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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Plant Conservation Aliance - Alien Plant Working Group's

Alien Plant Invaders of Natural Areas
By Scientific Name
Species beginning with the letter A
SCIENTIFIC NAME COMMON NAME STATES NATIONAL PARKS REFERENCE(S) FACT SHEET
Abrus precatorius rosary pea; crab's eyes FL   ABS, FC, FLEPPC Look-up Abrus precatorius on USDA PLANTS Volunteer
Abutilon grandifolium Hairy abutilon; ma'o HI HALE JS Look-up Abutilon grandifolium on USDA PLANTS Volunteer
Abutilon theophrasti velvetleaf; Indian mallow: butterprint; pie-maker MI, OR, VA, WA   AAPR, FC, JA, PNWEPPC Look-up Abutilon theophrasti on USDA PLANTS Volunteer
Acacia auriculiformis earleaf acacia FL   FC, FLEPPC, Look-up Acacia auriculiformis on USDA PLANTS In Progress
Acacia longifolia Sydney golden wattle CA, FL   SR Look-up Acacia longifolia on USDA PLANTS Volunteer
Acacia mearnsii black wattle HI HALE JS, TNC, UHI Look-up Acacia mearnsii on USDA PLANTS Volunteer
Acacia melanoxylon Australian blackwood; blackwood acacia CA, HI HALE FC, JS, SR, TNC, UHI Look-up Acacia melanoxylon on USDA PLANTS Volunteer
Acacia retinodes water wattle; wirilda CA, FL   SR Look-up Acacia retinodes on USDA PLANTS Volunteer
Acacia confusa small Philippine wattle HI   UHI Look-up Acacia confusa on USDA PLANTS Volunteer
Acer campestre hedge maple; field maple OH   SR Look-up Acer campestre on USDA PLANTS Volunteer
Acer ginnala Amur maple CT, IL, MA, MO, NY, VT, WI   CIPWG, EU, FC, MODOC, SR, WIDNR Look-up Acer ginnala on USDA PLANTS In Progress
Acer palmatum Japanese maple VA, DC ROCR JS Look-up Acer palmatum on USDA PLANTS 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 Look-up Acer platanoides on USDA PLANTS In Progress
Acer pseudoplatanus Sycamore maple; mock plane CT, PA   CIPWG, FC, PERT, PADCNR, TNC, Look-up Acer pseudoplatanus on USDA PLANTS 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 Look-up Acroptilon repens on USDA PLANTS Volunteer
Adenanthera pavonina red sandal wood, coralwood FL   FC, SR Look-up Adenanthera pavonina on USDA PLANTS Volunteer
Adiantum hispidulum rough maidenhair HI HALE JS Look-up Adiantum hispidulum on USDA PLANTS Volunteer
Adiantum raddianum Delta maidenhair HI HALE JS Look-up Adiantum raddianum on USDA PLANTS Volunteer
Aegilops cylindrica jointed goatgrass AZ, OK, OR, WA GRCA FC, JS, PNWEPPC, TNC Look-up Aegilops cylindrica on USDA PLANTS Volunteer
Aegopodium podagraria goutweed, bishop's weed, ground elder CT, MI, NJ, PA, VT, WI   AAPR, CIPWG, FC, NJDA, PERT, PADCNR, VTDEC, WIDNR Look-up Aegopodium podagraria on USDA PLANTS Yes
Aesculus hippocastanum horse chestnut GA, ME, OR, PA, WI   FC, NPSO, SR Look-up Aesculus hippocastanum on USDA PLANTS Volunteer
Agave sisalana hemp-plant; sisal hemp HI HALE FC, JS Look-up Agave sisalana on USDA PLANTS Volunteer
Ageratina adenophora sticky snakeroot; Crofton weed HI HALE FC, JS Look-up Ageratina adenophora on USDA PLANTS Volunteer
Ageratina riparia spreading snake-root; hamakua pa'makani HI HALE JS Look-up Ageratina riparia on USDA PLANTS Volunteer
Ageratum conyzoides maile-hohono HI HALE JS Look-up Ageratum conyzoides on USDA PLANTS Volunteer
Agropyron cristatum crested wheatgrass NV, UT LAME, THRO, YELL FC, JS Look-up Agropyron cristatum on USDA PLANTS Volunteer
Agrostis capillaris colonial beatgrass OR, TN, VA, WA   FC, JS, PNWEPPC, TNC, VADCR Look-up Agrostis capillaris on USDA PLANTS Volunteer
