterfly bush | Assessment | U.S. (Florida) | 1 | accept* | 
| Buddleja saligna | Buddlejaceae | false olive | Assessment | Pacific | 2 | low risk* | 
| Bunchosia argentea | Malpighiaceae | peanut butter fruit | Assessment | Pacific | -3 | low risk | 
| Butia capitata | Arecaceae | jelly palm | Assessment | Pacific | 0 | low risk | 
| Buxus sempervirens | Buxaceae | common box | Assessment | Pacific | 7.5 | high risk | 
| Byrsonima crassifolia | Malpighiaceae | golden spoon | Assessment | Pacific | 5 | evaluate | 
| Cabomba caroliniana | Cabombaceae | fanwort | Assessment | Australia | 18 | reject | 
| Caesalpinia bonduc | Fabaceae | nickerbean | Pacific | 12 | high risk** | |
| Caesalpinia crista | Fabaceae | gray nicker | Assessment | Pacific | 7 | high risk | 
| Caesalpinia decapetala | Fabaceae | Mysore thorn | Assessment | Pacific | 20 | high risk | 
| Caesalpinia ferrea | Fabaceae | Brazilian ironwood | Assessment | Pacific | -3 | low risk | 
| Caesalpinia latisiliqua | Fabaceae | Assessment | Pacific | 5 | evaluate | |
| Caesalpinia major | Fabaceae | yellow nicker | Pacific | 10 | high risk** | |
| Fabaceae | dwarf poinciana | Pacific | 5 | low risk* | ||
| Fabaceae | pigeon pea | Pacific | 0 | low risk | ||
| Calamus caesius | Aracaceae | sega rattan | Assessment | Pacific | 3 | evaluate | 
| Calathea majestica | Marantaceae | Assessment | Pacific | -1 | low risk | |
| Callaeum macropterum | Malphigiaceae | yellow butterfly vine | Assessment | Pacific | 6 | evaluate | 
| Fabaceae | calliandra | Pacific | 11 | high risk | ||
| Calliandra haematocephala | Fabaceae | red powder puff | Assessment | Pacific | 2 | low risk* | 
| Calliandra haematocephala | Fabaceae | red powder puff | Assessment | U.S. (Florida) | 1 | accept* | 
| Fabaceae | pink powderpuff | Pacific | -4 | low risk | ||
| Calicarpa japonica | Verbenaceae | Japanese beautyberry | Assessment | Pacific | 5 | evaluate | 
| Callistemon citrinus | Myrtaceae | crimson bottlebrush | Pacific | 0 | low risk | |
| Callistemon citrinus | Myrtaceae | crimson bottlebrush | Assessment | U.S. (Florida) | -1 | accept | 
| Callistemon rigidus | Myrtaceae | stiff bottlebrush | Pacific | 1 | low risk* | |
| Callistemon viminalis | Myrtaceae | weeping bottlebrush | Assessment | Pacific | 3 | low risk* | 
| Callistephus chinensis | Asteraceae | China aster | Assessment | U.S. (Florida) | 2 | accept* | 
| Callitris columellaris | Cupressaceae | white cypress-pine | Assessment | Pacific | 9 | high risk | 
| Callitris endlicheri | Cupressaceae | black cypress-pine | Assessment | Pacific | 10 | high risk | 
| Calodendrum capense | Rutaceae | Cape-chestnut | Assessment | Pacific | -1 | low risk | 
| Calophyllum inophyllum | Clusiaceae | kamani | Assessment | Pacific | 6 | evaluate** | 
| Calopogonium mucunoides | Fabaceae | calopo | Assessment | Australia | 10 | reject | 
| Calopogonium mucunoides | Fabaceae | calopo | Assessment | Pacific | 6 | low risk* | 
| Calotropis gigantea | Asclepiadaceae | crownplant | Assessment | Pacific | 15 | high risk | 
| Calotropis procera | Asclepiadaceae | calotrope | Assessment | Australia | 8 | reject | 
| Calotropis procera | Asclepiadaceae | small crownflower | Assessment | Pacific | 15 | high risk | 
| Camelina sativa | Brassicaceae | false flax | Assessment | Pacific | 9.5 | high risk | 
| Camellia sinensis | Theaceae | tea | Assessment | Pacific | -4 | low risk | 
| Annonaceae | perfume tree | Pacific | 3 | low risk* | ||
| Canarium album | Burseraceae | chinese olive | Assessment | Pacific | 3 | evaluate | 
| Canarium indicum | Burseraceae | canarium-nut | Assessment | Pacific | -1 | low risk | 
| Canavalia ensiformis | Fabaceae | horsebean | Assessment | Pacific | 6 | low risk* | 
| Canna indica | Cannaceae | African arrowroot | Assessment | Pacific | 17 | high risk | 
| Cannabis sativa | Cannabaceae | marijuana | Assessment | Pacific | 8.5 | high risk | 
| Caperonia palustris | Euphorbiaceae | Texas weed | Assessment | U.S. (Florida) | 5 | evaluate | 
| Capsicum annuum | Solanaceae | bird pepper | Assessment | Pacific | 1 | low risk* | 
| Solanaceae | wild pepper | Pacific | 5 | low risk* | ||
| Carallia brachiata | Rhizophoraceae | corkwood | Assessment | Pacific | 3 | evaluate | 
| Cardiospermum grandiflorum | Sapindaceae | showy baloonvine | Assessment | Pacific | 18 | high risk | 
| Cardiospermum halicacabum | Sapindaceae | balloon vine | Assessment | Pacific | 12 | high risk | 
| Carex ciliatomarginata | Cyperaceae | Assessment | U.S. (Florida) | 4 | accept* | |
| Carex muskingumensis | Cyperaceae | Muskingum sedge | Assessment | Pacific | 8 | high risk | 
| Caricaceae | papaya | Pacific | 2 | low risk* | ||
| Carica pentagona | Caricaceae | babaco | Assessment | Pacific | -10 | low risk | 
| Carissa bispinosa | Apocynaceae | hedgethorn | Assessment | U.S. (Florida) | 0 | accept | 
| Carissa grandiflora | Apocynaceae | Natal plum | Pacific | -1 | low risk | |
| Carludovica palmata | Cyclanthaceae | Panama hat plant | Assessment | Pacific | 7 | high risk | 
| Carmona retusa | Boraginaceae | Fukien tea | Assessment | Pacific | 4 | evaluate | 
| Carpentaria acuminata | Arecaceae | Carpentaria palm | Assessment | Pacific | -5 | low risk | 
| Carpobrotus edulis | Aizoaceae | ice plant | Assessment | Pacific | 9.5 | high risk | 
| Caryota mitis | Arecaceae | fishtail palm | Assessment | Pacific | 1 | evaluate | 
| Caryota urens | Arecaceae | toddy palm | Assessment | Pacific | 5 | evaluate | 
| Casimiroa edulis | Rutaceae | white sapote | Assessment | Pacific | 2 | low risk* | 
| Cassia bakeriana | Fabaceae | pink shower tree | Assessment | Pacific | -2 | low risk | 
| Cassia fistula | Fabaceae | golden shower tree | Assessment | Pacific | 3 | low risk* | 
| Cassia grandis | Fabaceae | pink shower tree | Pacific | -5 | low risk | |
| Cassia javanica | Fabaceae | pink shower tree | Pacific | -1 | low risk | |
| Cassia x nealiae | Fabaceae | rainbow shower tree | Pacific | -8 | low risk | |
| Cassia roxburghii | Fabaceae | red cassia | Assessment | Pacific | -4 | low risk | 
| Castilla elastica | Moraceae | Panama rubber tree | Assessment | Pacific | 9 | high risk | 
| Casuarina cunninghamiana | Casuarinaceae | cunninghamia beefwood | Assessment | Pacific | 12 | high risk | 
| Casuarina equisetifolia | Casuarinaceae | ironwood | Assessment | Pacific | 21 | high risk | 
| Casuarina glauca | Casuarinaceae | gray sheoak | Assessment | Pacific | 20 | high risk | 
| Catalpa longissima | Bignoniaceae | Jamaica oak | Pacific | 2 | low risk* | |
| Catharanthus roseus | Apocynaceae | Madagascar periwinkle | Assessment | Pacific | 12 | high risk | 
| Ceanothus 'Julia Phelps' | Rhamnaceae | California lilac | Assessment | Pacific | -4 | low risk | 
| Cecropia obtusifolia | Cecropiaceae | trumpet tree | Assessment | Pacific | 10 | high risk | 
| Cecropia peltata | Cecropiaceae | trumpet tree | Assessment | Pacific | 9 | high risk | 
| Cedrela odorata | Meliaceae | Spanish cedar | Assessment | Pacific | 2 | evaluate | 
| Cedrus deodara | Pinaceae | Deodar cedar | Assessment | Pacific | 0 | low risk | 
| Ceiba pentandra | Bombacaceae | kopok tree | Assessment | Pacific | 2 | low risk* | 
| Cenchrus ciliaris | Poaceae | buffelgrass | Assessment | Australia | 7 | reject | 
| Cenchrus echinatus | Poaceae | burgrass | Assessment | Australia | 11 | reject | 
| Centaurea melitensis | Asteraceae | yellow star thistle | Assessment | Pacific | 18 | high risk | 
| Centella asiatica | Apiaceae | Asiatic pennywort | Assessment | Pacific | 7 | high risk | 
| Centranthus ruber | Valerianaceae | red valerian | Assessment | Pacific | 10 | high risk | 
| Centratherum punctatum | Asteraceae | lark daily | Assessment | Pacific | 8 | high risk | 
| Centrosema molle | Fabaceae | centro | Assessment | Pacific | 11 | high risk | 
| Cerastium purpurascens | Caryophyllaceae | Assessment | U.S. (Florida) | 2 | accept* | |
| Ceratonia siliqua | Fabaceae | carob tree | Pacific | 0 | low risk | |
| Ceratonia siliqua | Fabaceae | carob tree | Assessment | U.S. (Florida) | 1 | accept* | 
| Cerbera manghas | Apocynaceae | pink-eyed cerbera | Pacific | 1 | low risk* | |
| Ceroxylon alpinum | Arecaceae | wax palm | Assessment | Pacific | -4 | low risk | 
| Cestrum aurantiacum | Solanaceae | orange cestrum | Assessment | Pacific | 15 | high risk | 
| Cestrum elegans | Solanaceae | crimson cestrum | Assessment | Pacific | 18 | high risk | 
| Cestrum nocturnum | Solanaceae | night-blooming jasmine | Assessment | Pacific | 17 | high risk | 
| Cestrum parqui | Solanaceae | green cestrum | Assessment | Australia | 11 | reject | 
| Fabaceae | partridge pea | Pacific | 0 | low risk | ||
| Chamaedorea elegans | Arecaceae | parlor palm | Assessment | Pacific | 0 | low risk | 
| Chamaedorea metallica | Arecaceae | metallic plam | Assessment | Pacific | -2 | low risk | 
| Chamaedorea seifrizii | Arecaceae | reed palm | Assessment | Pacific | 6 | evaluate | 
| Chamaesyce albomarginata | Euphorbiaceae | rattle snake weed | Assessment | Pacific | 3 | low risk* | 
| Chambeyronia macrocarpa | Arecaceae | Flame Thrower Palm | Assessment | Pacific | -1 | low risk | 
| Chamelaucium uncinatum | Asteraceae | Geraldton wax | Pacific | -2.5 | low risk | |
| Chasmanthium latifolium | Poaceae | northern sea oats | Assessment | Pacific | 8.5 | high risk | 
| Cheilocostus speciosus | Costaceae | crepe-ginger | Assessment | Pacific | 11 | high risk | 
| Chenopodium carinatum | Chenopodiaceae | Tasmanian goosefoot | Assessment | Pacific | 9 | high risk | 
| Chenopodium quinoa | Chenopodiaceae | quinoa | Assessment | Pacific | 5 | evaluate | 
| Chione sylvicola | Rubiaceae | Assessment | U.S. (Florida) | -2 | accept | |
| Chloranthus sessilifolius | Chloranthaceae | Assessment | U.S. (Florida) | 1 | accept* | |
| Chloris barbata | Poaceae | swollen fingergrass | Assessment | Australia | 13 | reject | 
| Chloris gayana | Poaceae | Rhodes grass | Assessment | Australia | 6 | reject | 
| Chlorocardium rodiei | Lauraceae | greenheart tree | Assessment | Pacific | -1 | low risk | 
| Chlorophytum comosum | Liliaceae | spiderplant | Assessment | Pacific | 8 | high risk | 
| Chlorophytum saundersiae | Anthericaceae | Assessment | U.S. (Florida) | 0 | accept | |
| Chloroxylon swietenia | Rutaceae | East Indian satinwood | Assessment | Pacific | -3 | low risk | 
| Chorisia speciosa | Bombacaceae | floss-silk tree | Pacific | -7 | low risk | |
| Chorisia speciosa | Bombacaceae | floss-silk tree | Assessment | U.S. (Florida) | -5 | accept | 
| Chromolaena odorata | Asteraceae | chromolaena | Assessment | Pacific | 34 | high risk | 
| Chrysanthemum cinerariifolium | Asteraceae | pyretrum | Assessment | Pacific | 3 | evaluate | 
| Chrysobalanus icaco | Chrysobalanaceae | coco plum | Assessment | Pacific | 12 | high risk | 
| Chrysophyllum oliviforme | Sapotaceae | satin leaf | Assessment | Pacific | 7 | high risk | 
| Chrysophyllum venezuelanense | Sapotaceae | Assessment | U.S. (Florida) | -5 | accept | |
| Chrysopogon zizanioides (fertile) | Poaceae | vetiver grass wild type | Assessment | Pacific | 9 | high risk | 
| Chrysopogon zizanioides 'Sunshine' | Poaceae | vetiver grass 'Sunshine' | Assessment | Pacific | -8 | low risk | 
| Chrysosplenium valdivicum | Saxifragaceae | Assessment | U.S. (Florida) | -1 | accept | |
| Chrysothemis pulchella | Gesneriaceae | copper leaf | Assessment | Pacific | 3 | low risk* | 
| Cicerbita prenanthoides | Asteraceae | Assessment | U.S. (Florida) | -3 | accept | |
| Cimicifuga brachycarpa | Ranunculaceae | Assessment | U.S. (Florida) | -2 | accept | |
| Cinchona pubescens | Rubiaceae | quinine tree | Assessment | Pacific | 9 | high risk | 
| Cinnamomum aromaticum | Lauraceae | chinese cinnamon | Pacific | -3 | low risk | |
| Cinnamomum bermannii | Lauraceae | Padang cassia | Assessment | Pacific | 12 | high risk | 
| Cinnamomum camphora | Lauraceae | camphor tree | Assessment | Pacific | 7.5 | high risk | 
| Cinnamomum verum | Lauraceae | cinnamon tree | Assessment | Pacific | 10 | high risk | 
| Cirsium vulgare | Asteraceae | spear thistile | Assessment | Australia | 21 | reject | 
| Cirsium vulgare | Asteraceae | bull thistle | Assessment | Pacific | 18.5 | high risk | 
| Vitaceae | rex begonia vine | Pacific | 1 | evaluate | ||
| Cissus nodosa | Vitaceae | Javanese treebine | Assessment | Pacific | 8 | high risk | 
| Cissus quadrangularis | Vitaceae | veldt-grape | Assessment | Pacific | 12 | high risk | 
| Cissus repens | Vitaceae | cissus | Assessment | Pacific | 7 | high risk | 
| Cissus rotundifolia | Vitaceae | Venezuelan treebine | Assessment | Pacific | 9 | high risk | 
| Cisus verticillata | Vitaceae | princess vine | Assessment | Pacific | 12 | high risk | 
| Citharexylum spinosum | Verbenaceae | fiddlewood | Assessment | Pacific | 7 | high risk | 
| Rutaceae | lime | Pacific | 2 | low risk* | ||
| Citrus × Citrofortunella mitis | Rutaceae | calamondin | Pacific | 0 | low risk | |
| Rutaceae | lemon | Pacific | -3 | low risk | ||
| Citrus maxima | Rutaceae | pummelo | Pacific | 0 | low risk | |
| Citrus x paradisi | Rutaceae | grapefruit | Pacific | -8 | low risk | |
| Citrus reticulata | Rutaceae | Mandarin orange | Pacific | -5 | low risk | |
| Citrus sinensis | Rutaceae | sweet orange | Assessment | Pacific | -2 | low risk | 
| Cladochaeta candidissima | Asteraceae | Assessment | U.S. (Florida) | 1 | accept* | |
| Clausena lansium | Rutaceae | Chinese clausena | Assessment | Pacific | 0 | low risk | 
| Cleistocactus baumannii | Cactaceae | firecracker cactus | Assessment | Pacific | -4 | low risk | 
| Clematis hexapetala | Ranunculaceae | Assessment | U.S. (Florida) | 4 | accept* | |
| Verbenaceae | red clerodendrum | Pacific | 7 | high risk | ||
| Clerodendrum chinense | Verbenaceae | Chinese glory bower | Assessment | Pacific | 18 | high risk | 
| Clerodendrum glabrum | Verbenaceae | Natal glorybower | Assessment | Pacific | -1 | low risk | 
| Clerodendrum incisum | Verbenaceae | morning kiss | Assessment | Pacific | 1 | evaluate | 
| Clerodendrum inerme | Verbenaceae | seaside clerodendrum | Assessment | Pacific | 1 | evaluate** | 
| Clerodendrum macrostegium | Verbenaceae | velvetleaf glorybower | Assessment | Pacific | 8 | high risk | 
| Clerodendrum paniculatum | Verbenaceae | pagoda flower | Assessment | Australia | 9 | reject | 
| Clerodendrum paniculatum | Verbenaceae | pagoda flower | Assessment | Pacific | 5 | evaluate | 
| Clerodendrum quadriloculare | Verbenaceae | bronze-leaved clerodendrum | Assessment | Pacific | 11 | high risk | 
| Clerodendrum wallichii | Verbenaceae | chui mo li | Assessment | Pacific | 3 | evaluate | 
| Clidemia hirta | Melastomataceae | Koster's curse | Assessment | Pacific | 27 | high risk | 
| Clitoria ternatea | Fabaceae | butterfly pea | Assessment | Australia | 7 | reject | 
| Fabaceae | butterfly pea | Pacific | 9 | high risk | ||
| Clusia rosea | Clusiaceae | autograph tree | Assessment | Pacific | 9 | high risk | 
| Cnidoscolus acontifolius | Euphorbiaceae | tree spinach | Assessment | Pacific | 10 | high risk | 
| Cnidoscolus chayamansa | Euphorbiaceae | tree spinach | Assessment | Pacific | 1 | low risk* | 
| Coccinia grandis | Cucurbitaceae | ivy gourd | Assessment | Australia | 9 | reject | 
| Coccinia grandis | Cucurbitaceae | ivy gourd | Assessment | Pacific | 21 | high risk | 
| Coccoloba uvifera | Polygonaceae | sea grape | Pacific | -5 | low risk | |
| Coccothrinax barbadensis | Aracaceae | Puerto Rico silver palm | Assessment | Pacific | 2 | evaluate | 
| Cocculus laurifolius | Menispermaceae | cocculus | Assessment | U.S. (Florida) | 0 | accept | 
| Cochlospermum vitifolium | Bixaceae | buttercup tree | Pacific | -4 | low risk | |
| Cocos nucifera | Arecaceae | coconut palm | Assessment | Pacific | -4 | low risk | 
| Codiaeum variegatum | Euphorbiaceae | croton | Pacific | -4 | low risk | |
| Coffea arabica | Rubiaceae | coffee tree | Assessment | Pacific | 2 | high risk* | 
| Coffea liberica | Rubiaceae | Liberian coffee tree | Assessment | Pacific | 1 | evaluate | 
| Coix lacryma-jobi | Poaceae | Job's tears | Assessment | Australia | 4 | more information | 
| Colocasia heterochroma | Araceae | Assessment | U.S. (Florida) | 3 | accept* | |
| Colpothrinax wrightii | Arecaceae | barrel palm | Assessment | Pacific | -2 | low risk | 
| Colubrina asiatica | Rhamnaceae | Asiatic colubrina | Assessment | U.S. (Florida) | 19 | reject** | 
| Colvillea racemosa | Fabaceae | Colville's glory | Assessment | Pacific | -8 | low risk | 
| Combretum bracteosum | Combretaceae | hiccup nut | Assessment | U.S. (Florida) | 4 | accept* | 
| Combretum constrictum | Combretaceae | combretum | Assessment | Pacific | 4 | low risk* | 
| Combretum ovalifolium | Combretaceae | Assessment | U.S. (Florida) | 2 | evaluate | |
| Commelina benghalensis | Commelinaceae | tropical spiderwort | Assessment | U.S. (Florida) | 17 | reject | 
| Commelina communis | Commelinaceae | Asiatic daisy | Assessment | Pacific | 21 | high risk | 
| Commelina diffusa | Commelinaceae | spreading dayflower | Assessment | Pacific | 23 | high risk | 
| Congea tomentosa | Verbenaceae | shower of orchids | Assessment | Pacific | 1 | low risk* | 
| Conocarpus erectus | Combretaceae | buttonwood | Assessment | Pacific | 3 | low risk* | 
| Copaifera langsdorffii | Fabaceae | diesel tree | Assessment | Pacific | 4 | evaluate | 
| Copernicia prunifera | Arecaceae | carnauba wax palm | Assessment | Pacific | 0 | low risk | 
| Coprosma repens | Rubiaceae | creeping mirrorplant | Assessment | Pacific | 8 | high risk | 
| Cordia alliodora | Boraginaceae | Spanish elm | Assessment | Pacific | 8 | high risk | 
| Cordia lutea | Boraginaceae | yellow geiger | Assessment | Pacific | -6 | low risk | 
| Cordia monoica | Boraginaceae | snot berry | Assessment | Pacific | 4 | evaluate | 
