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 P
SCIENTIFIC NAME COMMON NAME STATES NATIONAL PARKS REFERENCE(S) FACT SHEET
Pachysandra terminalis Japanese spurge; Japanese pachysandra VA, DC ROCR FC, JS, TNC Look-up Pachysandra terminalis on USDA PLANTS Volunteer
Paederia cruddasiana sewer vine FL   FC , FLEPPC Look-up Paederia cruddasiana on USDA PLANTS Volunteer
Paederia foetida skunk vine FL, HI   FC, FLEPPC, HEAR, TNC Look-up Paederia foetida on USDA PLANTS Volunteer
Panicum antidotale blue panicum AZ ORPI JS Look-up Panicum antidotale on USDA PLANTS Volunteer
Panicum repens torpedo grass FL, GA, TX   ABS, FC, FLEPPC, GAEPPC, TNC Look-up Panicum repens on USDA PLANTS In Progress
Paraserianthes lophantha plume-albizia CA   SR Look-up Paraserianthes lophantha on USDA PLANTS Volunteer
Parentucellia viscosa yellow glandweed CA, HI, OR, WA HALE FC, JS, PNWEPPC, TNC Look-up Parentucellia viscosa on USDA PLANTS Volunteer
Parthenocissus tricuspidata Boston ivy CA   SR Look-up Parthenocissus tricuspidata on USDA PLANTS Volunteer
Paspalum conjugatum hilograss HI HALE UHI, JS, TNC Look-up Paspalum conjugatum on USDA PLANTS Volunteer
Paspalum dilatatum dallis grass CA, HI, MD, TN, TX DEVA, HALE, MONO JS, UHI Look-up Paspalum dilatatum on USDA PLANTS Volunteer
Paspalum fimbriatum fimbriate paspalum; Panama crowngrass HI   UHI Look-up Paspalum fimbriatum on USDA PLANTS Volunteer
Paspalum notatum Bahia grass FL   FC, TNC Look-up Paspalum notatum on USDA PLANTS Volunteer
Paspalum scrobiculatum ricegrass; mau'u-laiki HI HALE JS Look-up Paspalum scrobiculatum on USDA PLANTS Volunteer
Paspalum urvillei Vasey's grass HI HALE UHI, JS Look-up Paspalum urvillei on USDA PLANTS Volunteer
Passiflora bicornis wingleaf passion flower HI HALE JS Look-up Passiflora bicornis on USDA PLANTS Volunteer
Passiflora edulis purple granadilla HI HALE UHI, JS, TNC Look-up Passiflora edulis on USDA PLANTS Volunteer
Passiflora foetida stinking passion flower, runningpop HI HALE FC, JS Look-up Passiflora foetida on USDA PLANTS Volunteer
Passiflora laurifolia golden bellapple HI   UHI Look-up Passiflora laurifolia on USDA PLANTS Volunteer
Passiflora ligularis sweet granadilla HI   UHI Look-up Passiflora ligularis on USDA PLANTS Volunteer
Passiflora mollissima Banana poka HI   NWRA, TNC, UHI Look-up Passiflora mollissima on USDA PLANTS Volunteer
Passiflora suberosa corkystem passionflower HI   TNC, UHI Look-up Passiflora suberosa on USDA PLANTS Volunteer
Passiflora subpeltata white passionflower HI HALE JS Look-up Passiflora subpeltata on USDA PLANTS Volunteer
Pastinaca sativa wild parsnip MI, OH, PA, TN, VA, WI COLO, YELL AAPR, FC, JS, PADCNR, TNC, VADCR, WI, WIDNR Look-up Pastinaca sativa on USDA PLANTS Volunteer
Paulownia tomentosa princess tree; empress tree CT, DC, GA, KY, LA, MD, NC, NJ, OR, PA, TN, VA, WV ANTI, APCO, BLRI, CHOH, COLO, GETT, GEWA, GRSM, HAFE, MONO, PETE, PRWI, RICH, O704ROCR, SHEN CIPWG, FC, GAEPPC, KYEPPC, MDDNR, NCDPR, NJDA, JS, NPSO, PADCNR, SR, TNC, TNEPPC, VADCR Look-up Paulownia tomentosa on USDA PLANTS Yes
