NOTICE: The WeedUS Database of plants invading natural areas in the U.S. (including Hawaii) has been compiled from a wide variety of sources including publications, reports, surveys, and occasional personal observations from experts in the field. Sources include the National Park Service and other federal agencies, state and local natural resource departments, The Nature Conservancy, state and regional Exotic Pest Plant Councils and related organizations, universities and others. Sources for each plant listed are provided on the table -- click on the REFERENCE(S) header to go to a legend for the source codes. The current list includes over 1,000 plants and is updated as needed. Please contact Jil Swearingen (jil_swearingen@nps.gov) regarding any errors, omissions or potential additions to the list.
The purpose of this list is informational and educational and it is neither intended nor approved for use as a regulatory tool. Many of the species on this list are economically important horticultural plants but sometimes cause problems when they escape and establish in natural areas.
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Download the complete WeedUS Excel filePlant Conservation Aliance - Alien Plant Working Group's
Species beginning with the letter A |
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SCIENTIFIC NAME | COMMON NAME | STATES | NATIONAL PARKS | REFERENCE(S) | FACT SHEET |
Abrus precatorius | rosary pea; crab's eyes | FL | ABS, FC, FLEPPC | Volunteer | |
Abutilon grandifolium | Hairy abutilon; ma'o | HI | HALE | JS | Volunteer |
Abutilon theophrasti | velvetleaf; Indian mallow: butterprint; pie-maker | MI, OR, VA, WA | AAPR, FC, JA, PNWEPPC | Volunteer | |
Acacia auriculiformis | earleaf acacia | FL | FC, FLEPPC, | In Progress | |
Acacia longifolia | Sydney golden wattle | CA, FL | SR | Volunteer | |
Acacia mearnsii | black wattle | HI | HALE | JS, TNC, UHI | Volunteer |
Acacia melanoxylon | Australian blackwood; blackwood acacia | CA, HI | HALE | FC, JS, SR, TNC, UHI | Volunteer |
Acacia retinodes | water wattle; wirilda | CA, FL | SR | Volunteer | |
Acacia confusa | small Philippine wattle | HI | UHI | Volunteer | |
Acer campestre | hedge maple; field maple | OH | SR | Volunteer | |
Acer ginnala | Amur maple | CT, IL, MA, MO, NY, VT, WI | CIPWG, EU, FC, MODOC, SR, WIDNR | In Progress | |
Acer palmatum | Japanese maple | VA, DC | ROCR | JS | Volunteer |
Acer platanoides | Norway maple | CT, DC, DE, IL, IN, MA, MD, ME, MI, NH, NJ, NY, OR, PA, TN, VA, VT, WI, WV | ACAD, ANTI, CHOH, COLO, EISE, GETT, HAFE, MONO, ROCR | AAPR, CIPWG, CTDEP, DNREC, EU, FC, INPAWS, IPCNYS, MDCES, MDDNR, NHISC, NJDA, JS, NPSO, PADCNR, PERT, SR, TL, TNC, VADCR, WIDNR | In Progress |
Acer pseudoplatanus | Sycamore maple; mock plane | CT, PA | CIPWG, FC, PERT, PADCNR, TNC, | Volunteer | |
Acroptilon repens | hardheads | AZ, CO, ID, NV, OR, SD, UT, WA, WI, WY | BADL, CANY, DINO, GLCA, GRCA, LAME, THRO, YELL | FC, JS, PNWEPPC, TNC, WIDNR | Volunteer |
Adenanthera pavonina | red sandal wood, coralwood | FL | FC, SR | Volunteer | |
Adiantum hispidulum | rough maidenhair | HI | HALE | JS | Volunteer |
Adiantum raddianum | Delta maidenhair | HI | HALE | JS | Volunteer |
Aegilops cylindrica | jointed goatgrass | AZ, OK, OR, WA | GRCA | FC, JS, PNWEPPC, TNC | Volunteer |
Aegopodium podagraria | goutweed, bishop's weed, ground elder | CT, MI, NJ, PA, VT, WI | AAPR, CIPWG, FC, NJDA, PERT, PADCNR, VTDEC, WIDNR | Yes | |
Aesculus hippocastanum | horse chestnut | GA, ME, OR, PA, WI | FC, NPSO, SR | Volunteer | |