| Boraginaceae | geiger tree | Pacific | -1 | low risk | ||
| Cordia subcordata | Boraginaceae | kou | Pacific | -3 | low risk | |
| Cortaderia jubata | Poaceae | purple pampas grass | Assessment | Australia | 22 | reject | 
| Cortaderia jubata | Poaceae | Andean pampas grass | Assessment | Pacific | 26 | high risk | 
| Cortaderia selloana | Poaceae | silver pampas grass | Assessment | Australia | 24 | reject | 
| Cortaderia selloana | Poaceae | pampas grass | Assessment | Pacific | 24 | high risk | 
| Corymbia citriodora | Myrtaceae | lemon-scented gum | Assessment | Pacific | 10 | high risk | 
| Corymbia ficifolia | Myrtaceae | red-flowering gum | Pacific | -7 | low risk | |
| Corynocarpus laevigatus | Corynocarpaceae | karaka nut | Assessment | Pacific | 7 | high risk | 
| Costus dubius | Costaceae | costus | Assessment | Pacific | 8 | high risk | 
| Costus woodsonii | Costaceae | Indian-head ginger | Assessment | Pacific | 11 | high risk | 
| Cotinus coggygria | Anacardiaceae | smoketree | Assessment | Pacific | 4 | evaluate | 
| Cotoneaster pannosus | Rosaceae | silver-leaf cotoneaster | Assessment | Australia | 5 | evaluate | 
| Cotoneaster pannosus | Rosaceae | silver-leaf cotoneaster | Assessment | Pacific | 7 | high risk | 
| Cotoneaster submultiflorus | Rosaceae | many-flowered cotoneaster | Assessment | U.S. (Florida) | 2 | evaluate | 
| Crassula multicava | Crassulaceae | fairy crassula | Assessment | Pacific | 12 | high risk | 
| Crassula ovata | Crassulaceae | jade plant | Assessment | Pacific | -4 | low risk | 
| Crateva religiosa | Capparaceae | spider tree | Assessment | Pacific | 0 | low risk | 
| Cratoxylum formosum | Hypericaceae | pink mempat | Assessment | Pacific | 1 | evaluate | 
| Bignoniaceae | calabash tree | Pacific | -8 | low risk | ||
| Crinum asiaticum | Liliaceae | crinum | Assessment | Pacific | -4 | low risk | 
| Crossandra infundibuliformis | Acanthaceae | firecracker plant | Assessment | Pacific | 2 | low risk* | 
| Crotalaria juncea | Fabaceae | Indian hemp | Assessment | Pacific | 1 | evaluate | 
| Crotalaria retusa | Fabaceae | wedge-leaf crotalaria | Assessment | Australia | 5 | evaluate | 
| Crotalaria spectabilis | Fabaceae | showy crotalaria | Assessment | Australia | 9 | reject | 
| Crotalaria trichotoma | Fabaceae | curara-pea | Assessment | Australia | 4 | more information | 
| Cryptomeria japonica | Taxodiaceae | Japanese cedar | Pacific | -3 | low risk | |
| Cryptostegia grandiflora | Asclepiadaceae | rubbervine | Assessment | Australia | 16 | reject | 
| Cryptostegia grandiflora | Asclepiadaceae | rubbervine | Assessment | Pacific | 28 | high risk | 
| Asclepiadaceae | Madagascar rubber vine | Pacific | 13 | high risk | ||
| Cubanola domingensis | Rubiaceae | Dominica bell flower | Assessment | Pacific | -4 | low risk | 
| Cupania cinerea | Sapindaceae | Assessment | U.S. (Florida) | 1 | evaluate | |
| Cupaniopsis anacardioides | Sapindaceae | carrotwood | Assessment | Pacific | 9 | high risk | 
| Cupaniopsis anacardioides | Sapindaceae | carrotwood | Assessment | U.S. (Florida) | 3 | reject* | 
| Lythraceae | false heather | Pacific | 5 | low risk* | ||
| Lythraceae | Mexican cigar plant | Pacific | 3 | low risk* | ||
| Cuphea subuligera | Lythraceae | mauve cuphea | Assessment | Pacific | 1 | low risk* | 
| Cupressus arizonica | Cupressaceae | Arizona cypress | Assessment | Pacific | 15 | high risk | 
| Cupressus x leylandii | Cupressaceae | Leyland cypress | Assessment | Pacific | -7 | low risk | 
| Cupressus lusitanica | Cupressaceae | Mexican cypress | Assessment | Pacific | 6 | low risk* | 
| Cupressus macrocarpa | Cupressaceae | Monterey cypress | Assessment | Pacific | 7 | high risk | 
| Cupressus sempervirens | Cupressaceae | Italian cypress | Assessment | Pacific | 9 | high risk | 
| Curcuma longa | Zingiberaceae | tumeric | Pacific | -8 | low risk | |
| Curcuma zedoaria | Zingiberaceae | rose tumeric | Assessment | Pacific | -3 | low risk | 
| Cuscuta campestris | Cuscutaceae | golden dodder | Assessment | Australia | 22 | reject | 
| Cussonia paniculata | Araliaceae | mountain cabbage tree | Pacific | -7 | low risk | |
| Cussonia spicata | Araliaceae | cabbage tree | Pacific | -5 | low risk | |
| Cyamopsis tetragonoloba | Fabaceae | cluster bean | Assessment | Pacific | -11 | low risk | 
| Cyanotis cristata | Commelinaceae | Assessment | U.S. (Florida) | 5 | evaluate | |
| Cyathea australis | Cyatheaceae | rough tree fern | Assessment | Pacific | 5 | evaluate | 
| Cyatheaceae | Australian tree fern | Pacific | 8 | high risk | ||
| Cyathea medullaris | Cyatheaceae | black tree fern | Assessment | Pacific | 7 | high risk | 
| Cycas revoluta | Cycadaceae | king sago | Pacific | -2 | low risk | |
| Cyclanthera pedata | Cucurbitaceae | wild cucumber | Assessment | U.S. (Florida) | 1 | evaluate | 
| Cymbopogon citratus | Poaceae | lemongrass | Assessment | Pacific | -2 | low risk | 
| Cynodon dactylon | Poaceae | Bermuda grass | Assessment | Pacific | 22 | high risk | 
| Cyperus esculentus | Cyperaceae | yellow nutsedge | Assessment | U.S. (Florida) | 19 | reject | 
| Cyperaceae | umbrella sedge | Pacific | 17 | high risk | ||
| Cyperus pilosus | Cyperaceae | fuzzy flatsedge | Assessment | U.S. (Florida) | 7 | reject | 
| Cyperus rotundus | Cyperaceae | purple nutsedge | Assessment | Australia | 13 | reject | 
| Cyrtostachys renda | Arecaceae | sealing wax palm | Assessment | Pacific | 1 | evaluate | 
| Dacryodes edulis | Burseraceae | bush buttertree | Assessment | Pacific | -3 | low risk | 
| Dactylis glomerata | Poaceae | barnyard grass | Assessment | Australia | 2 | evaluate | 
| Dactyloctenium aegyptium | Poaceae | beach wiregrass | Assessment | Australia | 11 | reject | 
| Dalbergia latifolia | Fabaceae | black rosewood | Assessment | Pacific | 5 | evaluate | 
| Dalbergia retusa | Fabaceae | Nicaragua rosewood | Pacific | 0 | low risk | |
| Dalbergia sissoo | Fabaceae | Indian rosewood | Assessment | Australia | 21 | reject | 
| Dalbergia sissoo | Fabaceae | Indian rosewood | Assessment | Pacific | 13 | high risk | 
| Dasylirion acrotrichum | Nolinaceae | green desert spoon | Assessment | Pacific | 0 | low risk | 
| Dasylirion quadrangulatum | Nolinaceae | Mexican grass tree | Assessment | Pacific | -4 | low risk | 
| Datura ferox | Solanaceae | fierce thorn-apple | Assessment | Australia | 21 | reject | 
| Datura inoxia | Solanaceae | sacred datura | Assessment | Australia | 21 | reject | 
| Datura metel | Solanaceae | jimson-weed | Assessment | Australia | 21 | reject | 
| Datura stramonium | Solanaceae | jimson-weed | Assessment | Australia | 5 | evaluate | 
| Davallia fejeensis | Davalliaceae | lacy hare's-foot fern | Assessment | Pacific | 6 | low risk* | 
| Delairea odorata | Asteraceae | German ivy | Assessment | Pacific | 14 | high risk | 
| Delonix decaryi | Fabaceae | Assessment | U.S. (Florida) | 1 | accept* | |
| Delonix regia | Fabaceae | flame tree | Assessment | Pacific | -1 | low risk | 
| Delonix velutina | Fabaceae | Assessment | Pacific | -6 | low risk | |
| Dendrocalamus asper | Poaceae | rough giant bamboo | Assessment | Pacific | -3 | low risk | 
| Deplanchea tetraphylla | Bignoniaceae | golden boquet tree | Assessment | Pacific | -2 | low risk | 
| Derris elliptica | Fabaceae | tubaroot | Assessment | Pacific | 7 | high risk | 
| Desmanthus virgatus | Fabaceae | virgate mimosa | Assessment | Australia | 9 | reject | 
| Fabaceae | slender mimosa | Pacific | 12 | high risk | ||
| Desmodium heterophyllum | Fabaceae | hetero | Assessment | Australia | 3 | evaluate | 
| Desmodium incanum | Fabaceae | kaimi clover | Assessment | Australia | 9 | reject | 
| Desmodium nicaraguense | Fabaceae | vara de arco | Assessment | Pacific | -2 | low risk | 
| Desmodium scorpiurus | Fabaceae | Assessment | Australia | 5 | more information | |
| Desmodium tortuosum | Fabaceae | Florida beggarweed | Assessment | Australia | 6 | reject | 
| Desmodium tortuosum | Fabaceae | Florida beggarweed | Assessment | U.S. (Florida) | 14 | reject | 
| Desmodium umbellatum | Fabaceae | horse bush | Pacific | 5 | low risk* | |
| Desmodium uncinatum | Fabaceae | silverleaf desmodium | Assessment | Australia | 6 | reject | 
| Dianella caerulea | Liliaceae | cerulean flaxlily | Assessment | Pacific | 5 | evaluate | 
| Dianella revoluta | Hemerocallidaceae | spreading flax lily | Assessment | Pacific | 2 | low risk* | 
| Dianella tasmanica | Hemerocallidaceae | Tasman flax lily | Assessment | Pacific | 0 | low risk | 
| Dianthus cretaceus | Caryophyllaceae | Assessment | U.S. (Florida) | -1 | accept | |
| Dianthus imereticus | Caryophyllaceae | Assessment | U.S. (Florida) | 0 | accept | |
| Dichorisandra thyrsiflora | Commelinaceae | blue ginger | Pacific | 1 | low risk* | |
| Dichrostachys cinerea | Fabaceae | marabou-thorn | Assessment | Pacific | 16 | high risk | 
| Dictyosperma album | Arecaceae | hurricane palm | Pacific | -3 | low risk | |
| Araceae | dumb cane | Pacific | 7 | high risk | ||
| Digitalis purpurea | Scrophulariaceae | foxglove | Assessment | Pacific | 7.5 | high risk | 
| Digitaria abyssinica | Poaceae | African couch grass | Assessment | Pacific | 16 | high risk | 
| Digitaria insularis | Poaceae | sour grass | Assessment | Pacific | 20 | high risk | 
| Dillenia indica | Dilleniaceae | dillenia | Assessment | Pacific | 0 | low risk | 
| Dillenia reticulata | Dilleniaceae | Assessment | U.S. (Florida) | -2 | accept | |
| Dillenia suffruticosa | Dilleniaceae | shrubby dillenia | Assessment | Pacific | 3 | evaluate | 
| Dimocarpus longan | Sapindaceae | dragon's eye | Assessment | Pacific | -2 | low risk | 
| Dioscorea bulbifera | Dioscoreaceae | air potato | Assessment | Pacific | 13 | high risk | 
| Dioscorea bulbifera | Dioscoreaceae | air potato | Assessment | U.S. (Florida) | 19 | reject | 
| Dioscorea dodecaneura | Dioscoreaceae | Assessment | U.S. (Florida) | 2 | evaluate | |
| Diospyros blancoi | Ebenaceae | velvet apple | Assessment | Pacific | -1 | low risk | 
| Diospyros digyna | Ebenaceae | black sapote | Assessment | Pacific | 7 | high risk | 
| Diospyros vaccinioides | Ebenaceae | small persimmon | Assessment | Pacific | 0 | low risk | 
| Diphysa americana | Fabaceae | guachipelin | Pacific | 0 | low risk | |
| Diplazium esculentum | Dryopteridaceae | vegetable fern | Assessment | Pacific | 8 | high risk | 
| Dischidia ovata | Apocynaceae | watermelon Dischidia | Assessment | Pacific | 0 | low risk | 
| Disporopsis jinfushanensis | Ruscaceae | Assessment | U.S. (Florida) | 0 | accept | |
| Disporum megalanthum | Liliaceae | fairy bells | Assessment | U.S. (Florida) | 0 | accept | 
| Dissotis rotundifolia | Melastomataceae | dissotis | Assessment | Pacific | 10 | high risk | 
| Dolichandrone spathacea | Bignoniaceae | mangrove trumpet-tree | Assessment | Pacific | -5 | low risk | 
| Dolichos lablab | Fabaceae | lablab bean | Assessment | Pacific | -1 | low risk | 
| Dorstenia contrajerva | Moraceae | snakewort | Assessment | Pacific | 9 | high risk | 
| Doryanthes excelsa | Doryanthaceae | giant lily | Assessment | Pacific | 0 | low risk | 
| Dovyalis hebecarpa | Salicaceae | Ceylon gooseberry | Assessment | Pacific | 7 | high risk | 
| Dracaena draco | Agavaceae | dragon tree | Pacific | -5 | low risk | |
| Agavaceae | corn plant | Pacific | 0 | low risk | ||
| Dracaena marginata | Agavaceae | money tree | Pacific | -1 | low risk | |
| Dracaena marginata 'Tricolor' | Agavaceae | tricolor Dracaena | Assessment | Pacific | -1 | low risk | 
| Drepanostachyum falcatum | Poaceae | blue bamboo | Assessment | U.S. (Florida) | -3 | accept | 
| Duranta erecta | Verbenaceae | golden dewdrop | Assessment | Pacific | 13 | high risk | 
| Durio zibethinus | Malvaceae | durian | Assessment | Pacific | -2 | low risk | 
| Dypsis decaryi | Arecaceae | triangle palm | Assessment | Pacific | -7 | low risk | 
| Dypsis lanceolata | Arecaceae | ivovowo palm | Assessment | Pacific | 0 | low risk | 
| Dypsis leptocheilos | Arecaceae | teddy bear palm | Assessment | Pacific | -1 | low risk | 
| Dypsis lutescens | Arecaceae | butterfly palm | Assessment | Pacific | 2 | evaluate | 
| Dypsis madagascariensis | Arecaceae | Malagasy Palm | Assessment | Pacific | 5 | evaluate | 
| Dypsis pembana | Arecaceae | pemba palm | Assessment | Pacific | 0 | low risk | 
| Dysphania ambrosioides | Chenopodiaceae | American wormseed | Assessment | Pacific | 15 | high risk | 
| Echinochloa colona | Poaceae | jungle ricegrass | Assessment | Australia | 9 | reject | 
| Echinochloa esculenta | Poaceae | Japanese millet | Assessment | Pacific | 8 | high risk | 
| Echinochloa polystachya | Poaceae | aleman grass | Assessment | Australia | 13 | reject | 
| Echinochloa stagnina | Poaceae | hippo grass | Assessment | Australia | 4 | evaluate | 
| Echium candicans | Boraginaceae | pride of Madeira | Assessment | Australia | -2 | accept | 
| Egeria densa | Hydrocharitaceae | leafy elodea | Assessment | Australia | 22 | reject | 
| Eichhornia crassipes | Pontederiaceae | water hyacinth | Assessment | Pacific | 26 | high risk | 
| Elaeagnus umbellata | Elaeagnaceae | autumn olive | Assessment | Pacific | 13 | high risk | 
| Elaeis guineensis | Arecaceae | African oil palm | Assessment | Pacific | 10 | high risk | 
| Elaeocarpus angustifolius | Elaeocarpaceae | blue marble tree | Assessment | Pacific | 4 | evaluate | 
| Elaeocarpus hainanensis | Elaeocarpaceae | Hainan elaeocarpus | Assessment | Pacific | 1 | evaluate | 
| Elaeodendron orientale | Celastraceae | false olive | Pacific | -1 | low risk | |
| Elettaria cardamomum | Zingiberaceae | cardamom | Assessment | U.S. (Florida) | -1 | accept | 
| Eleusine coracana | Poaceae | finger millet | Assessment | Pacific | 2 | evaluate | 
| Emex australis | Polygonaceae | spiny emex | Assessment | Australia | 8 | reject | 
| Emex australis | Polygonaceae | spiny emex | Assessment | Pacific | 17 | high risk | 
| Enchylaena tomentosa | Chenopodiaceae | ruby saltbush | Assessment | Pacific | 5 | low risk* | 
| Enterolobium cyclocarpum | Fabaceae | ear tree | Assessment | Pacific | 3 | low risk* | 
| Epimedium chlorandrum | Berberidaceae | bishop's cap | Assessment | U.S. (Florida) | -2 | accept | 
| Epiphyllum oxypetalum | Cactaceae | Dutchman's-pipe cactus | Assessment | Pacific | 2 | low risk* | 
| Epipremnum pinnatum | Araceae | pothos | Assessment | Pacific | 9 | high risk | 
| Epipremnum pinnatum cv. Aureum | Araceae | pothos | Assessment | U.S. (Florida) | 11 | reject | 
| Episcia cupreata | Gesneriaceae | flame violet | Assessment | Pacific | 3 | low risk* | 
| Episcia dianthiflora | Gesneriaceae | lace flower vine | Assessment | Pacific | -2 | low risk | 
| Eragrostis cumingii | Poaceae | Cuming's lovegrass | Assessment | U.S. (Florida) | 2 | accept* | 
| Eragrostis elliottii | Poaceae | blue lovegrass | Assessment | Pacific | 12 | high risk | 
| Eragrostis tenuifolia | Poaceae | elastic grass | Assessment | Australia | 11 | reject | 
| Eranthemum pulchellum | Acanthaceae | blue sage | Pacific | 0 | low risk | |
| Erblichia odorata | Turneraceae | butterfly tree | Assessment | Pacific | 0 | low risk | 
| Eremochloa ophiuroides | Poaceae | centipede grass | Assessment | Pacific | 8 | high risk | 
| Eremospatha macrocarpa | Arecacear | large-fruit rattan palm | Assessment | Pacific | 2 | evaluate | 
| Erica lusitanica | Ericaceae | Spanish heath | Assessment | Pacific | 20.5 | high risk | 
| Erigeron karvinskianus | Asteraceae | Mexican daisy | Assessment | Pacific | 11 | high risk | 
| Eriobotrya japonica | Rosaceae | loquat | Assessment | Pacific | 1 | evaluate | 
| Erythrina abyssinica | Fabaceae | erythrina | Assessment | Pacific | 5 | low risk* | 
| Fabaceae | coral bean tree | Pacific | 6 | evaluate | ||
| Erythrina crista-galli | Fabaceae | cockspur coral tree | Pacific | 6 | low risk* | |
| Erythrina poeppigiana | Fabaceae | coral tree | Assessment | Pacific | 12 | high risk | 
| Erythrina sigmoidea | Fabaceae | Assessment | Pacific | 6 | evaluate | |
| Erythrina speciosa | Fabaceae | coral tree | Assessment | Pacific | 11 | high risk | 
| Fabaceae | December tree | Pacific | 5 | evaluate | ||
| Erythrina variegata | Fabaceae | coral tree | Pacific | -2 | low risk | |
| Escallonia rubra var. macrantha | Grossulariaceae | redclaws | Assessment | Pacific | 4 | evaluate | 
| Eschscholzia californica | Papaveraceae | Californian poppy | Assessment | Pacific | 14 | high risk | 
| Zingiberaceae | torch ginger | Pacific | 1 | evaluate | ||
| Eucalyptus amplifolia | Myrtaceae | cabbage gum | Assessment | U.S. | 2 | evaluate | 
| Eucalyptus amplifolia | Myrtaceae | cabbage gum | Assessment | U.S. (Florida) | 1 | evaluate | 
| Eucalyptus caesia | Myrtaceae | silver princess | Pacific | 0 | low risk | |
| Eucalyptus camaldulensis | Myrtaceae | Murray red gum | Assessment | U.S. | 12 | reject | 
| Eucalyptus camaldulensis | Myrtaceae | Murray red gum | Assessment | U.S. (Florida) | 12 | reject | 
| Eucalyptus cinerea | Myrtaceae | silver dollar gum | Pacific | 4 | low risk* | |
| Eucalyptus cloeziana | Myrtaceae | Queensland messmate | Assessment | Pacific | -1 | low risk | 
| Eucalyptus crebra | Myrtaceae | ironbark | Pacific | -1 | low risk | |
| Eucalyptus deglupta | Myrtaceae | Indonesian gum | Pacific | 2 | low risk* | |
| Eucalyptus dunnii | Myrtaceae | Dunn's white gum | Assessment | Pacific | 0 | low risk | 
| Eucalyptus erythrocorys | Myrtaceae | candle bark gum | Assessment | Pacific | 6 | evaluate | 
| Eucalyptus gardneri | Myrtaceae | blue mallet | Pacific | 0 | low risk | |
| Eucalyptus globulus | Myrtaceae | blue gum | Assessment | Pacific | 10 | high risk | 
| Eucalyptus grandis | Myrtaceae | rose gum | Assessment | Pacific | 11 | high risk | 
| Eucalyptus grandis | Myrtaceae | rose gum | Assessment | U.S. | 8 | reject | 