Pavonia hastata spearleaf swamp mallow FL, GA   SR Look-up Pavonia hastata on USDA PLANTS Volunteer
Pavonia spinifex gingerbush FL, GA   SR Look-up Pavonia spinifex on USDA PLANTS Volunteer
Peganum harmala African rue OR, WA   FC, PNWEPPC Look-up Peganum harmala on USDA PLANTS Volunteer
Pennisetum ciliare var. ciliare buffelgrass HI, TX   JP, UHI Look-up Pennisetum ciliare var. ciliare on USDA PLANTS Volunteer
Pennisetum ciliare buffelgrass AZ, TX CHIR, ORPI AZJS, EU, JS Look-up Pennisetum ciliare on USDA PLANTS Volunteer
Pennisetum clandestinum kikuyugrass HI HALE JS, TNC, UHI Look-up Pennisetum clandestinum on USDA PLANTS Volunteer
Pennisetum glaucum pearl millet, yellow foxtail AZ, CA, IL, SD, WV BADL, DEVA, GRCA, HAFE, MANA, THRO EU, JS Look-up Pennisetum glaucum on USDA PLANTS Volunteer
Pennisetum purpureum elephant gras; Napier grass FL, HI HALE FC, FLEPPC, JS, Look-up Pennisetum purpureum on USDA PLANTS Volunteer
Pennisetum setaceum crimson fountaingrass AZ, CA, HI, NV CHIR, LAME, ORPI AZJS, CAEPPC, FC, JS, UHI Look-up Pennisetum setaceum on USDA PLANTS Yes
Perilla frutescens beefsteak plant DC, IL, MD, MO, PA, TN, VA, WV ANTI, CATO, COLO, HAFE, MANA, MONO, ROCR, SHEN, STRI EU, FC, MDCES, MDDNR, MODOC, PADCNR, JS, VADCR Look-up Perilla frutescens on USDA PLANTS Volunteer
Persea americana avocado HI HALE JS Look-up Persea americana on USDA PLANTS Volunteer
Petrorhagia dubia childing pink HI HALE JS Look-up Petrorhagia dubia on USDA PLANTS Volunteer
Petroselinum crispum parsley HI HALE JS Look-up Petroselinum crispum on USDA PLANTS Volunteer
Phalaris aquatica Harding grass HI, OR HALE FC, JS, NPSO Look-up Phalaris aquatica on USDA PLANTS Volunteer
Phalaris arundinacea reed canary grass AK, CO, CT, DE, ID, IL, IN, KY, MA, MD, MI, MO, MT, NC, NJ, NY, OH, OR, PA, TN, VA, WA, WI BLRI, CUYA, INDU, MIMA, ROMO, SACN JS Look-up Phalaris arundinacea on USDA PLANTS In Progress
Phalaris canariensis canary grass CA, MI DEVA, GRSM AAPR, JS Look-up Phalaris canariensis on USDA PLANTS Volunteer
Phalaris minor littleseed canarygrass AZ ORPI JS Look-up Phalaris minor on USDA PLANTS Volunteer
Phellodendron amurense Amur cork tree IL, MA, NY, PA, VA   EU, PERT, VADCR? Look-up Phellodendron amurense on USDA PLANTS In Progress
Phellodendron japonicum Japanese corktree NJ   NJDA Look-up Phellodendron japonicum on USDA PLANTS Volunteer
Phlebodium aureum laua'e-haole HI HALE JS Look-up Phlebodium aureum on USDA PLANTS Volunteer
Phleum pratense Timothy grass AZ, MD, MI, OH, OR, SD, TN, UT, VA, WA, WY ANTI, BADL, COLO, GRCA, YELL AAPR, FC, JS, PNWEPPC, TNC, VADCR Look-up Phleum pratense on USDA PLANTS Volunteer
Phoenix dactylifera date palm CA, NV DEVA, GRCA, LAME JS Look-up Phoenix dactylifera on USDA PLANTS Volunteer