Agrostis gigantea redtop NY, OR, TN, VA COLO JS, TNC, VADCR Look-up Agrostis gigantea on USDA PLANTS Volunteer
Agrostis stolonifera creeping bentgrass AZ, CA, HI, NV, OR, TX, UT, WA DEVA, GLCA, HALE, LAME, YELL FC, JS, PNWEPPC Look-up Agrostis stolonifera on USDA PLANTS 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 Look-up Ailanthus altissima on USDA PLANTS Yes
Aira caryophyllea silver hairgrass CT, HI HALE, YELL CIPWG, JS Look-up Aira caryophyllea on USDA PLANTS Volunteer
Ajuga reptans creeping bugleweed; carpet bugleweed MD, TN, VA COLO MDCES, MDDNR, JS, VADCR Look-up Ajuga reptans on USDA PLANTS Volunteer
Akebia quinata five-leaf akebia; chocolate vine DC, MD, NJ, KY, PA, VA COLO, DEWA, ROCR KYEPPC, NJDA, JS, PADCNR, PERT, VADCR Look-up Akebia quinata on USDA PLANTS 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 Look-up Albizia julibrissin on USDA PLANTS Yes
Albizia lebbeck woman's tongue tree; lebbeck tree FL   FC, FLEPPC, SR, Look-up Albizia lebbeck on USDA PLANTS In Progress
Alcea rosea hollyhock CA DEVA JS Look-up Alcea rosea on USDA PLANTS Volunteer
Alhagi maurorum camel thorn AZ, CO, OR, UT, WA GLCA, GRCA, WUPA AZJS, FC, JS, PNWEPPC, TNC Look-up Alhagi maurorum on USDA PLANTS In Progress
Allamanda cathartica golden-trumpet; common allamanda FL   SR Look-up Allamanda cathartica on USDA PLANTS 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 Look-up Alliaria petiolata on USDA PLANTS 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 Look-up Allium vineale on USDA PLANTS Volunteer
Alnus glutinosa black alder; European alder IL, IN, MI, NY, PA, WI   AAPR, FC, INPAWS, SR, WIDNR Look-up Alnus glutinosa on USDA PLANTS Volunteer
Alopecurus myosuroides slender meadow foxtail OR, WA   PNWEPPC Look-up Alopecurus myosuroides on USDA PLANTS Volunteer
Alpinia purpurata red ginger HI HALE JS Look-up Alpinia purpurata on USDA PLANTS Volunteer
Alternanthera philoxeroides alligatorweed GA, KY, IL, NC, SC, TX, VA COLO EU, FC, GAEPPC, GMRP, NCDPR, JS, TNC, VADCR Look-up Alternanthera philoxeroides on USDA PLANTS In Progress
Alternanthera sessilis sessile joyweed HI HALE JS Look-up Alternanthera sessilis on USDA PLANTS Volunteer
Amaranthus spinosus spiny amaranth HI, TN HALE JS Look-up Amaranthus spinosus on USDA PLANTS Volunteer
Amaranthus viridis slender amaranth HI HALE JS Look-up Amaranthus viridis on USDA PLANTS Volunteer
Ammophila arenaria European beach grass CA, OR, WA REDW CAEPPC, FC, JS, PNWEPPC, TNC Look-up Ammophila arenaria on USDA PLANTS 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 Look-up Ampelopsis brevipedunculata on USDA PLANTS Yes
Anagallis arvensis scarlet pimpernel; poor-man's weatherglass; shepherd's dock AZ, CA, HI, NV CHIR, DEVA, DEWA, HALE, LAME JS Look-up Anagallis arvensis on USDA PLANTS Volunteer
Anchusa azurea Italian bugloss OR   NPSO Look-up Anchusa azurea on USDA PLANTS Volunteer
Andropogon virginicus broomsedge bluestem HI HALE JS, TNC, UHI Look-up Andropogon virginicus on USDA PLANTS Volunteer
Angiopteris evecta oriental vessel fern HI HALE JS, UHI Look-up Angiopteris evecta on USDA PLANTS Volunteer
Anthemis cotula mayweed; stinking camomile; common dog fennel CO, HI, TN HALE, ROMO JS Look-up Anthemis cotula on USDA PLANTS Volunteer
Anthoxanthum odoratum sweet vernal grass DC, HI, MD, OR, WA HALE, NACE, YELL FC, JS, PNWEPPC, TNC, UHI Look-up Anthoxanthum odoratum on USDA PLANTS Volunteer