| Eucalyptus grandis | Myrtaceae | rose gum | Assessment | U.S. (Florida) | 7 | reject | 
| Eucalyptus gunnii | Myrtaceae | cider gum | Assessment | Pacific | 2 | evaluate | 
| Eucalyptus intermedia | Myrtaceae | bloodwood | Pacific | 1 | low risk* | |
| Eucalyptus kruseana | Myrtaceae | Kruse's mallee | Pacific | 0 | low risk | |
| Eucalyptus macrocarpa | Myrtaceae | mottlecah | Assessment | Pacific | 3 | evaluate | 
| Eucalyptus microcorys | Myrtaceae | Australian tallowwood | Pacific | 1 | low risk* | |
| Eucalyptus paniculata | Myrtaceae | grey ironbark | Assessment | Pacific | 11 | high risk | 
| Eucalyptus pellita | Myrtaceae | red mahogany | Assessment | Pacific | 3 | low risk* | 
| Eucalyptus platypus | Myrtaceae | round-leaved moort | Pacific | 0 | low risk | |
| Eucalyptus pulverulenta | Myrtaceae | silver gum | Assessment | Pacific | -1.5 | low risk | 
| Myrtaceae | swamp mahogany | Pacific | 3 | low risk* | ||
| Eucalyptus saligna | Myrtaceae | Sydney blue gum | Assessment | Pacific | 7 | high risk | 
| Eucalyptus salubris | Myrtaceae | gimlet | Pacific | -3 | low risk | |
| Eucalyptus sideroxylon | Myrtaceae | black ironbark | Assessment | Pacific | 2 | low risk* | 
| Eucalyptus stoatei | Myrtaceae | scarlet pear gum | Pacific | -2 | low risk | |
| Eucalyptus tereticornis | Myrtaceae | forest red gum | Pacific | 5 | low risk* | |
| Eucalyptus torelliana | Myrtaceae | blood-leaf gum | Assessment | Pacific | 4 | evaluate | 
| Eucalyptus torquata | Myrtaceae | coral gum | Pacific | -1 | low risk | |
| Eucalyptus urograndis | Myrtaceae | urograndis hybrid | Assessment | Pacific | 1 | low risk* | 
| Eucalyptus urophylla | Myrtaceae | Timor mountain gum | Assessment | Pacific | 4 | low risk* | 
| Eucalyptus yarraensis | Myrtaceae | yarra gum | Assessment | Pacific | 1 | low risk* | 
| Eugenia brasiliensis | Myrtaceae | Brazil cherry | Assessment | Pacific | 1 | evaluate | 
| Eugenia uniflora | Myrtaceae | Surinam cherry | Assessment | Pacific | 12 | high risk | 
| Eugenia uniflora | Myrtaceae | Surinam cherry | Assessment | U.S. (Florida) | 12 | reject | 
| Euphorbia amygdaloides | Euphorbiaceae | wood spurge | Assessment | Pacific | 12 | high risk | 
| Euphorbia cotinifolia | Euphorbiaceae | red spurge | Pacific | -2 | low risk | |
| Euphorbia cyathophora | Euphorbiaceae | fire-on-the-mountain | Assessment | Pacific | 7 | high risk | 
| Euphorbia heterophylla | Euphorbiaceae | milkweed | Assessment | Australia | 14 | reject | 
| Euphorbia hypericifolia | Euphorbiaceae | graceful spurge | Assessment | Pacific | 7 | high risk | 
| Euphorbia ingens | Euphorbiaceae | candelabra tree | Assessment | Pacific | 7 | high risk | 
| Euphorbia lactea | Euphorbiaceae | candelabra spurge | Assessment | Pacific | 8 | high risk | 
| Euphorbia lathyris | Euphorbiaceae | petroleum plant | Assessment | Pacific | 9 | high risk | 
| Euphorbia leucocephala | Euphorbiaceae | pascuita | Pacific | -2 | low risk | |
| Euphorbia milli | Euphorbiaceae | crown of thorns | Assessment | Pacific | 1 | low risk* | 
| Euphorbia pulcherrima | Euphorbiaceae | poinsettia | Pacific | -7 | low risk | |
| Euphorbia pulcherrima | Euphorbiaceae | poinsettia | Assessment | U.S. (Florida) | -3 | accept | 
| Euphorbia stenoclada | Euphorbiaceae | silver thicket | Assessment | Pacific | 3 | evaluate | 
| Euphorbia terracina | Euphorbiaceae | False caper | Assessment | United States | medium-high | |
| Euphorbia tirucalli | Euphorbiaceae | fingertree | Assessment | Pacific | 11 | high risk | 
| Euterpe oleracea | Arecaceae | assai | Assessment | Pacific | 5 | evaluate | 
| Evolvulus glomeratus | Convolvulaceae | blue daze | Pacific | 0 | low risk | |
| Excoecaria indica | Euphorbiaceae | mock willow | Assessment | Pacific | 1 | evaluate | 
| Fagopyrum esculentum | Polygonaceae | buckwheat | Assessment | Pacific | -6 | low risk | 
| Fagraea berteroana | Loganiaceae | pua keni keni | Pacific | -1 | low risk | |
| Falcataria moluccana | Fabaceae | albizia | Assessment | Pacific | 8 | high risk | 
| Faramea multiflora | Rubiaceae | manyflower faramea | Assessment | U.S. (Florida) | -2 | accept | 
| Fargesia nitida | Poaceae | fountain bamboo | Assessment | U.S. (Florida) | -4 | accept | 
| Festuca arundinacea | Poaceae | tall fescue | Assessment | Pacific | 17 | high risk | 
| Ficus benghalensis | Moraceae | banyan | Assessment | Pacific | 3 | low risk* | 
| Ficus benjamina | Moraceae | weeping fig | Assessment | Pacific | 4 | evaluate | 
| Ficus binnendijkii | Moraceae | sabre ficus | Assessment | Pacific | -1 | low risk | 
| Moraceae | common fig | Pacific | 2 | low risk* | ||
| Ficus celebensis | Moraceae | willow-leaved fig | Assessment | Pacific | -3 | low risk | 
| Ficus cordata ssp. salicifolia | Moraceae | willow-leaf fig | Assessment | Pacific | 0 | low risk | 
| Ficus deltoidea | Moraceae | mistletoe fig | Pacific | 0 | low risk | |
| Ficus destruens | Moraceae | strangler fig | Assessment | U.S. (Florida) | -2 | accept | 
| Ficus elastica | Moraceae | India rubber tree | Assessment | Pacific | -5 | low risk | 
| Ficus lyrata | Moraceae | fiddleleaf fig | Pacific | -5 | low risk | |
| Ficus macrophylla | Moraceae | Moreton Bay fig | Assessment | Pacific | 3 | evaluate | 
| Ficus microcarpa | Moraceae | Chinese banyan | Assessment | Pacific | 10 | high risk | 
| Ficus microcarpa | Moraceae | Chinese banyan | Assessment | U.S. (Florida) | 12 | reject | 
| Ficus natalensis | Moraceae | Natal fig | Assessment | Pacific | 1 | evaluate | 
| Ficus pumila | Moraceae | creeping fig | Pacific | 2 | low risk* | |
| Ficus pumila | Moraceae | creeping fig | Assessment | U.S. (Florida) | 10 | reject | 
| Ficus religiosa | Moraceae | bo tree | Assessment | Pacific | 7 | high risk | 
| Ficus rubiginosa | Moraceae | Port Jackson fig | Assessment | Pacific | 7 | high risk | 
| Ficus tikoua | Moraceae | waipahu fig | Pacific | -3 | low risk | |
| Ficus virens | Moraceae | spotted fig | Assessment | Pacific | 5 | evaluate** | 
| Filicium decipiens | Sapindaceae | soapberry | Assessment | Pacific | 2 | evaluate | 
| Filipendula glaberrima | Rosaceae | Assessment | U.S. (Florida) | -2 | accept | |
| Fittonia verschaffeltii | Acanthaceae | nerve plant | Assessment | U.S. (Florida) | -3 | accept | 
| Flacourtia indica | Flacourtiaceae | govenor's plum | Assessment | Pacific | 12 | high risk | 
| Flacourtia montana | Flacourtiaceae | mountain sweet thorn | Assessment | U.S. (Florida) | -2 | accept | 
| Flemingia macrophylla | Fabaceae | Assessment | Pacific | 5 | evaluate | |
| Flemingia strobilifera | Fabaceae | wild hops | Assessment | Pacific | 5 | evaluate | 
| Flindersia brayleyana | Rutaceae | Queensland maple | Assessment | Pacific | -3 | low risk | 
| Flueggea virosa | Euphorbiaceae | white-berry bush | Assessment | Pacific | 7 | high risk | 
| Foeniculum vulgare | Apiaceae | fennel | Assessment | Australia | 7 | reject | 
| Foeniculum vulgare | Apiaceae | fennel | Assessment | Pacific | 19 | high risk | 
| Fortunella crassifolia | Rutaceae | meiwa kimquat | Assessment | Pacific | -10 | low risk | 
| Fortunella japonica | Rutaceae | round kumquat | Assessment | U.S. (Florida) | -3 | accept | 
| Frangula californica | Rhamnaceae | coffeeberry | Assessment | Pacific | 5 | high risk* | 
| Fraxinus uhdei | Oleaceae | tropical ash | Assessment | Pacific | 11 | high risk | 
| Fremontodendron californicum | Sterculiaceae | flannelbush | Assessment | Pacific | 3 | low risk* | 
| Fritillaria caucasica | Liliaceae | Assessment | U.S. (Florida) | 2 | accept* | |
| Funtumia elastica | Apocynaceae | African rubber tree | Assessment | Pacific | 10 | high risk | 
| Galphimia gracilis | Malphigiaceae | slender goldshower | Pacific | -2 | low risk | |
| Garcinia mangostana | Clusiaceae | mangosteen | Assessment | Pacific | -5 | low risk | 
| Garcinia xanthochymus | Clusiaceae | yellow mangosteen | Assessment | Pacific | 4 | evaluate | 
| Gardenia jasminoides | Rubiaceae | Cape jasmine | Pacific | 0 | low risk | |
| Gardenia taitensis | Rubiaceae | Tahitian gardenia | Pacific | -4 | low risk | |
| Gardenia thunbergia | Rubiaceae | wild gardenia | Assessment | Pacific | -4 | low risk | 
| Gaura lindheimeri | Onagraceae | gaura | Assessment | Pacific | 2 | low risk* | 
| Gaussia attenuata | Arecaceae | llume palm | Assessment | Pacific | 0 | low risk | 
| Gazania rigens var. leucolaena | Asteraceae | trailing gazania | Assessment | Pacific | 9 | high risk | 
| Genipa americana | Rubiaceae | genipap | Assessment | U.S. (Florida) | 3 | accept* | 
| Geonoma interrupta | Arecaceae | chontilla | Assessment | Pacific | 6 | high risk | 
| Geranium ruprechtii | Geraniaceae | cranesbill | Assessment | U.S. (Florida) | 3 | accept* | 
| Gigantochloa apus | Poaceaae | Tabashir bamboo | Assessment | Pacific | 2 | low risk* | 
| Gigantochloa atter | Poaceaae | sweet bamboo | Assessment | Pacific | -3 | low risk | 
| Gigantochloa robusta | Poaceaae | robust bamboo | Assessment | Pacific | -4 | low risk | 
| Ginkgo biloba | Ginkgoaceae | ginkgo | Assessment | Pacific | 0 | low risk | 
| Gironniera parvifolia | Ulmaceae | Assessment | U.S. (Florida) | -4 | accept | |
| Gliricidia sepium | Fabaceae | mother of cacao | Assessment | Australia | 4 | evaluate | 
| Gliricidia sepium | Fabaceae | mother of cacao | Assessment | Pacific | -3 | low risk | 
| Gloriosa superba | Liliaceae | flame lily | Assessment | U.S. (Florida) | 14 | reject | 
| Gmelina arborea | Verbenaceae | gmelina | Assessment | Pacific | 2 | low risk* | 
| Gmelina asiatica | Verbenaceae | badhara bush | Assessment | Australia | 14 | reject | 
| Gmelina asiatica | Verbenaceae | Asian bushbeech | Assessment | Pacific | 13 | high risk | 
| Godmania aesculifolia | Bignoniaceae | cachillo | Assessment | Pacific | -3 | low risk | 
| Gomphocarpus physocarpus | Asclepiadaceae | balloon plant | Assessment | Australia | 6 | reject | 
| Gomphocarpus physocarpus | Asclepiadaceae | milkweed | Assessment | Pacific | 8 | high risk | 
| Gomphrena globosa | Amaranthaceae | globe amaranth | Assessment | Pacific | 8 | high risk | 
| Gomphrena globosa | Amaranthaceae | globe amaranth | Assessment | U.S. (Florida) | 8 | reject | 
| Gossypium barbadense | Malvaceae | sea island cotton | Assessment | Pacific | 5 | evaluate | 
| Gossypium hirsutum | Malvaceae | upland cotton | Assessment | Pacific | 9 | high risk | 
| Graptopetalum paraguayense | Crassulaceae | Ghost Plant | Assessment | Pacific | 2 | low risk* | 
| Graptophyllum pictum | Acanthaceae | caricature-plant | Pacific | -5 | low risk | |
| Grevillea banksii | Proteaceae | Bank's grevillea | Assessment | Pacific | 8 | high risk | 
| Grevillea robusta | Proteaceae | silky oak | Assessment | Pacific | 5 | evaluate | 
| Grevillea rosmarinifolia | Proteaceae | rosmary grevilea | Assessment | Pacific | 4 | evaluate | 
| Grewia flavescens | Malvaceae | sandpaper raisin | Assessment | U.S. (Florida) | 0 | accept | 
| Grewia micrantha | Malvaceae | golden fruit raisin | Assessment | Pacific | 5 | evaluate | 
| Grewia occidentalis | Malvaceae | lavender star flower | Pacific | -3 | low risk | |
| Griffonia simplicifolia | Fabaceae | griffonia | Assessment | Pacific | 0 | low risk | 
| Guaiacum officinale | Zygophyllaceae | lignum vitae | Pacific | -6 | low risk | |
| Guaiacum sanctum | Zygophyllaceae | holywood | Assessment | Pacific | 3 | evaluate | 
| Guettarda speciosa | Rubiaceae | beach gardenia | Assessment | Pacific | -1 | low risk | 
| Gutierrezia sarothrae | Asteraceae | broom snakeweed | Assessment | Pacific | 15 | high risk | 
| Guzmania lindenii | Bromeliaceae | guzmania | Assessment | Pacific | 7 | high risk | 
| Gymnocoronis spilanthoides | Asteraceae | Senegal tea | Assessment | Australia | 7 | reject | 
| Gymnosporia emarginata | Celastraceae | kankera | Assessment | Pacific | 2 | evaluate | 
| Gymnostoma papuanum | Casurinaceae | gymnostoma | Assessment | Pacific | 0 | low risk | 
| Gynura aurantiaca | Asteraceae | purple velvet plant | Assessment | U.S. (Florida) | -4 | accept | 
| Haematoxylum campechianum | Fabaceae | campechewood | Assessment | Australia | 8 | reject | 
| Haematoxylum campechianum | Fabaceae | campechewood | Assessment | Pacific | 8 | high risk | 
| Hakea salicifolia | Porteaceae | willow hakea | Assessment | Pacific | 13 | high risk | 
| Hamelia patens | Rubiaceae | firebush | Assessment | Pacific | 7 | high risk | 
| Hapaline benthamiana | Araceae | Assessment | U.S. (Florida) | 1 | accept | |
| Haplophragma adenophyllum | Bignoniaceae | karenwood | Assessment | Pacific | 0 | low risk | 
| Harpephyllum caffrum | Anacardiaceae | wild plum | Assessment | Pacific | -1 | low risk | 
| Harpullia pendula | Sapindaceae | tulipwood | Pacific | -4 | low risk | |
| Hedera algeriensis | Araliaceae | Algerian ivy | Assessment | Pacific | 4 | high risk* | 
| Hedera canariensis | Araliaceae | Canary ivy | Assessment | U.S. (Florida) | 13 | reject | 
| Hedera helix | Araliaceae | English ivy | Assessment | Pacific | 10 | high risk | 
| Hedera pastuchovii | Araliaceae | Russian ivy | Assessment | U.S. (Florida) | 3 | evaluate | 
| Hedychium coronarium | Zingiberaceae | white ginger | Assessment | Pacific | 10 | high risk | 
| Hedychium flavescens | Zingiberaceae | yellow ginger | Assessment | Pacific | 11 | high risk | 
| Zingiberaceae | kahili ginger | Pacific | 16 | high risk | ||
| Helianthus annuus | Asteraceae | sunflower | Assessment | Pacific | 10.5 | high risk | 
| Helianthus argophyllus | Asteraceae | silverleaf sunflower | Assessment | U.S. (Florida) | 3 | accept* | 
| Heliconia caribaea | Heliconiaceae | heliconia | Assessment | Pacific | -1 | low risk | 
| Heliconia psittacorum | Heliconiaceae | parrot's beak | Assessment | Pacific | 11 | high risk | 
| Heliconiaceae | small lobster claw | Pacific | 6 | low risk* | ||
| Heliconia steyermarkii | Heliconiaceae | Assessment | U.S. (Florida) | -2 | accept | |
| Helictotrichon sempervirens | Poaceae | blue oat grass | Assessment | Pacific | 1 | low risk* | 
| Heliocarpus popayanensis | Tiliaceae | moho | Assessment | Pacific | 7 | high risk | 
| Hemerocallis citrina | Liliaceae | citron day-lily | Assessment | Pacific | -7 | low risk | 
| Hemerocallis fulva var. aurantiaca | Liliaceae | day lily | Assessment | Pacific | -3 | low risk | 
| Hemerocallis lilioasphodelus | Liliaceae | lemon day-lily | Assessment | Pacific | -1 | low risk | 
| Hemerocallis thunbergii | Liliaceae | late yellow day-lily | Assessment | Pacific | -6 | low risk | 
| Hemigraphis alternata | Acanthaceae | metal leaf | Assessment | Pacific | 1 | low risk* | 
| Heritiera littoralis | Sterculiaceae | looking-glass tree | Pacific | -2 | low risk | |
| Hernandia ovigera | Hernandiaceae | jack in the box tree | Pacific | -4 | low risk | |
| Hernandia sonora | Hernandiaceae | toporite | Pacific | -5 | low risk | |
| Heteromeles arbutifolia | Rosaceae | Christmas berry | Assessment | Pacific | 9 | high risk | 
| Herterospathe elata | Arecaceae | sagisi palm | Assessment | Pacific | 5 | evaluate | 
| Hibiscus calyphyllus | Malvaceae | lemonyellow rosemallow | Pacific | 1 | low risk* | |
| Hibiscus immaculatus | Malvaceae | koki‘o ke‘oke‘o | Assessment | Pacific | -3 | low risk | 
| Hibiscus insularis | Malvaceae | Philip Island hibiscus | Assessment | Pacific | -3 | low risk | 
| Hibiscus mutabilis | Malvaceae | cotton rose | Assessment | Pacific | 0 | low risk | 
| Malvaceae | Chinese hibiscus | Pacific | -2 | low risk | ||
| Hibiscus sabdariffa | Malvaceae | roselle | Pacific | 6 | low risk* | |
| Malvaceae | coral hibiscus | Pacific | -4 | low risk | ||
| Hibiscus syriacus | Malvaceae | rose of Sharon | Assessment | Pacific | 5 | evaluate | 
| Hibiscus tiliaceus | Malvaceae | mahoe | Assessment | U.S. (Florida) | 11 | reject** | 
| Hippeastrum puniceum | Liliaceae | Barbados lily | Pacific | 2 | low risk* | |
| Malpighiaceae | hiptage | Pacific | 8 | high risk | ||
| Holcus lanatus | Poaceae | common velvet grass | Assessment | Australia | 15 | reject | 
| Holmskioldia sanguinea | Verbenaceae | Chinese hatplant | Pacific | -1 | low risk | |
| Holmskioldia tettensis | Verbenaceae | purple Chinese hatplant | Assessment | Pacific | -5 | low risk | 
| Homalanthus populifolius | Euphorbiaceae | bleeding heart tree | Assessment | Pacific | 15 | high risk | 
| Houttuynia cordata | Saururaceae | chameleon-plant | Assessment | Pacific | 8 | high risk | 
| Howea forsteriana | Arecaceae | kantia palm | Assessment | Pacific | 3 | evaluate | 
| Hoya australis | Asclepiadaceae | Samoan wax flower | Assessment | Pacific | 8 | high risk | 
| Hoya multiflora | Asclepiadaceae | wax plant | Assessment | Pacific | -2 | low risk | 
| Hunnemannia fumanifolia | Papaveraceae | goldencup | Assessment | Pacific | 3 | low risk* | 
| Hura crepitans | Euphorbiaceae | sandbox tree | Assessment | Pacific | 8 | high risk | 
| Hydrilla verticillata | Hydrocharitaceae | hydrilla | Assessment | Australia | 20 | reject | 
| Hygrophila polysperma | Acanthaceae | East Inian swampweed | Assessment | Pacific | 20 | high risk | 
| Hymenachne amplexicaulis | Poaceae | hymenachne | Assessment | Australia | 21 | reject | 
| Hymenaea courbaril | Fabaceae | West Indian locust | Assessment | Pacific | 0 | low risk | 
| Hyophorbe lagenicaulis | Arecaceae | bottle palm | Pacific | -3 | low risk | |
| Hyophorbe verschaffeltii | Arecaceae | spindle palm | Assessment | Pacific | -5 | low risk | 
| Hyparrhenia rufa | Poaceae | thatching grass | Assessment | Australia | 7 | reject | 
| Hypericum androsaemum | Clusiaceae | amber | Assessment | Australia | 18 | reject | 
| Hypericum canariense | Clusiaceae | Canary Islands St. Johnswort | Assessment | Australia | 14 | reject | 
| Hypericum canariense | Clusiaceae | Canary Islands St. Johnswort | Assessment | Pacific | 9 | high risk | 
| Hypericum perforatum | Clusiaceae | goatweed | Assessment | Pacific | 12 | high risk | 