Agave sisalana | hemp-plant; sisal hemp | HI | HALE | FC, JS | Volunteer |
Ageratina adenophora | sticky snakeroot; Crofton weed | HI | HALE | FC, JS | Volunteer |
Ageratina riparia | spreading snake-root; hamakua pa'makani | HI | HALE | JS | Volunteer |
Ageratum conyzoides | maile-hohono | HI | HALE | JS | Volunteer |
Agropyron cristatum | crested wheatgrass | NV, UT | LAME, THRO, YELL | FC, JS | Volunteer |
Agrostis capillaris | colonial beatgrass | OR, TN, VA, WA | FC, JS, PNWEPPC, TNC, VADCR | Volunteer | |
Agrostis gigantea | redtop | NY, OR, TN, VA | COLO | JS, TNC, VADCR | Volunteer |
Agrostis stolonifera | creeping bentgrass | AZ, CA, HI, NV, OR, TX, UT, WA | DEVA, GLCA, HALE, LAME, YELL | FC, JS, PNWEPPC | Volunteer |
Ailanthus altissima | tree-of-heaven; stinking shumac; copal tree; varnish tree | AZ, CA, CT, DC, DE, FL, HI, IN, KY, LA, MA, MD, MI, MO, NC, NH, NJ, NM, NY, OH, OK, OR, PA, RI, SC, TN, VA, WA, WI, WV | ANTI, APCO, BLRI, BOWA, CATO, CHOH, COLO, DEVA, DEWA, EISE, FRSP, GETT, GEWA, GRCA, GRSM, HAFE, INDU, KIMO, MANA, MONO, NACE, PETE, PRWI, RICH, ROCR, SHEN, STRI, VICK, YOSE | AAPR, CAEPPC, CIPWG, DNREC, FC, UHI, INPAWS, KYEPPC, MDCES, MDDNR, MODOC, NCDPR, NHISC, NJDA, JS, NPSO, PADCNR, PERT, PNWEPPC, SR, TNC, TL, TNEPPC, VADCR, WIDNR | Yes |
Aira caryophyllea | silver hairgrass | CT, HI | HALE, YELL | CIPWG, JS | Volunteer |
Ajuga reptans | creeping bugleweed; carpet bugleweed | MD, TN, VA | COLO | MDCES, MDDNR, JS, VADCR | Volunteer |
Akebia quinata | five-leaf akebia; chocolate vine | DC, MD, NJ, KY, PA, VA | COLO, DEWA, ROCR | KYEPPC, NJDA, JS, PADCNR, PERT, VADCR | Yes |
Albizia julibrissin | silk tree; mimosa | DC, FL, GA, KY, LA, MA, NC, NJ, SC, TN, VA, WV | BLRI, COLO, GRSM, HAFE, KIMO, PETE, PRWI, ROCR, STRI | ABS, FC, FLEPPC, GAEPPC, KYEPPC, NCDEHNR, NJDA, JS, SR, TNEPPC, VADCR | Yes |
Albizia lebbeck | woman's tongue tree; lebbeck tree | FL | FC, FLEPPC, SR, | In Progress | |
Alcea rosea | hollyhock | CA | DEVA | JS | Volunteer |
Alhagi maurorum | camel thorn | AZ, CO, OR, UT, WA | GLCA, GRCA, WUPA | AZJS, FC, JS, PNWEPPC, TNC | In Progress |
Allamanda cathartica | golden-trumpet; common allamanda | FL | SR | Volunteer | |
Alliaria petiolata | garlic mustard | AK, CT, DC, DE, GA, IA, IL, IN, KY, MA, MD, ME, MI, MO, NC, NH, NJ, NY, OH, OR, PA, TN, VA, VT, WI, WV | ACAD, ANTI, BLRI, CHOH, CATO, DEWA, GRSM, GWMP, HAFE, INDU, MANA, MIMA, MONO, NACE, ROCR, SACN, SHEN, STRI, WEFA | AAPR, CIPWG, DNREC, FC, FSAK, INPAWS, IPCNYS, KYEPPC, MDCES, MDDNR, MODOC, NHISC, NJDA, JS, NPSO, NWRA, PADCNR, PERT, TL, TNC, TNEPPC, VADCR, VTDEC, WI, WIDNR | Yes |
Allium vineale | field garlic, crow garlic, wild garlic | CT, MD, NC, NJ, PA, TN, VA, WV | ANTI, COLO, HAFE, MONO, STRI | CIPWG, FC, MDDNR, NJDA, JS, PERT, VADCR | Volunteer |
Alnus glutinosa | black alder; European alder | IL, IN, MI, NY, PA, WI | AAPR, FC, INPAWS, SR, WIDNR | Volunteer | |
Alopecurus myosuroides | slender meadow foxtail | OR, WA | PNWEPPC | Volunteer | |
Alpinia purpurata | red ginger | HI | HALE | JS | Volunteer |
Alternanthera philoxeroides | alligatorweed | GA, KY, IL, NC, SC, TX, VA | COLO | EU, FC, GAEPPC, GMRP, NCDPR, JS, TNC, VADCR | In Progress |
Alternanthera sessilis | sessile joyweed | HI | HALE | JS | Volunteer |
Amaranthus spinosus | spiny amaranth | HI, TN | HALE | JS | Volunteer |
Amaranthus viridis | slender amaranth | HI | HALE | JS | Volunteer |
Ammophila arenaria | European beach grass | CA, OR, WA | REDW | CAEPPC, FC, JS, PNWEPPC, TNC | Volunteer |