Anthriscus sylvestris wild chervil OR, WA   PNWEPPC Look-up Anthriscus sylvestris on USDA PLANTS Volunteer
Antigonon leptopus coral vine; Mexican creeper, love vine, confederate vine HI HALE FC, JS Look-up Antigonon leptopus on USDA PLANTS Volunteer
Apera interrupta dense silkybent OR, WA YELL FC, PNWEPPC Look-up Apera interrupta on USDA PLANTS Volunteer
Apium graveolens celery CA, UT DEVA JS Look-up Apium graveolens on USDA PLANTS Volunteer
Aralia elata Japanese Angelica PA   SR Look-up Aralia elata on USDA PLANTS Volunteer
Araujia sericifera white bladder-flower CA   SR Look-up Araujia sericifera on USDA PLANTS Volunteer
Arctium lappa burdock; beggar's buttons, clotbur SD BADL FC, JS, TNC Look-up Arctium lappa on USDA PLANTS 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 Look-up Arctium minus on USDA PLANTS Volunteer
Ardisia crenata coral ardisia; hen's eyes; coralberry FL, TX   FC, FLEPPC, TNC, Look-up Ardisia crenata on USDA PLANTS In Progress
Ardisia elliptica shoebutton ardisia FL, HI EVER, HALE FC, FLEPPC, JS, SR, UHI Look-up Ardisia elliptica on USDA PLANTS Volunteer
Arenaria serpyllifolia thyme-leaved sandwort HI HALE, YELL JS Look-up Arenaria serpyllifolia on USDA PLANTS Volunteer
Arrhenatherum elatius tall oatgrass CA, OR, TN, VA, WA COLO, DEWA, REDW, YELL FC, JS, PNWEPPC, TNC, VADCR Look-up Arrhenatherum elatius on USDA PLANTS Volunteer
Artemisia absinthium absinthe; oldman; common wormwood; absinth sagewort OR, ND, WA THRO PNWEPPC, TNC Look-up Artemisia absinthium on USDA PLANTS In Progress
Artemisia stelleriana oldwoman NJ   NJDA Look-up Artemisia stelleriana on USDA PLANTS Volunteer
Artemisia vulgaris mugwort; common wormwood; felon herb MD, NJ, NY, PA, TN, VA COLO, NACE FC, NJDA, JS, PERT, TNC, VADCR Look-up Artemisia vulgaris on USDA PLANTS Volunteer
Arthraxon hispidus small carpgrass CT, KY, MD, PA, TN, VA, WV COLO, HAFE, MONO, ROCR CIPWG, FC, KYEPPC, MDDNR, JS, PERT, VADCR Look-up Arthraxon hispidus on USDA PLANTS Volunteer
Arum italicum Italian arum; Italian lords and ladies OR   NPSO Look-up Arum italicum on USDA PLANTS Volunteer
Arundina graminifolia bamboo orchid HI HALE JS Look-up Arundina graminifolia on USDA PLANTS 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 Look-up Arundo donax on USDA PLANTS Yes
Asclepias curassavica bloodflower; bloodflower milkweed; bastard ipecac HI HALE JS Look-up Asclepias curassavica on USDA PLANTS Volunteer
Asparagus densiflorus asparagus fern; Sprenger's asparagus fern FL   FC, FLEPPC, Look-up Asparagus densiflorus on USDA PLANTS Volunteer
Asparagus officinalis common asparagus; garden asparagus AZ, SD, TN CHIR JS Look-up Asparagus officinalis on USDA PLANTS Volunteer
Asystasia gangetica Chinese violet HI   FC, UHI Look-up Asystasia gangetica on USDA PLANTS Volunteer
Atriplex semibaccata Australian saltbush CA   CAEPPC, FC Look-up Atriplex semibaccata on USDA PLANTS Volunteer
Atriplex suberecta peregrine saltbush HI HALE JS Look-up Atriplex suberecta on USDA PLANTS Volunteer
Avena fatua wild oats; Tartarian oats AZ ORPI JS Look-up Avena fatua on USDA PLANTS Volunteer
Avena sativa oats HI HALE FC, JS Look-up Avena sativa on USDA PLANTS Volunteer
Axonopus compressus broad-leaved carpetgrass HI HALE JS Look-up Axonopus compressus on USDA PLANTS Volunteer
Axonopus fissifolius common carpetgrass HI HALE UHI, JS Look-up Axonopus fissifolius on USDA PLANTS Volunteer

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Last updated: 10-Apr-2007