| Hypoestes phyllostachya | Acanthaceae | polka dot plant | Assessment | Pacific | 20 | high risk | 
| Hyptis capitata | Lamiaceae | knobweed | Assessment | Australia | 17 | reject | 
| Hyptis pectinata | Lamiaceae | comb bushmint | Assessment | U.S. (Florida) | 11 | reject | 
| Hyptis suaveolens | Lamiaceae | wild spikenard | Assessment | Australia | 19 | reject | 
| Iguanura bicornis | Arecaceae | horned seed palm | Assessment | Pacific | -1 | low risk | 
| Ilex aquifolium | Aquifoliaceae | English holly | Assessment | Pacific | 17 | high risk | 
| Ilex cassine | Aquifoliaceae | dahoon holly | Assessment | Pacific | 3 | evaluate | 
| Ilex dimorphophylla | Aquifoliaceae | Okinawan holly | Assessment | Pacific | 2 | low risk | 
| Ilex guayusa | Aquifoliaceae | guayusa | Assessment | U.S. (Florida) | 0 | accept | 
| Ilex paraguariensis | Aquifoliaceae | yerba mate | Assessment | Pacific | 8 | high risk | 
| Ilex vomitoria forma 'Pendula | Aquifoliaceae | weeping yaupon holly | Assessment | Pacific | 3.5 | evaluate | 
| Impatiens balsamina | Balsaminaceae | impatiens | Assessment | Pacific | 5 | evaluate | 
| Impatiens hawkeri | Balsaminaceae | New Guinea impatiens | Assessment | Pacific | 8 | high risk | 
| Impatiens walleriana | Balsaminaceae | garden impatiens | Assessment | Pacific | 6 | low risk* | 
| Imperata cylindrica | Poaceae | cogon grass | Assessment | Pacific | 22 | high risk | 
| Imperata cylindrica | Poaceae | cogon grass | Assessment | U.S. (Florida) | 26 | reject | 
| Indigofera hirsuta | Fabaceae | hairy indigo | Assessment | Australia | 8 | reject | 
| Indigofera hirsuta | Fabaceae | hairy indigo | Assessment | U.S. (Florida) | 13 | reject | 
| Indigofera spicata | Fabaceae | creeping indigo | Assessment | Australia | 6 | more information | 
| Indigofera suffruticosa | Fabaceae | indigo | Assessment | Australia | 6 | more information | 
| Indigofera suffruticosa | Fabaceae | indigo | Assessment | Pacific | 11 | high risk | 
| Indigofera teysmannii | Fabaceae | neel | Pacific | 0 | low risk | |
| Inga edulis | Fabaceae | ice cream bean | Assessment | Pacific | 3 | evaluate | 
| Inga feuilleei | Fabaceae | ice cream bean | Assessment | Pacific | 3 | evaluate | 
| Inga laurina | Fabaceae | guama | Assessment | Pacific | 6 | evaluate | 
| Inocarpus fagifer | Fabaceae | Polynesian chestnut | Pacific | -3 | low risk | |
| Intsia bijuga | Fabaceae | kwila | Pacific | -6 | low risk | |
| Ipomoea aquatica | Convolvulaceae | water spinach | Assessment | United States | noxious weed | |
| Ipomoea batatas | Convolvulaceae | sweet potato | Assessment | Pacific | 2 | low risk* | 
| Ipomoea horsfalliae | Convolvulaceae | Kuhio vine | Pacific | 1 | low risk* | |
| Ipomoea horsfalliae | Convolvulaceae | prince's vine | Assessment | U.S. (Florida) | 4 | accept | 
| Ipomoea obscura | Convolvulaceae | obscure morning glory | Assessment | Pacific | 10 | high risk | 
| Ipomoea quamoclit | Convolvulaceae | cypress vine | Assessment | Pacific | 14 | high risk | 
| Ipomoea triloba | Convolvulaceae | three-lobed morning glory | Assessment | Pacific | 15 | high risk | 
| Iresine herbstii | Amaranthaceae | blood leaf | Pacific | 0 | low risk | |
| Iris caucasica | Iridaceae | Assessment | U.S. (Florida) | 2 | accept* | |
| Isachne globosa | Poaceae | swamp millet | Assessment | Australia | 18 | reject | 
| Ischaemum polystachyum | Poaceae | paddle grass | Assessment | Pacific | 20 | high risk | 
| Ixora chinensis | Rubiaceae | Chinese ixora | Assessment | Pacific | -2 | low risk | 
| Ixora coccinea | Rubiaceae | jungle flame | Assessment | Pacific | 4 | evaluate | 
| Ixora pavetta | Rubiaceae | torchwood | Assessment | Pacific | 1 | evaluate | 
| Jacaranda mimosifolia | Bignoniaceae | jacaranda | Assessment | Pacific | 1 | low risk* | 
| Jasminum fluminense | Oleaceae | Brazilian jasmine | Assessment | Pacific | 16 | high risk | 
| Jasminum grandiflorum | Oleaceae | Spanish jasmine | Assessment | Pacific | 2 | low risk* | 
| Jasminum mesnyi | Oleaceae | primrose jasmine | Pacific | 2.5 | low risk* | |
| Jasminum multiflorum | Oleaceae | star jasmine | Pacific | 2 | low risk* | |
| Jasminum polyanthum | Oleaceae | winter jasmine | Assessment | Pacific | 10 | high risk | 
| Jatropha curcas | Euphorbiaceae | physic nut | Assessment | Australia | 11 | reject | 
| Jatropha curcas | Euphorbiaceae | physic nut | Assessment | Pacific | 17 | high risk | 
| Jatropha curcas | Euphorbiaceae | physic nut | Assessment | U.S. | 19 | reject | 
| Jatropha curcas | Euphorbiaceae | physic nut | Assessment | U.S. (Florida) | 19 | reject | 
| Jatropha gossypiifolia | Euphorbiaceae | cotton-leaved physic nut | Assessment | Australia | 12 | reject | 
| Jatropha gossypiifolia | Euphorbiaceae | cotton-leaved physic nut | Assessment | Pacific | 18 | high risk | 
| Jatropha integerrima | Euphorbiaceae | peregrina | Pacific | 0 | low risk | |
| Jatropha multifida | Euphorbiaceae | coralplant | Assessment | Pacific | 8 | high risk | 
| Jatropha podagrica | Euphorbiaceae | gout stalk | Assessment | Pacific | 2 | low risk* | 
| Joannesia princeps | Euphorbiaceae | arara nut tree | Assessment | Pacific | 0 | low risk | 
| Juncus acutus | Juncaceae | spiny rush | Assessment | Australia | 15 | reject | 
| Juniperus bermudiana | Cupressaceae | Bermuda juniper | Assessment | Pacific | 7 | high risk | 
| Juniperus chinensis | Cupressaceae | Chinese juniper | Pacific | -3 | low risk | |
| Justicia betonica | Acanthaceae | squirrels-tail | Assessment | Pacific | 12 | high risk | 
| Justicia brandegeeana | Acanthaceae | shrimp plant | Pacific | -1 | low risk | |
| Justicia carnea | Acanthaceae | Brazilian plume | Assessment | Pacific | 12 | high risk | 
| Justicia pectoralis | Acanthaceae | death angel | Assessment | Pacific | 8 | high risk | 
| Justicia spicigera | Acanthaceae | firecracker bush | Assessment | Pacific | 8 | high risk | 
| Kaempferia galanga | Zingiberaceae | galanga | Assessment | Pacific | 1 | low risk* | 
| Crassulaceae | velvet leaf | Pacific | 4 | evaluate | ||
| Kalanchoe delagoensis | Crassulaceae | chandelier plant | Assessment | Pacific | 9 | high risk | 
| Kalanchoe gatonis-bonnieri | Crassulaceae | palm beachbells | Assessment | U.S. (Florida) | 2 | accept* | 
| Kalanchoe laciniata | Crassulaceae | christmastree plant | Assessment | U.S. (Florida) | 2 | accept* | 
| Kalanchoe pinnata | Crassulaceae | air plant | Assessment | U.S. (Florida) | 16 | reject | 
| Kalanchoe tomentosa | Crassulaceae | panda plant | Assessment | Pacific | 4 | low risk* | 
| Keteleeria davidiana | Pinaceae | common keteleeria | Assessment | Pacific | 0 | low risk | 
| Khaya anthotheca | Meliaceae | East African mahogany | Assessment | Pacific | -1 | low risk | 
| Khaya senegalensis | Meliaceae | African mahogany | Assessment | Pacific | 0 | low risk | 
| Kigelia africana | Bignoniaceae | sausage tree | Assessment | Pacific | 0 | low risk | 
| Kirkia acuminata | Kirkiaceae | white seringa | Assessment | U.S. (Florida) | -2 | accept | 
| Koeleria glauca | poaceae | glaucous hairgrass | Assessment | Pacific | 3 | low risk* | 
| Koelreuteria elegans | Sapindaceae | Chinese rain tree | Assessment | Pacific | 8 | high risk | 
| Kopsia arborea | Apocynaceae | rui-mu | Assessment | Pacific | 2 | evaluate | 
| Kopsia fruticosa | Apocynaceae | shrub vinca | Assessment | Pacific | -6 | low risk | 
| Kopsia singapurensis | Apocynaceae | Singpore kopsia | Assessment | Pacific | -4 | low risk | 
| Lablab purpureus | Fabaceae | hyacinth bean | Assessment | Australia | 5 | evaluate | 
| Laccospadix australasica | Aracaceae | Atherton palm | Assessment | Pacific | 1 | evaluate | 
| Lagenaria siceraria | Cucurbitaceae | bottle gourd | Pacific | 0 | low risk | |
| Lagerstroemia indica | Lythraceae | crape myrtle | Assessment | Pacific | 6 | low risk* | 
| Lagerstroemia indica x L. fauriei | Lythraceae | crepe myrtle hybrid | Assessment | Pacific | 4 | low risk* | 
| Lagerstroemia speciosa | Lythraceae | queen's crape myrtle | Pacific | -4 | low risk | |
| Lagerstroemia tomentosa | Lythraceae | leza wood | Assessment | Pacific | -2 | low risk | 
| Lagunaria patersonia | Malvaceae | Norfolk-hibiscus | Assessment | Pacific | 7 | high risk | 
| Lagurus ovatus | Poaceae | hare's tail grass | Assessment | Pacific | 7 | high risk | 
| Lamarckia aurea | Poaceae | goldentop grass | Assessment | Pacific | 11 | high risk | 
| Lamium amplexicaule | Lamiaceae | henbit | Assessment | U.S. (Florida) | 18 | reject | 
| Lansium domesticum | Meliaceae | langsat | Assessment | Pacific | 0 | low risk | 
| Lantana camara | Verbenaceae | lantana | Assessment | Pacific | 32 | high risk | 
| Verbenaceae | trailing lantana | Pacific | 16 | high risk | ||
| Laportea aestuans | Urticaceae | West Indian-nettle | Assessment | Pacific | 10 | high risk | 
| Latania loddigesii | Arecaceae | blue Latan palm | Pacific | -8 | low risk | |
| Laurus nobilis | Lauraceae | bay laurel | Assessment | Pacific | 6 | evaluate | 
| Lavandula dentata | Lamiaceae | French lavender | Assessment | Pacific | 1 | low risk* | 
| Lavandula x intermedia | Lamiaceae | Dutch lavender | Assessment | Pacific | -6 | low risk | 
| Lavatera maritima | Malvaceae | tree mallow | Assessment | Pacific | -6 | low risk | 
| Lawsonia inermis | Lythraceae | henna | Assessment | Pacific | 5 | evaluate | 
| Lebronnecia kokioides | Malvaceae | Assessment | Pacific | -2 | low risk | |
| Lecythis zabucajo | Lecythidaceae | monkeynut | Assessment | Pacific | -4 | low risk | 
| Leea guineensis | Leeaceae | Hawaiian holly | Pacific | -1 | low risk | |
| Leonotis nepetifolia | Lamiaceae | lion's tail | Assessment | Australia | 13 | reject | 
| Leonotis nepetifolia | Lamiaceae | lion's tail | Assessment | Pacific | 19 | high risk | 
| Leonotis nepetifolia | Lamiaceae | lion's tail | Assessment | U.S. (Florida) | 14 | reject | 
| Leonurus japonicus | Lamiaceae | honeyweed | Assessment | Australia | 9 | reject | 
| Lepidium africanum | Brassicaceae | African pepperwort | Assessment | Pacific | 10 | high risk | 
| Lepidium ruderale | Brassicaceae | peppergrass | Assessment | Australia | 16 | reject | 
| Lepidium virginicum | Brassicaceae | Virginia peppeerweed | Assessment | Pacific | 17 | high risk | 
| Leptochloa panicea | Poaceae | red sprangletop | Assessment | Pacific | 12 | high risk | 
| Leptospermum laevigatum | Myrtaceae | Australian teatree | Assessment | Pacific | 11 | high risk | 
| Leptospermum scoparium | Myrtaceae | New Zealand tea | Assessment | Pacific | 20 | high risk | 
| Fabaceae | Chinese lespedeza | Pacific | 17 | high risk | ||
| Lespedeza liukiuensis | Fabaceae | little volcano bush clover | Assessment | U.S. (Florida) | 5 | evaluate | 
| Leucaena leucocephala | Fabaceae | leucaena | Assessment | Australia | 11 | reject | 
| Leucaena leucocephala | Fabaceae | leucaena | Assessment | Pacific | 15 | high risk | 
| Leucaena leucocephala | Fabaceae | leucaena | Assessment | US. | 21 | reject | 
| Leucaena leucocephala | Fabaceae | leucaena | Assessment | U.S. (Florida) | 21 | reject | 
| Leucaena leucocephala cv. 'KX2-Hawaii' | Fabaceae | leucaena | Assessment | Pacific | 3 | evaluate | 
| Leucaena leucocephala cv. 'Wondergraze' | Fabaceae | leucaena | Assessment | Pacific | 7 | high risk | 
| Leucaena leucocephala var. 'Tarramba' | Fabaceae | var. 'Tarramba' | Assessment | Pacific | 10 | high risk | 
| Leucophyllum frutescens | Scrophulariaceae | Texas ranger | Pacific | -3 | low risk | |
| Leucospermum bolusii | Proteaceae | Gordon's Bay pincushion | Assessment | Pacific | -4 | low risk | 
| Leycesteria formosa | Caprifoliaceae | Himalayan honeysuckle | Assessment | Pacific | 18 | high risk | 
| Licania platypus | Chrysobalanaceae | monkey apple | Assessment | Pacific | -1 | low risk | 
| Licuala grandis | Aracaceae | ruffled fan palm | Assessment | Pacific | 6 | evaluate | 
| Ligustrum japonicum | Oleaceae | privet | Assessment | Pacific | 6 | evaluate | 
| Ligustrum lucidum | Oleaceae | glossy privet | Assessment | Australia | 11 | reject | 
| Ligustrum lucidum | Oleaceae | glossy privet | Assessment | Pacific | 6 | evaluate | 
| Ligustrum sinense | Oleaceae | Chinese privet | Assessment | Pacific | 11 | high risk | 
| Linaria dalmatica | Plantaginaceae | Dalmatian toadflax | Assessment | Pacific | 17 | high risk | 
| Linaria purpurea | Plantaginaceae | purple toadflax | Assessment | Pacific | 1 | high risk* | 
| Linum usitatissimum | Linaceae | flax | Assessment | Pacific | 9.5 | high risk | 
| Liriodendron tulipifera | Magnoliaceae | tulip poplar | Assessment | Pacific | 2 | evaluate | 
| Liliaceae | lilyturf | Pacific | 4.5 | low risk* | ||
| Liriope muscari | Liliaceae | lilyturf | Assessment | U.S. (Florida) | 7 | reject | 
| Liriope spicata | Liliaceae | creeping lilyturf | Assessment | Pacific | 7.5 | high risk | 
| Litchi chinensis | Sapindaceae | lychee | Pacific | -6 | low risk | |
| Litchi chinensis | Sapindaceae | lychee | Assessment | U.S. (Florida) | -7 | accept | 
| Livistonia australis | Arecaceae | Australian fan palm | Assessment | Pacific | 3 | evaluate | 
| Livistona chinensis | Arecaceae | Chinese fan palm | Assessment | Pacific | 5 | evaluate | 
| Livistona concinna | Arecaceae | Assessment | U.S. (Florida) | -3 | accept | |
| Livistona rotundifolia | Arecaceae | footstool palm | Pacific | -1 | low risk | |
| Livistona saribus | Arecaceae | taraw palm | Pacific | 6 | evaluate | |
| Lobularia maritma | Brassicaceae | sweet alyssum | Assessment | Pacific | 8 | high risk | 
| Lolium multiflorum | Poaceae | Italian ryegrass | Assessment | Pacific | 9 | high risk | 
| Lomandra longifolia 'tanika' | Laxmanniaceae | fine leaf lomandra | Assessment | Pacific | 1 | low risk* | 
| Lonicera x heckrottii | Caprifoliaceae | goldflame honeysuckle | Pacific | -5 | low risk | |
| Lonicera x heckrottii | Caprifoliaceae | goldflame honeysuckle | Assessment | U.S. (Florida) | -1 | accept | 
| Caprifoliaceae | Japanese honeysuckle | Pacific | 12 | high risk | ||
| Lonicera japonica | Caprifoliaceae | Japanese honeysuckle | Assessment | U.S. (Florida) | 19 | reject | 
| Lophanthera lactescens | Malpighiaceae | golden chain tree | Assessment | Pacific | 0 | low risk | 
| Lophospermum erubescens | Myrtaceae | creeping gloxinia | Assessment | Pacific | 10 | high risk | 
| Lophospermum scandens | Plantaginaceae | twining snapdrago | Assessment | Pacific | -2 | low risk | 
| Lophostemon confertus | Myrtaceae | Brisbane box | Assessment | Pacific | -3 | low risk | 
| Lotus berthelotii | Fabaceae | parrot's beak | Pacific | -1 | low risk | |
| Loxostylis alata | Anacardiaaceae | tiger wood | Assessment | U.S. (Florida) | 0 | accept | 
| Ludwigia peruviana | Onagraceae | Peruvian primrose | Assessment | Australia | 10 | reject | 
| Luma apiculata | Myrtaceae | Chilean myrtle | Assessment | Pacific | 0 | low risk | 
| Lupinus albifrons | Fabaceae | silver lupine | Assessment | Pacific | 5.5 | evaluate | 
| Luzula nivea | Juncaceae | snowy wood rush | Assessment | Pacific | 4 | low risk* | 
| Luzula sylvatica | Juncaceae | greater woodrush | Assessment | Pacific | 7 | high risk | 
| Lycium barbarum | Solanaceae | goji berry, matrimony vine | Assessment | Pacific | 12 | high risk | 
| Lycium chinense | Solanaceae | Chinese wolfberry | Assessment | Pacific | 8 | high risk | 
| Lygodium japonicum | Schizaeaceae | Japanese climbing fern | Assessment | Pacific | 23 | high risk | 
| Lygodium japonicum | Schizaeaceae | Japanese climbing fern | Assessment | U.S. (Florida) | 25 | reject | 
| Lygodium japonicum | Schizaeaceae | Japanese climbing fern | Assessment | United States | moderate to moderate-high | |
| Lygodium microphyllum | Schizaeaceae | Old World climbing fern | Assessment | U.S. (Florida) | 15 | reject | 
| Lygodium microphyllum | Schizaeaceae | Old World climbing fern | Assessment | United States | moderate to moderate-high | |
| Lysiloma latisiliquum | Fabaceae | wild tamarind | Assessment | Pacific | 2 | low risk* | 
| Lysiloma watsonii | Fabaceae | lysiloma | Pacific | -5 | low risk | |
| Lysimachia fortunei | Primulaceae | lysimachia | Assessment | Pacific | 8 | high risk | 
| Macadamia integrifolia | Proteaceae | macadamia | Assessment | Pacific | -1 | low risk | 
| Macaranga mappa | Euphorbiaceae | bingabing | Assessment | Pacific | 11 | high risk | 
| Macaranga tanarius | Euphorbiaceae | parasol leaf tree | Assessment | Pacific | 12 | high risk | 
| Macfadyena unguis-cati | Bignoniaceae | cat's claw climber | Assessment | Pacific | 17 | high risk | 
| Maclura pomifera | Moraceae | osage-orange | Assessment | Pacific | 5 | evaluate | 
| Macroptilium atropurpureum | Fabaceae | siratro | Assessment | Australia | 7 | reject | 
| Macroptilium atropurpureum | Fabaceae | siratro | Assessment | Pacific | 7 | high risk | 
| Macroptilium bracteatum | Fabaceae | burgundy bean | Assessment | Pacific | -1 | low risk | 
| Macroptilium lathyroides | Fabaceae | phasey bean | Assessment | Australia | 6 | reject | 
| Macrotyloma axillare | Fabaceae | perennial horsegram | Assessment | Pacific | 10 | high risk | 
| Maesopsis eminii | Rhamnaceae | umbrella tree | Assessment | Pacific | 8 | high risk | 
| Magnolia grandiflora | Magnoliaceae | southern magnolia | Pacific | 0 | low risk | |
| Majidea zanquebarica | Sapindaceae | black pearl tree | Assessment | Pacific | -3 | low risk | 
| Malpighia glabra | Malpighiaceae | wild crapemyrtle | Assessment | Pacific | -5 | low risk | 
| Malvastrum coromandelianum | Malvaceae | threelobe false mallow | Assessment | U.S. (Florida) | 8 | reject | 
| Malvaceae | Turk's cap | Pacific | -9 | low risk | ||
| Malvaviscus penduliflorus | Malvaceae | mazapan | Assessment | U.S. (Florida) | -5 | accept | 
| Mammea americana | Clusiaceae | mammy-apple | Assessment | Pacific | -1 | low risk | 