Ampelopsis brevipedunculata | Amur peppervine; porcelainberry | CT, DC, DE, MA, MD, NJ, NY, PA, RI, VA, WI, WV | CHOH, GWMP, MIMA, NACE, ROCR | CIPWG, CTDEP, DNREC, FC, IPCNYS, MD, MDCES, NJDA, JS, PADCNR, PERT, RINHS, TL, TNC, VADCR, WIDNR | Yes |
Anagallis arvensis | scarlet pimpernel; poor-man's weatherglass; shepherd's dock | AZ, CA, HI, NV | CHIR, DEVA, DEWA, HALE, LAME | JS | Volunteer |
Anchusa azurea | Italian bugloss | OR | NPSO | Volunteer | |
Andropogon virginicus | broomsedge bluestem | HI | HALE | JS, TNC, UHI | Volunteer |
Angiopteris evecta | oriental vessel fern | HI | HALE | JS, UHI | Volunteer |
Anthemis cotula | mayweed; stinking camomile; common dog fennel | CO, HI, TN | HALE, ROMO | JS | Volunteer |
Anthoxanthum odoratum | sweet vernal grass | DC, HI, MD, OR, WA | HALE, NACE, YELL | FC, JS, PNWEPPC, TNC, UHI | Volunteer |
Anthriscus sylvestris | wild chervil | OR, WA | PNWEPPC | Volunteer | |
Antigonon leptopus | coral vine; Mexican creeper, love vine, confederate vine | HI | HALE | FC, JS | Volunteer |
Apera interrupta | dense silkybent | OR, WA | YELL | FC, PNWEPPC | Volunteer |
Apium graveolens | celery | CA, UT | DEVA | JS | Volunteer |
Aralia elata | Japanese Angelica | PA | SR | Volunteer | |
Araujia sericifera | white bladder-flower | CA | SR | Volunteer | |
Arctium lappa | burdock; beggar's buttons, clotbur | SD | BADL | FC, JS, TNC | Volunteer |
Arctium minus | common burdock | CO, ID, IL, KY, MD, MI, OH, OR, PA, SC, TN, VA, WA, WI, WV, WY | BADL, CRMO, DINO, HAFE, MONO, SHEN, ROMO, THRO, YELL | AAPR, FC, KYEPPC, JS, PERT, PNWEPPC, TNC, WIDNR | Volunteer |
Ardisia crenata | coral ardisia; hen's eyes; coralberry | FL, TX | FC, FLEPPC, TNC, | In Progress | |
Ardisia elliptica | shoebutton ardisia | FL, HI | EVER, HALE | FC, FLEPPC, JS, SR, UHI | Volunteer |
Arenaria serpyllifolia | thyme-leaved sandwort | HI | HALE, YELL | JS | Volunteer |
Arrhenatherum elatius | tall oatgrass | CA, OR, TN, VA, WA | COLO, DEWA, REDW, YELL | FC, JS, PNWEPPC, TNC, VADCR | Volunteer |
Artemisia absinthium | absinthe; oldman; common wormwood; absinth sagewort | OR, ND, WA | THRO | PNWEPPC, TNC | In Progress |
Artemisia stelleriana | oldwoman | NJ | NJDA | Volunteer | |
Artemisia vulgaris | mugwort; common wormwood; felon herb | MD, NJ, NY, PA, TN, VA | COLO, NACE | FC, NJDA, JS, PERT, TNC, VADCR | Volunteer |
Arthraxon hispidus | small carpgrass | CT, KY, MD, PA, TN, VA, WV | COLO, HAFE, MONO, ROCR | CIPWG, FC, KYEPPC, MDDNR, JS, PERT, VADCR | Volunteer |
Arum italicum | Italian arum; Italian lords and ladies | OR | NPSO | Volunteer | |
Arundina graminifolia | bamboo orchid | HI | HALE | JS | Volunteer |
Arundo donax | giant reed; wild cane; cana brava; carrizo | AZ, CA, GA, MD, NM, NV, TX, VA | COLO, GRCA, LAME, SAAN, SEKI | AZJS, CAEPPC, FC, GAEPPC, JP, MDCES, JS, TNC, VADCR | Yes |
Asclepias curassavica | bloodflower; bloodflower milkweed; bastard ipecac | HI | HALE | JS | Volunteer |
Asparagus densiflorus | asparagus fern; Sprenger's asparagus fern | FL | FC, FLEPPC, | Volunteer | |
Asparagus officinalis | common asparagus; garden asparagus | AZ, SD, TN | CHIR | JS | Volunteer |
Asystasia gangetica | Chinese violet | HI | FC, UHI | Volunteer | |
Atriplex semibaccata | Australian saltbush | CA | CAEPPC, FC | Volunteer | |
Atriplex suberecta | peregrine saltbush | HI | HALE | JS | Volunteer |
Avena fatua | wild oats; Tartarian oats | AZ | ORPI | JS | Volunteer |
Avena sativa | oats | HI | HALE | FC, JS | Volunteer |
Axonopus compressus | broad-leaved carpetgrass | HI | HALE | JS | Volunteer |
Axonopus fissifolius | common carpetgrass | HI | HALE | UHI, JS | Volunteer |
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Last updated: 10-Apr-2007