| Mandevilla x amabilis | Apocynaceae | pink allamanda hybrid | Pacific | -11 | low risk | |
| Mandevilla boliviensis | Apocynaceae | white mandevilla | Assessment | Pacific | 1 | evaluate | 
| Mandevilla sanderi | Apocynaceae | Shrub displadenia | Assessment | Pacific | -2 | low risk | 
| Mangifera griffithii | Anacardiaceae | Assessment | U.S. (Florida) | -3 | accept | |
| Mangifera indica | Anacardiaceae | mango | Assessment | Pacific | 1 | low risk* | 
| Manicaria saccifera | Arecaceae | royal palm | Assessment | Pacific | -1 | low risk | 
| Manihot esculenta | Euphorbiaceae | cassava | Pacific | 3 | low risk* | |
| Manihot glaziovii | Euphorbiaceae | Ceará rubber tree | Assessment | Pacific | 8 | high risk | 
| Manilkara zapota | Sapotaceae | sapote | Assessment | Pacific | 9 | high risk | 
| Manilkara zapota | Sapotaceae | sapote | Assessment | U.S. (Florida) | 5 | evaluate | 
| Mansoa alliaceum | Bignoniaceae | garlic vine | Pacific | 0 | low risk | |
| Mansoa hymenaea | Bignoniaceae | membranous garlic vine | Pacific | 0 | low risk | |
| Mapania baldwinii | Cyperaceae | Assessment | U.S. (Florida) | -2 | accept | |
| Marrubium vulgare | Lamiaceae | common horehound | Assessment | Australia | 15 | reject | 
| Massularia acuminata | Rubiaceae | Assessment | U.S. (Florida) | -2 | accept | |
| Matisia cordata | Malvaceae | sapote | Assessment | Pacific | -6 | low risk | 
| Maurandella antirrhiniflora | Plantaginaceae | twining foxglove | Assessment | Pacific | 5 | evaluate | 
| Medicago polymorpha | Fabaceae | bur clover | Assessment | U.S. (Florida) | 11 | reject | 
| Medinilla cumingii | Melastomataceae | chandelier tree | Assessment | Pacific | 6 | evaluate | 
| Medinilla heterophylla | Melastomataceae | Assessment | Pacific | 9 | high risk | |
| Melastomataceae | Malaysian orchid | Pacific | 8 | high risk | ||
| Medinilla scortechinii | Melastomataceae | medinilla | Assessment | Pacific | 5 | evaluate | 
| Meehania montis-koyae | Lamiaceae | Meehan's mint | Assessment | U.S. (Florida) | -2 | accept | 
| Megaskepasma erythrochlamys | Acanthaceae | red cloak | Assessment | Pacific | 6 | high risk* | 
| Melaleuca bracteata | Myrtaceae | river tea-tree | Assessment | Pacific | 10 | high risk | 
| Melaleuca diosmifolia | Myrtaceae | green honey-myrtle | Assessment | Pacific | 14 | high risk | 
| Melaleuca incana var. protrata | Myrtaceae | prostrate gray honey myrtle | Assessment | Pacific | 0 | low risk | 
| Melaleuca leucadendra | Myrtaceae | braodleaved paperback | Assessment | Pacific | -1 | low risk | 
| Melaleuca nesophila | Myrtaceae | mauve honey-myrtle | Assessment | Pacific | 8 | high risk | 
| Melaleuca quinquenervia | Myrtaceae | paper bark tree | Assessment | Pacific | 15 | high risk | 
| Melaleuca quinquenervia | Myrtaceae | paper bark tree | Assessment | U.S. (Florida) | 20 | reject | 
| Melaleuca styphelioides | Myrtaceae | prickly-leaf teatree | Assessment | Pacific | -2 | low risk | 
| Melastomataceae | Indian rhododendron | Pacific | 13 | high risk | ||
| Melastoma sanguineum | Melastomataceae | red melastome | Assessment | Pacific | 11 | high risk | 
| Melia azedarach | Meliaceae | Chinaberry | Assessment | Pacific | 14 | high risk | 
| Melica transsilvanica | Poaceae | red spire | Assessment | Pacific | 7 | high risk | 
| Melicoccus bijugatus | Sapindaceae | Spanish lime | Assessment | Pacific | 4 | evaluate | 
| Melicope elleryana | Rutaceae | Saruwa | Assessment | Pacific | 4 | evaluate | 
| Melinis minutiflora | Poaceae | molasses grass | Assessment | Australia | 7 | reject | 
| Melinis minutiflora | Poaceae | molasses grass | Assessment | Pacific | 18 | high risk | 
| Melinis nerviglumis | Poaceae | pink chrystals | Assessment | Pacific | 7 | high risk | 
| Melochia corchorifolia | Sterculiaceae | redweed | Assessment | U.S. (Florida) | 10 | reject | 
| Melochia umbellata | Sterculiaceae | melochia | Assessment | Pacific | 7 | high risk | 
| Merremia peltata | Convolvulaceae | merremia | Assessment | Pacific | 18 | high risk | 
| Merremia quinquefolia | Convolvulaceae | rock rosemary | Assessment | U.S. (Florida) | 8 | reject | 
| Merremia tuberosa | Convolvulaceae | wood rose | Assessment | Pacific | 12 | high risk | 
| Mesua ferrea | Calophyllaceae | Ceylon iron wood | Assessment | Pacific | -1 | low risk | 
| Metrosideros collina | Myrtaceae | vunga | Assessment | Pacific | 3 | evaluate | 
| Metrosideros excelsa | Myrtaceae | New Zealand christmas tree | Assessment | Pacific | 6.5 | high risk | 
| Metrosideros kermadecensis | Myrtaceae | Kermadec pohutukawa | Assessment | Pacific | 3 | evaluate | 
| Metroxylon amicarum | Arecaceae | Caroline ivory nut palm | Pacific | 0 | low risk | |
| Michelia x alba | Magnoliaceae | white champaca | Pacific | -6 | low risk | |
| Michelia champaca | Magnoliaceae | orange champaca | Pacific | -5 | low risk | |
| Michelia figo | Magnoliaceae | banana shrub | Pacific | -5 | low risk | |
| Miconia calvescens | Melastomataceae | miconia | Assessment | Pacific | 14 | high risk | 
| Microsorum musifolium | Polypodiaceae | crocodile fern | Assessment | Pacific | 5 | low risk* | 
| Mikania micrantha | Asteraeae | mile-a-minute weed | Assessment | Pacific | 25 | high risk | 
| Mimosa diplotricha | Fabaceae | giant sensitive plant | Assessment | Australia | 16 | reject | 
| Mimosa diplotricha | Fabaceae | giant sensitive plant | Assessment | Pacific | 24 | high risk | 
| Mimosa pigra | Fabaceae | catclaw mimosa | Assessment | Australia | 23 | reject | 
| Mimosa pigra | Fabaceae | catclaw mimosa | Assessment | Pacific | 25 | high risk | 
| Mimosa pigra | Fabaceae | catclaw mimosa | Assessment | U.S. (Florida) | 27 | reject | 
| Mimosa pudica | Fabaceae | sensitive plant | Assessment | Australia | 18 | reject | 
| Mimosa pudica | Fabaceae | sensitive plant | Assessment | U.S. (Florida) | 17 | reject | 
| Mimosa tenuiflora | Fabaceae | jurema | Assessment | Pacific | 7 | high risk | 
| Mimusops caffra | Sapotaceae | coastal red milkwood | Assessment | Pacific | 2 | evaluate | 
| Minquartia guianensis | Olacaceae | black manwood | Assessment | Pacific | -1 | low risk | 
| Mirabilis jalapa | Nyctaginaceae | marvel of Peru | Assessment | Pacific | 15 | high risk | 
| Miscanthus floridulus | Poaceae | giant miscanthus | Pacific | 18 | high risk** | |
| Miscanthus x giganteus | Poaceae | Assessment | U.S. | -9 | accept | |
| Miscanthus x giganteus | Poaceae | Assessment | U.S. (Florida) | -8 | accept | |
| Miscanthus sinensis | Poaceae | Chinese silver grass | Assessment | U.S. (Florida) | 14 | reject | 
| Mitragyna speciosa | Rubiaceae | kratom | Assessment | Pacific | 0 | low risk | 
| Mollugo verticillata | Molluginaceae | carpetweed | Assessment | U.S. (Florida) | 8 | reject | 
| Momordica charantia | Cucurbitaceae | bitter melon | Assessment | Pacific | 13 | high risk | 
| Momordica charantia | Cucurbitaceae | balsam pear | Assessment | U.S. (Florida) | 14 | reject | 
| Monodora junodii | Annonaceae | green apple | Assessment | Pacific | -5 | low risk | 
| Monstera deliciosa | Araceae | swiss-cheese plant | Pacific | 1 | low risk* | |
| Montanoa hibiscifolia | Asteraceae | tree daisy | Assessment | Pacific | 13 | high risk | 
| Morella cerifera | Myricaceae | wax myrtle | Assessment | Pacific | 20 | high risk | 
| Morella faya | Myricaceae | fayatree | Assessment | Pacific | 17 | high risk | 
| Morinda citrifolia | Rubiaceae | noni | Assessment | Pacific | 10 | high risk** | 
| Moringa oleifera | Moringaceae | horseradish tree | Assessment | Pacific | 1 | low risk* | 
| Mucuna bennettii | Fabaceae | New Guinea creeper | Assessment | Pacific | 2 | low risk* | 
| Mucuna bracteata | Fabaceae | Assessment | Pacific | 6 | evaluate | |
| Mucuna pruriens | Fabaceae | cow itch | Assessment | Pacific | 7 | high risk | 
| Muehlenbeckia platyclada | Polygonaceae | centipede plant | Assessment | Pacific | 6 | evaluate | 
| Muhlenbergia capillaris | Poaceae | hairawn muhly | Assessment | Pacific | 5 | evaluate | 
| Muhlenbergia rigens | Poaceae | deer grass | Assessment | Pacific | 7 | high risk | 
| Muntingia calabura | Flacourtiaceae | Jamaican cherry | Assessment | Pacific | 12 | high risk | 
| Murraya paniculata | Rutaceae | orange jessamine | Assessment | Pacific | 6 | evaluate | 
| Murraya paniculata | Rutaceae | orange jessamine | Assessment | U.S. (Florida) | 7 | reject | 
| Musa acuminata | Musaceae | Cavendish banana | Pacific | -11 | low risk | |
| Musa balbisiana | Musaceae | Japanese fiber banana | Assessment | Pacific | -2 | low risk | 
| Musa sikkimensis | Musaceae | Darjeeling banana | Assessment | U.S. (Florida) | 0 | accept | 
| Muscari tenuiflorum | Hyacinthaceae | Assessment | U.S. (Florida) | 5 | accept* | |
| Mussaenda 'Dona Aurora' | Rubiaceae | Mussaenda 'Dona Aurora' | Assessment | Pacific | -9 | low risk | 
| Mussaenda 'Dona Luz' | Rubiaceae | Mussaenda 'Dona Luz' | Assessment | Pacific | -5 | low risk | 
| Mussaenda 'Dona Trining' | Rubiaceae | Mussaenda 'Dona Trining' | Assessment | Pacific | -1 | low risk | 
| Mussaenda erythrophylla | Rubiaceae | red mussaenda | Pacific | 0 | low risk | |
| Mussaenda frondosa | Rubiaceae | flag bush | Pacific | -4 | low risk | |
| Mussaenda philippica | Rubiaceae | white mussaenda | Pacific | -3 | low risk | |
| Myoporum laetum | Myoporaceae | ngaio | Assessment | Pacific | 6 | evaluate | 
| Myrcia dichasialis | Myrtaceae | Assessment | U.S. (Florida) | -2 | accept | |
| Myrcianthes fragrans | Myrtaceae | Simpson stopper | Assessment | Pacific | 0 | low risk | 
| Myrciaria cauliflora | Myrtaceae | jaboticaba | Assessment | Pacific | -2 | low risk | 
| Myriophyllum aquaticum | Haloragaceae | Brazilian water milfoil | Assessment | Australia | 20 | reject | 
| Myriophyllum aquaticum | Haloragaceae | Brazilian water milfoil | Assessment | Pacific | 22 | high risk | 
| Myriophyllum spicatum | Haloragaceae | Eurasian water-milfoil | Assessment | U.S. (Florida) | 25 | reject | 
| Myristica fragrans | Myristicaceae | nutmeg tree | Assessment | Pacific | -1 | low risk | 
| Myroxylon balsamum | Fabaceae | balsam of Tolu | Assessment | Pacific | 7 | high risk | 
| Myristica fragrans | Myristicaceae | nutmeg tree | Assessment | Pacific | -1 | low risk | 
| Myrtus communis | Myrtaceae | myrtle | Assessment | U.S. (Florida) | 4 | evaluate | 
| Nandina domestica | Berberidaceae | nandina | Assessment | Pacific | 9 | high risk | 
| Nandina domestica | Berberidaceae | nandina | Assessment | U.S. (Florida) | 12 | reject | 
| Nassella tenuissima | Poaceae | Mexican feather grass | Assessment | Australia (Queensland) | potential serious pest | |
| Nassella tenuissima | Poaceae | Mexican feather grass | Assessment | Pacific | 24 | high risk | 
| Nastus elatus | Poaceae | New Guinea edible bamboo | Assessment | Pacific | 2 | low risk* | 
| Neoharmsia baronii | Fabaceae | manangona | Assessment | Pacific | -4 | low risk | 
| Neonotonia wightii | Fabaceae | glycine | Assessment | Australia | 7 | more information | 
| Neonotonia wightii | Fabaceae | glycine | Assessment | Pacific | 7 | high risk | 
| Nephelium lappaceum | Sapindaceae | rambutan | Assessment | Pacific | -5 | low risk | 
| Nephrolepis biserrata | Dryopteridaceae | giant sword fern | Assessment | Pacific | 13 | high risk** | 
| Nephrolepis cordifolia | Dryopteridaceae | sword fern | Assessment | U.S. (Florida) | 11 | reject** | 
| Nerium oleander | Apocynaceae | oleander | Assessment | Pacific | 6 | evaluate | 
| Neyraudia reynaudiana | Poaceae | Burma reed | Assessment | U.S. (Florida) | 11 | reject | 
| Nicotiana glauca | Solanaceae | tree tobacco | Assessment | Pacific | 15 | high risk | 
| Nicotiana tabacum | Solanaceae | tobacco | Assessment | Pacific | 9 | high risk | 
| Nolina recurvata | Agavaceae | ponytail palm | Pacific | -4 | low risk | |
| Nopalea cochenillifera | Cactaceae | Cochineal cactus | Assessment | Pacific | 7 | high risk | 
| Norantea guianensis | Marcgraviaceae | red hot poker vine | Assessment | Pacific | 7 | high risk | 
| Normanbaya normanbyi | Arecaceae | black palm | Assessment | Pacific | -1 | low risk | 
| Noronhia emarginata | Oleaceae | Madagascar olive | Assessment | Pacific | 5 | low risk | 
| Nymphaea capensis | Nymphaeaceae | Cape water-lily | Assessment | Pacific | 12 | high risk | 
| Nypa fruticans | Arecaceae | nipa palm | Assessment | Pacific | 9 | high risk | 
| Ochna integerrima | Ochnaceae | Vietnamese Mickey Mouse plant | Assessment | Pacific | 1 | evaluate | 
| Ochna serrulata | Ochnaceae | Mickey Mouse plant | Assessment | Pacific | 11 | high risk | 
| Ochna thomasiana | Ochnaceae | Mickey Mouse bush | Assessment | Pacific | 8 | high risk | 
| Ochroma pyramidale | Malvaceae | balsa | Assessment | Pacific | 8 | high risk | 
| Ochrosia elliptica | Apocynaceae | elliptic yellowwood | Assessment | Pacific | 2 | evaluate | 
| Ocotea meziana | Lauraceae | Assessment | U.S. (Florida) | -4 | accept | |
| Odontonema cuspidatum | Acanthaceae | fire spike | Assessment | Pacific | 7 | high risk | 
| Odontonema tubaeforme | Acanthaceae | fire spike | Assessment | Pacific | 11 | high risk | 
| Oenocarpus bataua | Arecaceae | bataua palm | Assessment | Pacific | 2 | evaluate | 
| Olea europaea | Oleaceae | olive | Assessment | Australia | 2 | evaluate | 
| Olea europaea ssp. cuspidata | Oleaceae | wild olive | Assessment | Pacific | 11 | high risk | 
| Olea europaea ssp. europaea | Oleaceae | olive | Assessment | Pacific | 5 | evaluate | 
| Oncosperma tigillarium | Arecaceae | nibong | Assessment | Pacific | 8 | high risk | 
| Onopordum acaulon | Asteraceae | stemless thistle | Assessment | United States | medium-high | |
| Onopordum illyricum | Asteraceae | Illyrian Thistle | Assessment | United States | medium-high | |
| Ophiopogon japonicus | Liliaceae | mondo grass | Pacific | 3 | low risk* | |
| Opuntia aurantiaca | Cactaceae | tiger pear | Assessment | Australia | 22 | reject | 
| Opuntia fulgida | Cactaceae | jumping cholla | Assessment | Pacific | 16 | high risk | 
| Opuntia robusta | Cactaceae | wheel cactus | Assessment | Australia | 20 | reject | 
| Opuntia monacanta | Cactaceae | prickly pear | Assessment | Australia | 20 | reject | 
| Opuntia stricta | Cactaceae | erect prickly-pear | Assessment | Australia | 20 | reject | 
| Ormosia monosperma | Fabaceae | necklace tree | Assessment | Pacific | 1 | evaluate | 
| Ornithogalum kochii | Hyacinthaceae | Star of Bethlehem | Assessment | U.S. (Florida) | 2 | accept* | 
| Osa pulchra | Rubiaceae | osa | Assessment | Pacific | -3 | low risk | 
| Osmoxylon lineare | Araliaceae | osmoxylon | Assessment | Pacific | 3 | evaluate | 
| Osteospermum fruticosum | Asteraceae | trailing African daisy | Assessment | Pacific | 3 | low risk* | 
| Otacanthus caeruleus | Scrophulariaceae | Brazilian snapdragon | Pacific | -4 | low risk | |
| Otatea aztecorum | Poaceae | Mexican weeping bamboo | Assessment | Pacific | 4 | low risk* | 
| Oxalis barrelieri | Oxalidaceae | lavender sorrel | Assessment | Pacific | 13 | high risk | 
| Oxera pulchella | Verbenaceae | royal vine | Assessment | Pacific | -1 | low risk | 
| Pachira aquatica | Bombaceae | Malabar chestnut | Assessment | Pacific | -6 | low risk | 
| Pachypodium lamerei | Apocynaceae | Madagascar palm | Assessment | Pacific | 1 | low risk* | 
| Pachystachys lutea | Acanthaceae | yellow shrimp plant | Assessment | Pacific | -4 | low risk | 
| Paederia cruddasiana | Rubiaceae | sewervine | Assessment | U.S. (Florida) | 2 | evaluate | 
| Rubiaceae | maile pilau | Pacific | 21 | high risk | ||
| Paederia foetida | Rubiaceae | skunk vine | Assessment | U.S. (Florida) | 19 | reject | 
| Pandanus pygmaeus | Pandanaceae | small screwpine | Assessment | Pacific | 0 | low risk | 
| Pandorea jasminoides | Bignoniaceae | jasmin pandorea | Assessment | Pacific | 0 | low risk | 
| Panicum maximum | Poaceae | Guinea grass | Assessment | Pacific | 17 | high risk | 
| Panicum maximum var. jacq | Poaceae | Guinea grass | Assessment | Australia | 6 | reject | 
| Panicum maximum var. trichoglume | Poaceae | Guinea grass | Assessment | Australia | 16 | reject | 
| Panicum repens | Poaceae | torpedo grass | Assessment | Australia | 9 | more information | 
| Panicum virgatum | Poaceae | switchgrass | Assessment | Pacific | 11 | high risk | 
| Papaver oreophilum | Papaveraceae | Assessment | U.S. (Florida) | 2 | accept* | |
| Pararchidendron pruinosum | Fabaceae | snowwood | Assessment | Pacific | 1 | evaluate | 
| Paraserianthes lophantha | Fabaceae | mountain albizia | Assessment | Pacific | 10.5 | high risk | 
| Parkia speciosa | Fabaceae | petai | Assessment | Pacific | 1 | evaluate | 
| Parkinsonia aculeata | Fabaceae | parkinsonia | Assessment | Australia | 15 | reject | 
| Parkinsonia aculeata | Fabaceae | parkinsonia | Assessment | Pacific | 20 | high risk | 
| Parkinsonia aculeata | Fabaceae | parkinsonia | Assessment | U.S. (Florida) | 18 | reject | 
| Parmentiera aculeata | Bignoniaceae | cucumber tree | Assessment | Pacific | 9 | high risk | 
| Parmentiera cereifera | Bignoniaceae | candle tree | Assessment | Pacific | -1 | low risk | 
| Parthenium hysterophorus | Asteraceae | parthenium weed | Assessment | Australia | 18 | reject | 
| Paspalum conjugatum | Poaceae | T grass | Assessment | Pacific | 28 | high risk | 
| Paspalum dilatatum | Poaceae | dallis grass | Assessment | Australia | 9 | reject | 
| Paspalum dilatatum | Poaceae | dallis grass | Assessment | Pacific | 12 | high risk | 
| Paspalum notatum | Poaceae | Bahia grass | Assessment | Pacific | 16 | high risk | 
| Paspalum paniculatum | Poaceae | Russell river grass | Assessment | Australia | 9 | reject | 
| Paspalum urvillei | Poaceae | Vasey grass | Assessment | U.S. (Florida) | 13 | reject | 
| Poaceae | seashore paspalum | Pacific | 7 | high risk | ||
| Passiflora biflora | Passifloraceae | twin-flowered passion vine | Assessment | U.S. (Florida) | 5 | accept | 
| Passiflora coriacea | Passifloraceae | bat-leafed passion flower | Assessment | U.S. (Florida) | 2 | evaluate | 
| Passiflora edulis | Passifloraceae | purple granadilla | Assessment | Pacific | 6 | low risk* | 
| Passiflora foetida | Passifloraceae | stinking passionflower | Assessment | Pacific | 26 | high risk | 
| Passiflora incarnata | Passifloraceae | maypop passionflower | Assessment | Australia | 8 | reject | 
| Passiflora mexicana | Passifloraceae | Mexican passiflora | Assessment | Pacific | 4 | evaluate | 
| Passiflora quadrangularis | Passifloraceae | giant granadilla | Assessment | Pacific | 11 | high risk | 
| Passiflora rubra | Passifloraceae | red passionfruit | Assessment | Pacific | 9 | high risk | 
| Passiflora suberosa | Passifloraceae | corky passionflower | Assessment | Pacific | 12 | high risk | 
| Passiflora tarminiana | Passifloraceae | banana poka | Assessment | Pacific | 24 | high risk | 
| Passifloraceae | crimson passion flower | Pacific | 11 | high risk | ||
| Paulownia elongata | Scrophulariaceae | paulownia | Assessment | Pacific | -1 | low risk | 
| Paulownia fortunei | Scrophulariaceae | empress diamond | Pacific | 1 | low risk* | |
| Paulownia kawakamii | Scrophulariaceae | kawakami paulownia | Assessment | Pacific | - | low risk | 
| Paulownia tomentosa | Scrophulariaceae | paulownia | Assessment | Australia | 7 | reject | 
| Paulownia tomentosa | Scrophulariaceae | paulownia | Assessment | Pacific | 9 | high risk | 
| Pavonia dasypetala | Malvaceae | pavonia | Assessment | U.S. (Florida) | -2 | accept | 
| Pedilanthus tithymaloides | Euphorbiaceae | milkbush | Assessment | Pacific | 7 | high risk | 
| Pelargonium peltatum | Geraniaceae | ivyleaf geranium | Pacific | 0 | low risk | |
| Pellionia repens | Urticaceae | trailing watermelon begonia | Assessment | Pacific | -2 | low risk | 
| Peltogyne purpurea | Fabaceae | purpleheart | Assessment | Pacific | -2 | low risk | 
| Peltophorum pterocarpum | Fabaceae | yellow flame tree | Assessment | Pacific | -4 | low risk | 
| Pennisetum clandestinum | Poaceae | kikuyu grass | Assessment | Australia | 12 | reject | 
| Pennisetum clandestinum | Poaceae | kikuyu grass | Assessment | Pacific | 18 | high risk | 
| Pennisetum glaucum | Poaceae | pearl millet | Assessment | Pacific | 12 | high risk | 
| Pennisetum glaucum var. 'purple majesty' | Poaceae | ornamental pearl millet | Assessment | Pacific | 3 | low risk* | 
| Pennisetum macrourum | Poaceae | African feathergrass | Assessment | Australia | 26 | reject | 
| Pennisetum petiolare | Poaceae | petioled fountaingrass | Assessment | Pacific | 7 | high risk | 
| Pennisetum polystachion | Poaceae | mission grass | Assessment | Australia | 11 | reject | 
| Pennisetum purpureum | Poaceae | elephant grass | Assessment | Australia | 10 | reject | 
| Pennisetum purpureum | Poaceae | elephant grass | Assessment | Pacific | 16 | high risk | 
| Pennisetum purpureum | Poaceae | elephant grass | Assessment | U.S. | 18 | reject | 
| Pennisetum purpureum | Poaceae | elephant grass | Assessment | U.S. (Florida) | 18 | reject | 
| Poaceae | fountain grass | Pacific | 26 | high risk | ||
| Pennisetum setaceum | Poaceae | fountain grass | Assessment | U.S. (Florida) | 20 | reject | 
| Pennisetum villosum | Poaceae | feathertop | Assessment | Pacific | 24 | high risk | 
| Apocynaceae | wild allamanda | Pacific | 9 | high risk | ||
| Pentas lanceolata | Rubiaceae | Egyptian star cluster | Assessment | Pacific | 5 | evaluate | 
| Peperomia obtusifolia | Piperaceae | baby rubberplant | Pacific | -4 | low risk | |
| Pereskia aculeata | Cactaceae | Barbados gooseberry | Assessment | Pacific | 13 | high risk | 
| Pereskia bleo | Cactaceae | wax rose | Assessment | Pacific | 0 | low risk | 
| Pereskia grandifolia | Cactaceae | rose cactus | Assessment | Pacific | 0 | low risk | 
| Pereskia lychnidiflora | Cactaceae | arbol del matrimonio | Assessment | Pacific | -1 | low risk | 
| Persea americana | Lauraceae | avocado | Assessment | Pacific | 3 | low risk* | 
| Persicaria capitata | Polygonaceae | pink knotweed | Assessment | Pacific | 13 | high risk | 
| Persicaria chinensis | Polygonaceae | Chinese knotweed | Assessment | Pacific | 14 | high risk | 
| Persicaria microcephala | Polygonaceae | fleeceflower | Assessment | U.S. (Florida) | 0 | accept | 
| Persicaria tectoria | Polygonaceae | Chinese indigo | Assessment | Pacific | 4 | low risk* | 
| Petrea volubilis | Verbenaceae | sandpaper vine | Pacific | -1 | low risk | |
| Petroselinum crispum | Apiaceae | parsley | Assessment | Pacific | -1 | low risk | 
| Phacelia tanacetifolia | Boraginaceae | phacelia | Assessment | Pacific | 5 | evaluate | 
| Philadelphus karwinskyanus | Hydrangeaceae | evergreen mock orange | Assessment | Pacific | 7 | high risk | 
| Philodendron scandens | Araceae | heart-leaf philodendron | Pacific | -3 | low risk | |
| Philodendron scandens | Araceae | heart-leaf philodendron | Assessment | U.S. (Florida) | 0 | accept | 
| Phoenix canariensis | Arecaceae | Canary Island palm | Assessment | Pacific | 17 | high risk | 
| Phoenix dactylifera | Arecaceae | date palm | Assessment | Pacific | 10 | high risk | 
| Phoenix reclinata | Arecaceae | Senegal date palm | Assessment | U.S. (Florida) | 5 | evaluate | 
| Phoenix roebelenii | Arecaceae | pygmy date palm | Pacific | -5 | low risk | |
| Phoenix roebelenii | Arecaceae | pygmy date palm | Assessment | U.S. (Florida) | 5 | evaluate | 
| Phormium tenax | Agavaceae | New Zealand flax | Assessment | Pacific | 8 | high risk | 
| Photinia davidiana | Rosaceae | photinia | Assessment | Pacific | -2 | low risk | 
| Phyla nodiflora | Verbenaceae | matchweed | Assessment | Pacific | 5 | high risk* | 
| Phyllanthus acidus | Euphorbiaceae | gooseberry-tree | Assessment | Pacific | 4 | low risk* | 
| Phyllanthus reticulatus | Euphorbiaceae | potato bush | Assessment | Pacific | 12 | high risk | 
| Phyllanthus urinaria | Euphorbiaceae | common leafflower | Assessment | Australia | 12 | reject | 
| Phyllanthus urinaria | Euphorbiaceae | chamberbitter | Assessment | U.S. (Florida) | 13 | reject | 
| Phyllostachys aurea | Poaceae | golden bamboo | Assessment | Pacific | 9 | high risk | 
| Phyllostachys nigra | Poaceae | black bamboo | Assessment | Pacific | 12 | high risk | 
| Phymatosorus scolopendria | Polypodiaceae | monarch fern | Assessment | Pacific | 6 | evaluate** | 
| Phytolacca dioica | Phytolaccaeae | ombu | Assessment | Pacific | 9 | high risk | 
| Picea engelmannii | Pinaceae | Engelmann spruce | Assessment | Pacific | -0.5 | low risk | 
| Picea pungens | Pinaceae | Colorado blue spruce | Assessment | Pacific | 1 | evaluate | 
| Pilea cadierei | Urticaceae | aluminum plant | Assessment | Pacific | -5 | low risk | 
| Pilea hyalina | Urticaceae | virdrillo | Assessment | Pacific | 8 | high risk | 
| Pilea microphylla | Urticaceae | artillery plant | Assessment | Pacific | 6 | evaluate | 
| Pilea nummulariifolia | Urticaceae | creeping Charlie | Assessment | Pacific | 0 | low risk | 
| Pilea nummulariifolia | Urticaceae | creeping Charlie | Assessment | U.S. (Florida) | 11 | reject | 
| Pimenta dioica | Myrtaceae | pimento | Assessment | Pacific | 7 | high risk | 
| Pimenta racemosa | Myrtaceae | bay tree | Assessment | Pacific | 7 | high risk | 
| Pinanga coronata | Arecaceae | ivory cane palm | Assessment | Pacific | 2 | evaluate | 
| Pinellia peltata | Araceae | Assessment | U.S. (Florida) | 3 | accept* | |
| Pinus elliottii | Pinaceae | slash pine | Assessment | Pacific | 2 | evaluate | 
| Pinus nigra | Pinaceae | black pine | Assessment | Pacific | 7 | high risk | 
| Pinaceae | Monterey pine | Pacific | 5 | evaluate | ||
| Pinus strobus | Pinaceae | white pine | Assessment | Pacific | 9 | high risk | 
| Pinus taeda | Pinaceae | loblolly pine | Assessment | Pacific | 7 | high risk | 
| Pinus thunbergii | Pinaceae | Japanese black pine | Assessment | Pacific | 8 | high risk | 
| Piper aduncum | Piperaceae | spiked pepper | Assessment | Pacific | 18 | high risk | 
| Piper auritum | Piperaceae | eared pepper | Assessment | Pacific | 10 | high risk | 
| Piper methysticum | Piperaceae | kava | Assessment | Pacific | -4 | low risk* | 
| Piptatherum miliaceum | Poaceae | rice millet | Assessment | Pacific | 7 | high risk | 
| Pistacia chinensis | Anacardiaceae | Chinese pistachio | Assessment | U.S. (Florida) | 1 | evaluate | 
| Pistia stratiotes | Araceae | tropical duckweed | Assessment | Australia | 18 | reject | 
| Pitcairnia karwinskyana | Bromeliaceae | Assessment | U.S. (Florida) | -3 | accept | |
| Fabaceae | Madras thorn | Pacific | 14 | high risk | ||
| Pittosporum resiniferum | Pittosporaceae | petroleum nut | Assessment | Pacific | 6 | evaluate | 
| Pittosporum rubiginosum | Pittosporaceae | hairy red pittosporum | Assessment | U.S. (Florida) | -3 | accept | 
| Pittosporum tobira | Pittosporaceae | Japanese cheesewood | Assessment | Pacific | 3.5 | evaluate | 
| Pittosporum undulatum | Pittosporaceae | Victorian box | Assessment | Pacific | 10 | high risk | 
| Pittosporum viridiflorum | Pittosporaceae | cape cheesewood | Assessment | Pacific | 7 | high risk | 
| Pityrogramma calomelanos | Pteridaceae | silverback fern | Assessment | U.S. (Florida) | 12 | reject | 
| Platycladus orientalis | Cupressaceae | oriental arborvitae | Pacific | -6 | low risk | |
| Plectranthus neochilus | Lamiaceae | spur flower | Assessment | Pacific | 7 | high risk | 
| Plectranthus prostratus | Lamiaceae | pillow plant | Assessment | Pacific | 5 | low risk* | 
| Pleiostachya pruinosa | Marantaceae | prayer plant | Assessment | Pacific | 2 | low risk* | 
| Plinia edulis | Myrtaceae | Cambucá | Assessment | Pacific | -3 | low risk | 
| Pluchea carolinensis | Asteraceae | sourbush | Assessment | Pacific | 15 | high risk | 
| Pluchea indica | Asteraceae | Indian fleabane | Assessment | Pacific | 11 | high risk | 
| Plumbago auriculata | Plumbaginaceae | cape leadwort | Pacific | 6 | low risk* | |
| Plumeria obtusa | Apocynaceae | evergreen frangipani | Assessment | Pacific | -6 | low risk | 
| Plumeria pudica | Apocynaceae | fiddle-leaf plumeria | Assessment | Pacific | -4 | low risk | 
| Plumeria rubra | Apocynaceae | frangipani | Pacific | -5 | low risk | |
| Poa annua | Poaceae | annual bluegrass | Assessment | U.S. (Florida) | 26 | reject | 
| Poa pratensis | Poaceae | Kentucky bluegrass | Assessment | Pacific | 14 | high risk | 
| Poa pratensis | Poaceae | Kentucky bluegrass | Assessment | United States | high risk | |
| Podocarpus chinensis | Podocarpaceae | maki | Assessment | Pacific | -4 | low risk | 
| Podocarpus elatus | Podocarpaceae | plum pine | Pacific | -2 | low risk | |
| Podocarpus gracilior | Podocarpaceae | African fern pine | Pacific | 0 | low risk | |
| Podocarpus henkelii | Podocarpaceae | Henkel's yellow wood | Assessment | Pacific | 2 | evaluate | 
| Podocarpus macrophyllus | Podocarpaceae | Japanese yes | Pacific | -3 | low risk | |
| Podranea ricasoliana | Bignoniaceae | pink trumpet vine | Assessment | Pacific | 7 | high risk | 
| Polyalthia longifolia var. pendula | Annonaceae | mast tree | Assessment | Pacific | -4 | low risk | 
| Polygonatum kingianum | Asparagaceae | Assessment | U.S. (Florida) | 1 | accept* | |
| Polypogon monspeliensis | Poaceae | rabbitfoot grass | Assessment | Pacific | 18 | high risk | 
| Polyscias cumingiana | Araliaceae | fern-leaf aralia | Assessment | Pacific | 3 | evaluate | 
| Polyscias fruticosa | Arailiaceae | Ming Aralia | Pacific | -1 | low risk | |
| Polyscias guilfoylei | Arailiaceae | coffeetree | Assessment | Pacific | 0 | low risk | 
| Polyscias nodosa | Arailiaceae | dog-bone tree | Assessment | Pacific | 0 | low risk | 
| Pongamia pinnata | Fabaceae | Indian beech | Pacific | 7 | high risk** | |
| Poranopsis paniculata | Convolvulaceae | bridal bouquet | Pacific | -5 | low risk | |
| Portlandia grandiflora | Rubiaceae | bellflower | Assessment | Pacific | -4 | low risk | 
| Portulaca grandiflora | Portulacaceae | moss-rose | Assessment | Pacific | 9 | high risk | 
| Portulaca oleracea | Portulacaceae | common purslane | Assessment | U.S. (Florida) | 23 | reject | 
| Portulacaria afra | Didiereaceae | Dwarf Jade Plant | Assessment | Pacific | 5 | evaluate | 
| Posoqueria latifolia | Rubiaceae | monkey apple | Pacific | -2 | low risk | |
| Potentilla verna | Rosaceae | spring cinquefoil | Pacific | -2 | low risk | |
| Pouteria caimito | Sapotaceae | caimito | Assessment | Pacific | -4 | low risk | 
| Pouteria campechiana | Sapotaceae | yellow sapote | Assessment | Pacific | -3 | low risk | 
| Pouteria lucuma | Sapotaceae | lucmo | Assessment | Pacific | -1 | low risk | 
| Pouteria sapota | Sapotaceae | mamey sapote | Assessment | Pacific | -3 | low risk | 
| Pouteria sapota | Sapotaceae | mamey sapote | Assessment | U.S. (Florida) | -3 | accept | 
| Praxelis clematidea | Asteraceae | praxelis | Assessment | Pacific | 25 | high risk | 
| Premna odorata | Verbenaceae | alagau | Assessment | Pacific | -1 | low risk | 
| Pritchardia pacifica | Arecaceae | Fiji fan palm | Pacific | -4 | low risk | |
| Pritchardia thurstonii | Arecaceae | Thurston's fan palm | Assessment | Pacific | -4 | low risk | 
| Prosopis glandulosa | Fabaceae | honey mesquite | Assessment | Pacific | 19 | high risk | 
| Fabaceae | thorny kiawe | Pacific | 19 | high risk | ||
| Prosopis pallida | Fabaceae | mesquite | Assessment | Australia | 20 | reject | 
| Protium glabrum | Burseraceae | Assessment | U.S. (Florida) | -4 | accept | |
| Prunus cerasifera | Rosaceae | cherry plum | Assessment | Pacific | 8 | high risk | 
| Prunus grisea | Rosaceae | amongyang | Assessment | Pacific | 2 | evaluate | 
| Pseuderanthemum carruthersii | Acanthaceae | false eranthemum | Assessment | Pacific | 1 | low risk* | 
| Pseuderanthemum graciliflorum | Acanthaceae | blue crossandra | Assessment | Pacific | 1 | low risk* | 
| Pseudobombax ellipticum | Bombacaceae | shavingbrush tree | Pacific | -2 | low risk | |
| Pseudodracontium harmandii | Araceae | Assessment | U.S. (Florida) | 0 | accept | |
| Pseudogynoxys chenopodioides | Asteraceae | Mexican flame vine | Assessment | Pacific | 7 | high risk | 
| Pseudomussaenda flava | Rubiaceae | dwarf yellow mussaenda | Pacific | -6 | low risk | |
| Pseudosamanea guachapele | Fabaceae | chime tree | Assessment | Pacific | 0 | low risk | 
| Pseudotsuga menziesii | Pinace | Douglas-fir | Assessment | Pacific | 5.5 | evaluate | 
| Psidium cattleianum | Myrtaceae | strawberry guava | Assessment | Pacific | 18 | high risk | 
| Psidium guajava | Myrtaceae | guava | Assessment | Pacific | 21 | high risk | 
| Psidium guineense | Myrtaceae | Guinea guava | Assessment | Pacific | 7 | high risk | 
| Psychotria carthagenensis | Rubiaceae | cafecillo | Assessment | Pacific | 2 | high risk* | 
| Psychotria chiapensis | Rubiaceae | Assessment | U.S. (Florida) | -5 | accept | |
| Psychotria viridis | Rubiaceae | chacruna | Assessment | Pacific | 0 | low risk | 
| Pteris multifida | Pteridaceae | spider brake | Assessment | U.S. (Florida) | 9 | reject | 
| Pterocarpus dalbergioides | Fabaceae | Andaman redwood | Pacific | -3 | low risk | |
| Fabaceae | Burmese rosewood | Pacific | 4 | evaluate | ||
| Pterocarpus rohrii | Fabaceae | bloodwood | Assessment | Pacific | 0 | low risk | 
| Pterolepis glomerata | Melastomataceae | false meadow beauty | Assessment | Pacific | 11 | high risk | 
| Ptychosperma elegans | Arecaceae | Alexander palm | Assessment | Pacific | 2 | evaluate | 
| Ptychosperma macarthurii | Arecaceae | Macarthur palm | Assessment | Pacific | 1 | high risk* | 
| Pueraria montana var. lobata | Fabaceae | kudzu | Assessment | Australia | 9 | reject | 
| Pueraria montana var. lobata | Fabaceae | kudzu | Analysis Report | Europe | prohibit introduction | |
| Pueraria montana var. lobata | Fabaceae | kudzu | Assessment | Pacific | 24 | high risk | 
| Pueraria phaseoloides | Fabaceae | tropical kudzu | Assessment | Australia | 5 | evaluate | 
| Pueraria phaseoloides | Fabaceae | tropical kudzu | Assessment | Pacific | 17 | high risk | 
| Pulsatilla violacea | Ranunculaceae | Assessment | U.S. (Florida) | 0 | accept | |
| Punica granatum | Punicaceae | pomegranate | Pacific | 3.5 | low risk* | |
| Pyracantha angustifolia | Rosaceae | firethorn | Assessment | Australia | 18 | reject | 
| Pyracantha angustifolia | Rosaceae | firethorn | Assessment | Pacific | 13 | high risk | 
| Pyracantha crenatoserrata | Rosaceae | firethorn | Assessment | Pacific | 5 | high risk* | 
| Pyracantha koidzumii | Rosaceae | Fomosa firethorn | Assessment | Pacific | 7 | high risk | 
| Pyrgophyllum yunnanensis | Zingiberaceae | Assessment | U.S. (Florida) | -2 | accept | |
| Pyrostegia venusta | Bignoniaceae | flame vine | Assessment | Pacific | 7 | high risk | 
| Pyrrosia piloselloides | Polypodiaceae | dragons scale fern | Assessment | Pacific | 6 | high risk | 
| Ranunculus muricatus | Ranunculaceae | spinyfruit buttercup | Assessment | U.S. (Florida) | 7 | reject | 
| Ranunculus parviflorus | Ranunculaceae | smallflower buttercup | Assessment | U.S. (Florida) | 4 | accept* | 
| Raphia farinifera | Arecaceae | raffia palm | Assessment | Pacific | 5 | evaluate | 
| Rapistrum rugosum | Brassicaceae | bastard cabbage | Assessment | Pacific | 5 | evaluate | 
| Rauvolfia vomitoria | Apocynaceae | poison devil's pepper | Assessment | Pacific | 21 | high risk | 
| Ravenala madagascariensis | Strelitziaceae | traveler's palm | Assessment | Pacific | 5 | evaluate | 
| Ravenea rivularis | Arecaceae | majesty palm | Assessment | Pacific | -3 | low risk | 
| Reinhardtia gracilis | Arecaceae | window pane palm | Assessment | Pacific | 4 | high risk* | 
| Remusatia pumila | Araceae | Assessment | U.S. (Florida) | 4 | accept* | |
| Rhaphiolepis indica | Rosaceae | Indian hawthorn | Assessment | Pacific | 3 | low risk* | 
| Rhaphiolepis umbellata | Rosaceae | Japanese hawthorn | Assessment | Pacific | 0 | evaluate* | 
| Rhapis excelsa | Arecaceae | lady palm | Pacific | 0 | low risk | |
| Rhipsalis baccifera | Cactaceae | mistletoe cactus | Assessment | Pacific | 0 | low risk | 
| Rhizophora mangle | Rhizophoraceae | red mangrove | Assessment | Pacific | 13 | high risk | 
| Ericaceae | evergreen azalea | Pacific | 4 | evaluate | ||
| Rhododendron simsii | Ericaceae | Formosa azalea | Assessment | U.S. (Florida) | 0 | accept | 
| Rhodomyrtus tomentosa | Myrtaceae | rose myrtle | Assessment | Pacific | 8 | high risk | 
| Rhus taitensis | Anacardiaceae | sumac | Assessment | Pacific | 7 | high risk** | 
| Richardia brasiliensis | Rubiaceae | Brazilian pusley | Assessment | U.S. (Florida) | 7 | reject | 
| Richardia scabra | Rubiaceae | Florida pusley | Assessment | U.S. (Florida) | 8 | reject | 
| Ricinus communis | Euphorbiaceae | castor bean | Assessment | Australia | 8 | reject | 
| Ricinus communis | Euphorbiaceae | castor bean | Assessment | Pacific | 21 | high risk | 
| Ricinus communis | Euphorbiaceae | castor bean | Assessment | U.S. | 24 | reject | 
| Ricinus communis | Euphorbiaceae | castor bean | Assessment | U.S. (Florida) | 24 | reject | 
| Rivina humilis | Phytolaccaceae | pigeonberry | Assessment | Pacific | 11 | high risk | 
| Rohdea watanabei | Liliaceae | Assessment | U.S. (Florida) | 0 | accept | |
| Roldana petasitis | Asteraceae | velvet groundsel | Assessment | Pacific | 12 | high risk | 
| Rondeletia amoena | Rubiaceae | rondeletia | Assessment | Pacific | -2 | low risk | 
| Rondeletia leucophylla | Rubiaceae | Panama rose | Assessment | U.S. (Florida) | -1 | accept | 
| Rondeletia odorata | Rubiaceae | rondeletia | Pacific | -4 | low risk | |
| Rosa laevigata | Rosaceae | Cherokee rose | Assessment | Pacific | 16 | high risk | 
| Rosa multiflora | Rosaceae | multiflora rose | Assessment | Pacific | 12 | high risk | 
| Rosenbergiodendron formosum | Rubiaceae | blackberry jam fruit | Assessment | Pacific | 1 | high risk* | 
| Rottboellia cochinchinensis | Poaceae | itchgrass | Assessment | U.S. (Florida) | 22 | reject | 
| Rottboellia cochinchinensis | Poaceae | itchgrass | Assessment | United States | high risk | |
| Roystonia oleracea | Arecaceae | cabbage palm | Assessment | Pacific | -3 | low risk | 
| Arecaceae | Florida royal palm | Pacific | 0 | low risk | ||
| Rubus alceifolius | Rosaceae | giant bramble | Assessment | Australia | 11 | reject | 
| Rosaceae | prickly Florida blackberry | Pacific | 21.5 | high risk | ||
| Rubus discolor | Rosaceae | Himalayan blackberry | Assessment | Pacific | 24 | high risk | 
| Rubus ellipticus | Rosaceae | yellow Himalayan blackberry | Assessment | Pacific | 18 | high risk | 
| Rubus loganobaccus | Rosaceae | boysenberry | Assessment | Pacific | 11 | high risk | 
| Rubus 'Marion' | Rosaceae | Marionberry | Assessment | Pacific | 4 | evaluate | 
| Rubus 'Natchez' | Rosaceae | Rubus 'Natchez' | Assessment | Pacific | 7 | high risk | 
| Rubus niveus | Rosaceae | Ceylon raspberry | Assessment | Pacific | 19 | high risk | 
| Rubus rosifolius | Rosaceae | thimbleberry | Assessment | Pacific | 10 | high risk | 
| Rubus sieboldii | Rosaceae | Molucca raspberry | Assessment | Pacific | 10 | high risk | 
| Rubus 'Triple Crown' | Rosaceae | Triple Crown | Assessment | Pacific | 3 | evaluate | 
| Ruellia caroliniensis | Acanthaceae | Carolina wild petunia | Pacific | 1 | low risk* | |
| Ruellia makoyana | Acanthaceae | monkey plant | Assessment | U.S. (Florida) | -1 | accept | 
| Ruellia squarrosa | Acanthaceae | water bluebell | Assessment | Pacific | 7 | high risk | 
| Ruellia tuberosa | Acanthaceae | minnieroot | Assessment | Pacific | 8 | high risk | 
| Rumex brownii | Polygonaceae | brown dock | Assessment | Australia | 16 | reject | 
| Rumex crispus | Polygonaceae | curly dock | Assessment | Australia | 16 | reject | 
| Rumex crispus | Polygonaceae | curly dock | Assessment | U.S. (Florida) | 26 | reject | 
| Rumex pulcher | Polygonaceae | fiddle dock | Assessment | Australia | 16 | reject | 
| Rumex pulcher | Polygonaceae | fiddle dock | Assessment | U.S. (Florida) | 11 | reject | 
| Rumohra adiantiformis | Polypodiaceae | leatherleaf fern | Assessment | U.S. (Florida) | 3 | accept* | 
| Russelia equisetiformis | Scrophulariaceae | coralplant | Assessment | Pacific | -2 | low risk | 
| Ruttya fruticosa | Acanthaceae | rabbit ears | Assessment | Pacific | 1 | evaluate | 
| Sabal mauritiiformis | Arecaceae | savannah palm | Assessment | Pacific | -2 | low risk | 
| Saccharum arundinaceum | Poaceae | sweetcane | Assessment | U.S. | 3 | accept* | 
| Saccharum arundinaceum | Poaceae | sweetcane | Assessment | U.S. (Florida) | 3 | accept* | 
| Saccharum officinarum | Poaceae | sugar cane | Assessment | Pacific | -2 | low risk | 
| Saccharum officinarum | Poaceae | sugar cane | Assessment | U.S. | 5 | accept* | 
| Saccharum officinarum | Poaceae | sugar cane | Assessment | U.S. (Florida) | 4 | accept* | 
| Saccharum officinarum | Poaceae | sugar cane | Assessment | U.S. (Florida) | 5 | accept* | 
| Saccharum spontaneum | Poaceae | wild sugarcane | Assessment | Pacific | 17 | high risk | 
| Saggitaria sagittifolia | Alismataceae | Chinese arrowhead | Assessment | United States | medium-high | |
| Salicornia virginica | Chenopodiaceae | Virginia pickleweed | Assessment | Pacific | 4 | low risk* | 
| Salix babylonica | Salicaceae | weeping willow | Assessment | Pacific | 9 | high risk | 
| Salsoli kali | Chenopodiaceae | tumbleweed | Assessment | Pacific | 18.5 | high risk | 
| Salvia hispanica | Lamiaceae | chia | Assessment | Pacific | -1 | low risk | 
| Salvia splendens | Lamiaceae | scarlet sage | Assessment | U.S. (Florida) | 4 | accept* | 
| Salvinia molesta | Salviniaceae | salvinia | Assessment | Australia | 19 | reject | 
| Salvinia molesta | Salviniaceae | salvinia | Assessment | Pacific | 29 | high risk | 
| Samanea saman | Fabaceae | monkeypod | Assessment | Pacific | 4 | low risk* | 
| Sambucus mexicana | Caprifoliaceae | Mexican elderberry | Assessment | Pacific | 9 | high risk | 
| Acanthaceae | sanchezia | Pacific | 3 | low risk* | ||
| Sansevieria hyacinthoides | Agavaceae | African bowstring hemp | Assessment | U.S. (Florida) | 14 | reject | 
| Sandoricum koetjape | Meliaceae | red santol | Assessment | Pacific | 1 | evaluate | 
| Agavaceae | monther-in-law's tongue | Pacific | 9 | high risk | ||
| Santalum album | Santalaceae | Indian sandal wood | Assessment | Pacific | -3 | low risk | 
| Saraca asoca | Fabaceae | asoka tree | Assessment | Pacific | 0 | low risk | 
| Saraca declinata | Fabaceae | red saraca | Assessment | Pacific | -3 | low risk | 
| Saraca indica | Fabaceae | Ashoka tree | Pacific | -7 | low risk | |
| Saraca thaipingensis | Fabaceae | yellow saraca | Assessment | Pacific | 2 | low risk | 
| Saritaea magnifica | Bignoniaceae | glowvine | Assessment | Pacific | 1 | evaluate | 
| Satakentia liukiuensis | Arecaceae | satake palm | Assessment | Pacific | -2 | low risk | 
| Sauropus androgynus | Euphorbiaceae | star gooseberry | Assessment | Pacific | 4 | evaluate | 
| Saxifraga sarmentosa | Saxifragaceae | strawberry saxifrage | Pacific | 3 | low risk* | |
| Scabiosa olgae | Dipsacaceae | Assessment | U.S. (Florida) | -2 | accept | |
| Scadoxus multiflorus | Amaryllidaceae | blood lily | Assessment | Pacific | -1 | low risk | 
| Scaevola aemula | Goodeniaceae | common fanflower | Assessment | Pacific | -6 | low risk | 
| Scaevola sericea | Goodeniaceae | beach naupaka | Assessment | U.S. (Florida) | 14 | reject** | 
| Araliaceae | octopus tree | Pacific | 13 | high risk | ||
| Schefflera actinophylla | Araliaceae | octopus tree | Assessment | U.S. (Florida) | 14 | reject | 
| Schefflera arboricola | Araliaceae | dwarf schefflera | Assessment | Pacific | 3 | evaluate | 
| Schefflera elegantissima | Araliaceae | false aralia | Pacific | 0 | low risk | |
| Schefflera heptaphylla | Araliaceae | ivy tree | Assessment | Pacific | 4 | evaluate | 
| Schefflera taiwaniana | Araliaceae | umbrella plant | Assessment | Pacific | 1 | evaluate | 
| Schinus molle | Anacardiaceae | pepper tree | Assessment | Pacific | 10 | high risk | 
| Anacardiaceae | Brazilian pepper | Pacific | 19 | high risk | ||
| Schinus terebinthifolius | Anacardiaceae | Brazilian pepper | Assessment | U.S. (Florida) | 19 | reject | 
| Schizachyrium condensatum | Poaceae | bush beardgrass | Assessment | Pacific | 13 | high risk | 
| Schizostachyum brachycladum | Poaceae | sacred Bali bamboo | Assessment | Pacific | -1 | low risk | 
| Schizostachyum glaucifolium | Poaceae | Hawaiian bamboo | Pacific | 0 | low risk | |
| Schleichera oleosa | Sapindaceae | Ceylon oak | Assessment | Pacific | 1 | evaluate | 
| Schleinitzia insularum | Fabaceae | chotha-hao | Assessment | Pacific | -1 | low risk** | 
| Schotia brachypetala | Fabaceae | elephant hedge bean tree | Pacific | 0 | low risk | |
| Schotia latifolia | Fabaceae | bush boer-bean | Assessment | U.S. (Florida) | 3 | evaluate | 
| Scilla rosenii | Hyacinthaceae | scilla | Assessment | U.S. (Florida) | 1 | accept* | 
| Scleranthus annuus | Caryophyllaceae | German knotweed | Assessment | U.S. (Florida) | 5 | evaluate | 
| Searsia lancea | Anacardiaceae | willow rhus | Assessment | Pacific | 8 | high risk | 
| Sechium edule | Cucurbitaceae | vegetable pear | Assessment | Pacific | 7 | high risk | 
| Sedum pachypyllum | Crassulaceae | jelly beans | Assessment | Pacific | 3 | evaluate | 
| Semecarpus anacardium | Anacardiaceae | marking nut tree | Assessment | Pacific | 5 | evaluate | 
| Senecio cineraria | Asteraceae | dusty miller | Pacific | 2 | low risk* | |
| Senecio madagascariensis | Asteraceae | fireweed | Assessment | Australia | 15 | reject | 
| Asteraceae | fireweed | Pacific | 23 | high risk | ||
| Senecio mandraliscae | Asteraceae | blue finger | Assessment | Pacific | -3 | low riski | 
| Senna alata | Fabaceae | candle bush | Assessment | Australia | 20 | reject | 
| Senna alata | Fabaceae | candle bush | Assessment | Pacific | 10 | high risk | 
| Senna artemisioides | Fabaceae | silver senna | Assessment | Pacific | 9 | high risk | 
| Senna bicapsularis | Fabaceae | Christmasbush | Assessment | Pacific | 8 | high risk | 
| Senna multijuga | Fabaceae | leafy cassia | Assessment | Pacific | 7 | high risk | 
| Senna obtusifolia | Fabaceae | sicklepod | Assessment | Australia | 14 | reject | 
| Senna obtusifolia | Fabaceae | sicklepod | Assessment | Pacific | 20 | high risk | 
| Senna siamea | Fabaceae | cassod tree | Assessment | Pacific | 5 | low risk* | 
| Senna spectabilis | Fabaceae | spectacular cassia | Assessment | Pacific | 11 | high risk | 
| Fabaceae | kolomona | Pacific | 0 | evaluate | ||
| Senna tora | Fabaceae | Java bean | Assessment | Australia | 10 | reject | 
| Sequoia sempervirens | Cupressaceae | California redwood | Pacific | -4 | low risk | |
| Serianthes kanehirae | Fabaceae | ukall | Assessment | Pacific | -5 | low risk | 
| Serissa foetida | Rubiaceae | snow rose | Assessment | U.S. (Florida) | -4 | accept | 
| Serissa japonica | Rubiaceae | serissa | Pacific | -10 | low risk | |
| Sesbania cannabina | Fabaceae | sesbania pea | Assessment | Australia | 17 | reject | 
| Sesbania grandiflora | Fabaceae | scarlet wisteria tree | Assessment | Pacific | 2 | low risk* | 
| Fabaceae | rattlebox | Pacific | 9.5 | high risk | ||
| Sesbania sesban | Fabaceae | Egyptian riverhemp | Assessment | Pacific | 11 | high risk | 
| Setaria italica | Poaceae | foxtail millet | Assessment | Australia | 3 | evaluate | 
| Setaria italica | Poaceae | foxtail millet | Assessment | Pacific | 9 | high risk | 
| Setaria palmifolia | Poaceae | palmgrass | Assessment | Australia | 7 | reject | 
| Setaria setosa | Poaceae | West Indian bristlegrass | Assessment | U.S. (Florida) | 1 | accept* | 
| Setaria sphacelata | Poaceae | African bristle grass | Assessment | Pacific | 19 | high risk | 
| Sherardia arvensis | Rubiaceae | blue fieldmadder | Assessment | U.S. (Florida) | 7 | reject | 
| Sida acuta | Malvaceae | broom weed | Assessment | Australia | 19 | reject | 
| Sida cordifolia | Malvaceae | flannelweed | Assessment | Australia | 15 | reject | 
| Sida rhombifolia | Malvaceae | paddy's lucerne | Assessment | Australia | 13 | reject | 
| Sida spinosa | Malvaceae | prickly sida | Assessment | U.S. (Florida) | 9 | reject | 
| Sideroxylon persimile | Sapotaceae | bastard cherry | Assessment | Pacific | 8 | high risk | 
| Sigesbeckia orientalis | Asteraceae | small yellow crownbeard | Assessment | Pacific | 13 | high risk | 
| Silene armeria | Caryophyllaceae | sweet William catchfly | Assessment | Pacific | 7 | high risk | 
| Silene pygmaea | Caryophyllaceae | Assessment | U.S. (Florida) | -2 | accept | |
| Silybum marianum | Asteraceae | milk thistle | Assessment | Pacific | 17.5 | high risk | 
| Simmondsia chinensis | Simmondsiaceae | jojoba | Assessment | Pacific | -3 | low risk | 
| Sinacalia tangutica | Asteraceae | Chinese ragwort | Assessment | U.S. (Florida) | 7 | reject | 
| Sindora supa | Fabaceae | supa | Assessment | Pacific | 5 | evaluate | 
| Sinocalamus latiflorus | Poaceae | wideleaf bamboo | Assessment | U.S. (Florida) | -2 | accept | 
| Siparuna pauciflora | Monimiaceae | Assessment | U.S. (Florida) | -2 | accept | |
| Smilacina fusca | Convallariaceae | Assessment | U.S. (Florida) | 0 | accept | |
| Solandra maxima | Solanaceae | golden cup | Assessment | Pacific | 3 | evaluate | 
| Solanum aethiopicum | Solanaceae | Chinese scarlet eggplant | Assessment | Pacific | 4 | low risk* | 
| Solanum betaceum | Solanaceae | tree tomato | Assessment | Pacific | 7 | high risk | 
| Solanum capsicoides | Solanaceae | cockroach berry | Assessment | Pacific | 15 | high risk | 
| Solanum glaucophyllum | Solanaceae | waxy-leaf nightshade | Assessment | Pacific | 10 | high risk | 
| Solanum lycopersicum | Solanaceae | wild tomato | Assessment | Australia | 2 | evaluate | 
| Solanum mauritianum | Solanaceae | bugtree | Assessment | Pacific | 24 | high risk | 
| Solanum melongena | Solanaceae | eggplant | Assessment | Pacific | 1 | low risk* | 
| Solanum muricatum | Solanaceae | melon pear | Assessment | Pacific | 5 | low risk* | 
| Solanum quitoense | Solanaceae | naranjilla | Assessment | Pacific | 11 | high risk | 
| Solanum seaforthianum | Solanaceae | Brazilian nightshade | Assessment | Pacific | 9 | high risk | 
| Solanum torvum | Solanaceae | turkeyberry | Assessment | Pacific | 24 | high risk | 
| Solanum viarum | Solanaceae | tropical soda apple | Assessment | U.S. (Florida) | 24 | reject | 
| Solanum viarum | Solanaceae | tropical soda apple | Assessment | United States | high risk | |
| Sonneratia caseolaris | Lythraceae | crabapple mangrove | Assessment | U.S. (Florida) | 2 | evaluate | 
| Sophora tomentosa | Fabaceae | yellow necklacepod | Pacific | -3 | low risk | |
| Sorghum bicolor | Poaceae | grain sorghum | Assessment | Australia | 3 | evaluate | 
| Sorghum bicolor | Poaceae | grain sorghum | Assessment | Pacific | 6 | low risk* | 
| Sorghum bicolor ssp. drummondii | Poaceae | shattercane | Assessment | Pacific | 17.5 | high risk | 
| Sorghum bicolor (grain sorghum) | Poaceae | grain sorghum | Assessment | U.S. (Florida) | 7 | reject | 
| Sorghum bicolor (shattercane) | Poaceae | shattercane | Assessment | U.S. (Florida) | 18 | reject | 
| Sorghum bicolor (sweet) | Poaceae | shattercane | Assessment | U.S. | 3 | accept* | 
| Sorghum bicolor (sweet) | Poaceae | sweet sorghum | Assessment | U.S. (Florida) | 2 | accept* | 
| Sorghum halepense | Poaceae | Johnson grass | Assessment | Australia | 25 | reject | 
| Soulamea amara | Simaroubaceae | bitter tree | Assessment | Pacific | -1 | low risk | 
| Fabaceae | Spanish broom | Pacific | 12 | high risk | ||
| Spathiphyllum cannifolium | Araceae | spathe flower | Pacific | -4 | low risk | |
| Spathiphyllum wallisii | Araceae | peace lily | Pacific | -4 | low risk | |
| Spathodea campanulata | Bignoniaceae | African tulip tree | Assessment | Pacific | 14 | high risk | 
| Spathoglottis plicata | Orchidaceae | Philippine ground orchid | Assessment | Pacific | 16 | high risk | 
| Spathoglottis unguiculata | Orchidaceae | clawed spathoglottis | Assessment | Pacific | 3 | low risk* | 
| Spergula arvensis | Caryophyllaceae | corn spurrey | Assessment | U.S. (Florida) | 20 | reject | 
| Sphagneticola trilobata | Asteraceae | Singapore daisy | Assessment | Australia | 6 | reject | 
| Sphagneticola trilobata | Asteraceae | Singapore daisy | Assessment | Pacific | 13 | high risk | 
| Sphagnum palustre | Sphagnaceae | peat moss | Assessment | Pacific | 12.5 | high risk | 
| Spiraea cantoniensis | Rosaceae | Reeve's spiraea | Assessment | Pacific | 4 | evaluate | 
| Spiraea mongolica | Rosaceae | Assessment | U.S. (Florida) | 0 | accept | |
| Spondias dulcis | Anacardiaceae | wi apple | Pacific | -5 | low risk | |
| Spondias mombin | Anacardiaceae | mombin | Assessment | Pacific | 10 | high risk | 
| Spondias purpurea | Anacardiaceae | purple mombin | Assessment | Pacific | 5 | evaluate | 
| Sporobolus indicus | Poaceae | smutgrass | Assessment | U.S. (Florida) | 18 | reject | 
| Sporobolus pyramidatus | Poaceae | whorled dropseed | Assessment | Pacific | 14 | high risk | 
| Stachytarpheta cayennensis | Verbenaceae | blue rat's tail | Assessment | Australia | 20 | reject | 
| Stachytarpheta mutabilis | Verbenaceae | coral porterweed | Assessment | Pacific | 12 | high risk | 
| Stapelia gigantea | Apocynaceae | giant toadplant | Assessment | Pacific | 3 | low risk* | 
| Stellaria media | Caryophyllaceae | common chickweed | Assessment | U.S. (Florida) | 25 | reject | 
| Stemmadenia litoralis | Apocynaceae | lecheso | Pacific | -5 | low risk | |
| Stenocarpus sinuatus | Proteaceae | wheel of fire | Assessment | Pacific | -4 | low risk | 
| Stenotaphrum secundatum | Poaceae | St. Augustine grass | Assessment | Australia | 6 | reject | 
| Stenotaphrum secundatum | Poaceae | St. Augustine grass | Assessment | Pacific | 15 | high risk | 
| Stepanotis floribunda | Apocynaceae | wedding flower | Assessment | Pacific | -4 | low risk | 
| Sterculia apetala | Sterculiaceae | Panama tree | Assessment | Pacific | 4 | evaluate | 
| Sterculia foetica | Sterculiaceae | Java olive | Assessment | Pacific | 3 | low risk* | 
| Stigmaphyllon floribundum | Malpighiaceae | woolly Amazon vine | Assessment | Pacific | -6 | low risk | 
| Strelitzia nicolai | Strelitziaceae | bird of paradise tree | Assessment | Pacific | -1 | low risk | 
| Strelitzia reginae | Strelitziaceae | bird of paradise | Pacific | -3 | low risk | |
| Streptosolen jamesonii | Solanaceae | marmalade bush | Assessment | Pacific | 2 | low risk | 
| Striga gesnerioides | Orobanchaceae | cowpea witchweed | Assessment | U.S. (Florida) | 15 | reject | 
| Strobilanthes dyeriana | Acanthaceae | Persian shield | Assessment | Pacific | 7 | high risk | 
| Strobilanthes glomerata | Acanthaceae | strobilanthes | Assessment | Pacific | 4 | evaluate | 
| Stromanthe macrochlamys | Marantaceae | stromanthe | Assessment | Pacific | 0 | low risk | 
| Stromanthe tonckat | Marantaceae | stromanthe | Assessment | Pacific | 7 | high risk | 
| Strongylodon macrobotrys | Fabaceae | jade vine | Assessment | Pacific | -9 | low risk | 
| Strophanthus amboensis | Apocynaceae | elephant vine | Assessment | Pacific | 2 | evaluate | 
| Strophanthus gratus | Apocynaceae | climbing oleander | Assessment | Pacific | 0 | low risk | 
| Strophanthus preussii | Apocynaceae | climbing oleander | Assessment | Pacific | 0 | low risk | 
| Strychnos toxifera | Loganiaceae | strychnine | Assessment | U.S. (Florida) | -2 | accept | 
| Stylosanthes guianensis | Fabaceae | stylo | Assessment | Australia | 12 | reject | 
| Stylosanthes guianensis | Fabaceae | stylo | Assessment | Pacific | 11 | high risk | 
| Fabaceae | shrubby stylo | Pacific | 1 | low risk* | ||
| Suriana maritima | Surianaceae | bay cedar | Assessment | Pacific | 2 | evaluate** | 
| Meliaceae | large-leaf mahogany | Pacific | 4 | evaluate | ||
| Swietenia mahagoni | Meliaceae | West Indian mahogany | Pacific | 2 | low risk* | |
| Syagrus romanzoffiana | Arecaceae | queen palm | Assessment | Pacific | -2 | low risk | 
| Synadenium grantii | Euphorbiaceae | African milkbush | Assessment | Pacific | 4 | low risk* | 
| Synadenium grantii | Euphorbiaceae | African milkbush | Assessment | U.S. (Florida) | 3 | accept | 
| Syngonium auritum | Araceae | five-fingers | Assessment | Pacific | 1 | low risk* | 
| Syngonium podophyllum | Araceae | arrowhead plant | Assessment | Pacific | 15 | high risk | 
| Synsepalum dulcificum | Sapotaceae | miracle fruit | Assessment | Pacific | -3 | low risk | 
| Syzygium australe | Myrtaceae | brush cherry | Assessment | Pacific | 15 | high risk | 
| Syzygium cumini | Myrtaceae | Java plum | Assessment | Pacific | 9 | high risk | 
| Syzygium cumini | Myrtaceae | Java plum | Assessment | U.S. (Florida) | 9 | reject | 
| Syzygium jambos | Myrtaceae | Malabar-plum | Assessment | Pacific | 20 | high risk | 
| Syzygium malaccense | Myrtaceae | mountain apple | Assessment | Pacific | 0 | low risk | 
| Syzygium polyanthum | Myrtaceae | Indian bayleaf | Assessment | Pacific | 7 | high risk | 
| Tabebuia aurea | Bignoniaceae | silver trumpet tree | Assessment | Pacific | 3 | low risk* | 
| Tabebuia berteroi | Bignoniaceae | Hispaniolan rosy trumpet tree | Assessment | Pacific | -4 | low risk | 
| Tabebuia donnell-smithii | Bignoniaceae | gold tree | Pacific | -4 | low risk | |
| Tabebuia heterophylla | Bignoniaceae | pink trumpet tree | Assessment | Pacific | 1 | low risk* | 
| Tabebuia impetiginosa | Bignoniaceae | mauve tabebuia | Assessment | Pacific | -2 | low risk | 
| Tabebuia ochracea | Bignoniaceae | golden trumpet tree | Assessment | Pacific | -3 | low risk | 
| Tabebuia pallida | Bignoniaceae | Cuban pink trumpet-tree | Assessment | Pacific | 11 | high risk | 
| Tabebuia rosea | Bignoniaceae | rosy trumpet tree | Assessment | Pacific | 3 | evaluate | 
| Tabernaemontana divaricata | Apocynaceae | crepe jasmine | Assessment | Pacific | -1 | low risk | 
| Tabernaemontana elegans | Apocynaceae | warty toad tree | Assessment | Pacific | -1 | low risk | 
| Tabernaemontana sananho | Apocynaceae | uchu sanango | Assessment | U.S. (Florida) | -2 | accept | 
| Tacca chantrieri | Taccaceae | batflower | Assessment | Pacific | 5 | evaluate | 
| Tacca leontopetaloides | Taccaceae | Polynesian arrowroot | Pacific | 0 | low risk | |
| Tagetes minuta | Asteraceae | Aztec marigold | Assessment | Pacific | 20 | high risk | 
| Talinum paniculatum | Portulacaceae | jewels of Opar | Assessment | Pacific | 16 | high risk | 
| Talipariti elatum | Malvaceae | blue mahoe | Pacific | 5 | low risk* | |
| Talipariti macrophyllum | Malvaceae | largeleaf rosemallow | Assessment | Pacific | 3 | evaluate | 
| Talisia esculenta | Sapindaceae | pitomba | Assessment | Pacific | -1 | low risk | 
| Fabaceae | tamarind | Pacific | -3 | low risk | ||
| Tamarix aphylla | Tamaricaceae | Athel tamarisk | Assessment | Pacific | 13 | high risk | 
| Tamarix gallica | Tamaricaceae | saltcedar | Assessment | Pacific | 8.5 | high risk | 
| Tamarix parviflora | Tamaricaceae | small flower tamarisk | Assessment | Pacific | 8 | high risk | 
| Tapeinochilos ananassae | Costaceae | pineapple ginger | Assessment | Pacific | -5 | low risk | 
| Tarlmounia elliptica | Asteraceae | kheua sa lot | Assessment | Pacific | 6 | evaluate | 
| Tecoma alata | Bignoniaceae | cahuato | Assessment | Pacific | -3 | low risk | 
| Bignoniaceae | cape honeysuckle | Pacific | 6 | evaluate | ||
| Tecoma guarume | Bignoniaceae | cahuato | Assessment | U.S. (Florida) | 1 | evaluate | 
| Tecoma stans | Bignoniaceae | yellow bells | Assessment | Pacific | 8 | high risk | 
| Tecomanthe dendrophila | Bignoniaceae | forest bell creeper | Assessment | Pacific | -1 | low risk | 
| Tectaria incisa | Dryopteridaceae | incised halberd fern | Assessment | U.S. (Florida) | 2 | accept* | 
| Tectona grandis | Verbenaceae | teak | Pacific | -5 | low risk | |
| Telopea speciosissima | Proteaceae | New South Wales waratah | Assessment | Pacific | -8 | low risk | 
| Telosma cordata | Apocynaceae | Chinese violet | Assessment | Pacific | -4 | low risk | 
| Tephrosia candida | Fabaceae | white hoarypea | Assessment | Australia | 11 | reject | 
| Tephrosia candida | Fabaceae | white hoarypea | Assessment | Pacific | 8 | high risk | 
| Tephrosia purpurea | Fabaceae | pila | Pacific | 7 | high risk** | |
| Terminalia catappa | Combretaceae | tropical almond | Assessment | Pacific | 4 | low risk* | 
| Terminalia ivorensis | Combretaceae | black afara | Assessment | Pacific | 8 | high risk | 
| Terminalia mantaly | Combretaceae | Madagascar almond | Assessment | Pacific | 3 | low risk* | 
| Terminalia melanocarpa | Combretaceae | beach almond | Assessment | Pacific | -1 | low risk | 
| Terminalia myriocarpa | Combretaceae | East Indian almond | Assessment | Pacific | -2 | low risk | 
| Terminalia randii | Combretaceae | small-leaved terminalia | Assessment | U.S. (Florida) | 2 | evaluate | 
| Tetragonia tetragonoides | Aizoaceae | New Zealand spinach | Assessment | Pacific | 7 | high risk | 
| Tetrapanax papyrifer | Araliaceae | rice-paper-plant | Assessment | Pacific | 5 | evaluate | 
| Tetrapanax papyrifer | Araliaceae | Chinese rice-paper plant | Assessment | U.S. (Florida) | 6 | evaluate | 
| Tetrastigma leucostaphylum | Vitaceae | Assessment | Pacific | 2 | evaluate | |
| Tetrastigma pubinerve | Vitaceae | tetrastigma | Assessment | Pacific | 8 | high risk | 
| Tetrastigma voinierianum | Vitaceae | lizard plant | Assessment | Pacific | 8 | high risk | 
| Tetrazygia bicolor | Melastomataceae | Florida clover ash | Assessment | Pacific | 7 | high risk | 
| Thelypteris beddomei | Thelypteridaceae | Assessment | U.S. (Florida) | 2 | accept* | |
| Themedia quadrivalvis | Poaceae | grader grass | Assessment | Australia | 1 | evaluate | 
| Theobroma cacao | Sterculiaceae | cocoa | Pacific | -5 | low risk | |
| Thespesia grandiflora | Malvaceae | maga | Assessment | Pacific | -4 | low risk | 
| Thespesia populnea | Malvaceae | milo | Assessment | Pacific | 9 | high risk** | 
| Thespesia populnea | Malvaceae | milo | Assessment | U.S. (Florida) | 13 | reject** | 
| Thevetia peruviana | Apocynaceae | yellow oleander | Assessment | Pacific | 9 | high risk | 
| Thevetia thevetioides | Apocynaceae | giant Thevetia | Assessment | Pacific | 1 | low risk* | 
| Tlaspi arvense | Brassicaceae | pennycress | Assessment | Pacific | 19 | high risk | 
| Thrinax parviflora | Arecaceae | thatch palm | Pacific | -6 | low risk | |
| Thrinax radiata | Arecaceae | Florida thatch palm | Assessment | Pacific | -2 | low risk | 
| Thunbergia alata | Acanthaceae | black-eyed-susan vine | Assessment | Pacific | 14 | high risk | 
| Thunbergia erecta | Acanthaceae | bush thunbergia | Pacific | -2 | low risk | |
| Thunbergia fragrans | Acanthaceae | white lady | Assessment | Pacific | 9 | high risk | 
| Thunbergia grandiflora | Acanthaceae | blue trumpet vine | Assessment | Australia | 13 | reject | 
| Acanthaceae | blue trumpet vine | Pacific | 11 | high risk | ||
| Thunbergia laurifolia | Acanthaceae | blue trumpet vine | Assessment | Pacific | 11 | high risk | 
| Thunbergia mysorensis | Acanthaceae | mysore clock vine | Assessment | Pacific | -6 | low risk | 
| Thuja x 'Green Giant' | Cupressaceae | green giant | Assessment | Pacific | -14 | low risk | 
| Thymus vulgaris | Lamiaceae | thyme | Assessment | Pacific | 4 | low risk* | 
| Tibouchina granulosa | Melastomataceae | purple glorybush | Assessment | Pacific | 8 | high risk | 
| Tibouchina herbacea | Melastomataceae | cane tibouchina | Assessment | Pacific | 24 | high risk | 
| Tibouchina longifolia | Melastomataceae | long leaf glory tree | Assessment | Pacific | 3 | evaluate | 
| Tibouchina multiflora | Melastomataceae | today-tomorrow tibouchina | Assessment | Pacific | -4 | low risk | 
| Melastomataceae | glory bush | Pacific | 10 | high risk | ||
| Tillandsia cyanea | Bromeliaceae | pink quill | Pacific | -5 | low risk | |
| Tillandsia usneoides | Bromeliaceae | Spanish moss | Assessment | Pacific | 9 | high risk | 
| Tipuana tipu | Fabaceae | tipu tree | Pacific | 0 | low risk | |
| Tithonia diversifolia | Asteraceae | Mexican sunflower | Assessment | Pacific | 17 | high risk | 
| Toona ciliata | Meliaceae | Australian red cedar | Assessment | Pacific | 12 | high risk | 
| Topobea parasitica | Melastomataceae | topobea | Assessment | Pacific | 3 | high risk* | 
| Torilis arvensis | Apiaceae | common Hedge Parsley | Assessment | Pacific | 9 | high risk | 
| Tournefortia argentea | Boraginaceae | tree heliotrope | Pacific | 4 | evaluate** | |
| Trachelospermum jasminoides | Apocynaceae | confederate jasmine | Assessment | Pacific | -3 | low risk | 
| Trachelospermum jasminoides | Apocynaceae | confederate jasmine | Assessment | U.S. (Florida) | -2 | accept | 
| Tradescantia fluminensis | Commelinaceae | wandering jew | Assessment | Pacific | 17 | high risk | 
| Tradescantia fluminensis | Commelinaceae | white-flowered wandering jew | Assessment | U.S. (Florida) | 18 | reject | 
| Tradescantia spathacea | Commelinaceae | boat-lily | Assessment | Pacific | 11 | high risk | 
| Trevesia palmata | Araliaceae | snowflake tree | Assessment | Pacific | 5 | evaluate | 
| Triadica sebifera | Euphorbiaceae | Chinese tallow | Assessment | Pacific | 14 | high risk | 
| Triadica sebifera | Euphorbiaceae | Chinese tallow | Assessment | U.S. (Florida) | 18 | reject | 
| Tribulus terrestris | Zygophyllaceae | puncture vine | Assessment | Australia | 14 | reject | 
| Tribulus terrestris | Zygophyllaceae | puncture vine | Assessment | Pacific | 11 | high risk | 
| Tricyrtis affinis | Liliaceae | Assessment | U.S. (Florida) | 4 | accept* | |
| Tridax procumbens | Asteraceae | tridax daisy | Assessment | United States | high risk | |
| Triphasia trifolia | Rutaceae | limeberry | Assessment | Pacific | 9 | high risk | 
| Triplaris weigeltiana | Polygonaceae | long john | Assessment | Pacific | 4 | high risk* | 
| Tristellateia australasiae | Malpighiaceae | galphimia vine | Assessment | Pacific | -3 | low risk | 
| Tulipa gesneriana | Liliaceae | Didier's tulip | Assessment | U.S. (Florida) | 3 | accept* | 
| Tulipa karabachensis | Liliaceae | Assessment | U.S. (Florida) | 1 | accept* | |
| Tupistra nutans | Asparagaceae | Assessment | U.S. (Florida) | -1 | accept | |
| Turbina corymbosa | Convolvulaceae | turbina | Assessment | Pacific | 15 | high risk | 
| Turneraceae | yellow alder | Pacific | 10 | high risk | ||
| Typha latifolia | Typhaceae | common cattail | Assessment | Pacific | 26 | high risk | 
| Ulex europaeus | Fabaceae | gorse | Assessment | Australia | 26 | reject | 
| Ulex europaeus | Fabaceae | gorse | Assessment | Pacific | 20 | high risk | 
| Ulmus parvifolia | Ulmaceae | Chinese elm | Assessment | Pacific | 12 | high risk | 
| Ulmus pumila | Ulmaceae | Siberian elm | Assessment | Pacific | 9 | high risk | 
| Urochloa brizantha | Poaceae | signal grass | Assessment | Australia | 4 | evaluate | 
| Urochloa decumbens | Poaceae | basilisk signal grass | Assessment | Australia | 10 | reject | 
| Urochloa humidicola | Poaceae | creeping signal grass | Assessment | Australia | 4 | more information | 
| Urochloa mutica | Poaceae | para grass | Assessment | Australia | 14 | reject | 
| Urochloa mutica | Poaceae | para grass | Assessment | Pacific | 12 | high risk | 
| Urochloa subquadripara | Poaceae | tropical signalgrass | Assessment | U.S. (Florida) | 8 | reject | 
| Vaccinium corymbosum hybrid | Ericaceae | southern highbush | Assessment | Pacific | 2 | evaluate | 
| Vaccinium virgatum | Ericaceae | southern black blueberry | Assessment | Pacific | 2 | evaluate | 
| Vachellia campechiana | Fabaceae | cubata | Assessment | Pacific | 5 | low risk* | 
| Vachellia xanthophloea | Fabaceae | fever tree | Assessment | Pacific | 2 | low risk* | 
| Vanda tricolor | Orchidaceae | Assessment | Pacific | 8 | high risk | |
| Vangueria madagascariensis | Rubiaceae | Spanish tamarind | Assessment | U.S. (Florida) | 3 | accept* | 
| Vanilla planifolia | Orchidaceae | vanilla | Assessment | Pacific | 9 | high risk | 
| Veitchia joannis | Arecaceae | Joannis palm | Pacific | -1 | low risk | |
| Veitchia merrillii | Arecaceae | Manila palm | Pacific | -2 | low risk | |
| Veitchia montgomeryana | Arecaceae | Montgomery palm | Pacific | -1 | low risk | |
| Veitchia winin | Arecaceae | Winin palm | Pacific | -4 | low risk | |
| Verbascum thapsus | Scrophulariaceae | common mullein | Assessment | Pacific | 11 | high risk | 
| Verbesina encelioides | Asteraceae | golden crown-beard | Assessment | Pacific | 19 | high risk | 
| Verbesina turbacensis | Asteraceae | verbesina | Assessment | Pacific | 5 | evaluate | 
| Vicia sativa | Fabaceae | common vetch | Assessment | Australia | 9 | reject | 
| Vigna radiata | Fabaceae | mung bean | Assessment | Australia | -1 | accept | 
| Vigna speciosa | Fabaceae | prairie vetch | Assessment | Pacific | 6 | evaluate | 
| Vitex agnus-castus | Lamiaceae | chastetree | Assessment | Pacific | 9 | high risk | 
| Vitex parviflora | Lamiaceae | smallflower chastetree | Assessment | Pacific | 9 | high risk | 
| Vitex trifolia | Lamiaceae | blue vitex, Indian privet | Assessment | Pacific | 9 | high risk** | 
| Voacanga thouarsii | Apocynaceae | wild frangipani | Assessment | U.S. (Florida) | 0 | accept | 
| Vulpia myuros | Poaceae | rat-tail fescue | Assessment | U.S. (Florida) | 16 | reject | 
| Wallaceodendron celebicum | Fabaceae | banuyo | Assessment | Pacific | 0 | low risk | 
| Washingtonia filifera | Arecaceae | Washington palm | Assessment | Pacific | 11.5 | high risk | 
| Washingtonia robusta | Arecaceae | Mexican fan palm | Assessment | Pacific | 15 | high risk | 
| Washingtonia robusta | Arecaceae | Mexican fan palm | Assessment | U.S. (Florida) | 10 | reject | 
| Wisteria brachybotrys | Fabaceae | silky wisteria | Assessment | U.S. (Florida) | 2 | accept* | 
| Wisteria floribunda | Fabaceae | Japanese wisteria | Assessment | Pacific | 12 | high risk | 
| Wodyetia bifurcata | Arecaceae | foxtail palm | Assessment | Pacific | 0 | low risk | 
| Wollastonia biflora | Asteraceae | wedelia | Assessment | Pacific | 0 | low risk | 
| Xanthium strumarium | Asteraceae | cocklebur | Assessment | Australia | 7 | reject | 
| Xanthorrhoea preissii | Xanthorrhoeaceae | grass tree | Assessment | Pacific | -5 | low risk | 
| Araceae | elephant ear | Pacific | 3 | evaluate | ||
| Yucca guatemalensis | Agavaceae | bluestem yucca | Pacific | 6 | low risk* | |
| Zamia furfuracea | Zamiaceae | cardboard plant | Pacific | -2 | low risk | |
| Zantedeschia aethiopica | Araceae | calla lily | Assessment | Australia | 13 | reject | 
| Zantedeschia aethiopica | Araceae | calla lily | Assessment | Pacific | 15 | high risk | 
| Zingiber zerumbet | Zingiberaceae | shampoo ginger | Pacific | -1 | low risk | |
| Ziziphus mauritiana | Rhamnaceae | chinee apple | Assessment | Australia | 12 | reject | 
| Ziziphus mauritiana | Rhamnaceae | chinee apple | Assessment | Pacific | 9.5 | high risk | 
| Zoysia japonica | Poaceae | Korean lawngrass | Pacific | 6 | low risk* | |
| Zoysia tenuifolia | Poaceae | templegrass | Pacific | -2 | low risk | 
*Accepted or rejected based on 
second screen
**Native or early introduction in the Pacific region (excluding Hawai‘i).
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This page updated 22 March 2013