Phoenix reclinata reclining date palm; Senegal date palm FL   TNC, FC Look-up Phoenix reclinata on USDA PLANTS Volunteer
Phormium tenax New Zealand flax HI   TNC, UHI Look-up Phormium tenax on USDA PLANTS Volunteer
Phragmites australis common reed; phragmites CO, CT, DC, DE, GA, IN, KY, MD, MI, NC, NH, NJ, NY, OH, PA, TN, VA, VT, WI COLO, CUYA, DINO, GEWA, GWMP, INDU, NACE AAPR, CIPWG, GAEPPC, INPAWS, IPCNYS, KYEPPC, MDCES, MDDNR, NCDPR, NHISC, NJDA, JS, NWRA, PADCNR, PERT, TNEPPC, VADCR, VTDEC, WIDNR Look-up Phragmites australis on USDA PLANTS Yes
Phyllostachys aurea golden bamboo, running bamboo GA, MD, PA, VA, WV COLO, HAFE GAEPPC, MDCES, MDDNR, JS, PERT, VADCR Look-up Phyllostachys aurea on USDA PLANTS Volunteer
Phymatosorus scolopendria wart fern HI HALE JS Look-up Phymatosorus scolopendria on USDA PLANTS Volunteer
Physalis peruviana Peruvian ground- cherry HI HALE JS Look-up Physalis peruviana on USDA PLANTS Volunteer
Physalis virginiana var. virginiana Virginia groundcherry CA DEVA JS Look-up Physalis virginiana var. virginiana on USDA PLANTS Volunteer
Picea abies Norway spruce HI, MD, TN GRSM, HALE, MONO JS, SR Look-up Picea abies on USDA PLANTS Volunteer
Picris hieracioides hawkweed ox-tongue OR, WA   PNWEPPC Look-up Picris hieracioides on USDA PLANTS Volunteer
Pilea microphylla rockweed; artillery plant HI HALE JS Look-up Pilea microphylla on USDA PLANTS Volunteer
Pinus contorta var. latifolia lodgepole pine HI HALE JS Look-up Pinus contorta var. latifolia on USDA PLANTS Volunteer
Pinus coulteri Coulter pine HI HALE JS Look-up Pinus coulteri on USDA PLANTS Volunteer
Pinus elliottii var. elliottii Caribbean pine HI   UHI Look-up Pinus elliottii var. elliottii on USDA PLANTS Volunteer
Pinus jeffreyi Jeffrey pine HI HALE JS Look-up Pinus jeffreyi on USDA PLANTS Volunteer
Pinus pinaster cluster pine; maritime pine HI HALE UHI, JS Look-up Pinus pinaster on USDA PLANTS Volunteer
Pinus pinea Italian stone pine CA   FC, TNC Look-up Pinus pinea on USDA PLANTS Volunteer
Pinus ponderosa Ponderosa pine HI HALE JS Look-up Pinus ponderosa on USDA PLANTS Volunteer
Pinus radiata Monterey pine HI HALE JS Look-up Pinus radiata on USDA PLANTS Volunteer
Pinus strobus white pine HI HALE JS Look-up Pinus strobus on USDA PLANTS Volunteer
Pinus sylvestris Scotch pine; scots pine HI, IA, MA, ME, NJ, NY, OH, PA, VT, WI HALE JS, SR, UHI, WIDNR Look-up Pinus sylvestris on USDA PLANTS Volunteer
Pinus thunbergii black pine DE, RI, VA COLO DNREC, JS, PERT, VADCR Look-up Pinus thunbergii on USDA PLANTS Volunteer
Pistia stratiotes Nile cabbage; water lettuce DE, FL, TX   DE, FC, FLEPPC, TNC Look-up Pistia stratiotes on USDA PLANTS Volunteer
Pithecellobium dulce blackbead; guayamochil; Madras thorn; monkeypod FL, HI   UHI, SR Look-up Pithecellobium dulce on USDA PLANTS Volunteer
Pittosporum undulatum Australian cheesewood CA   SR Look-up Pittosporum undulatum on USDA PLANTS Volunteer
Pityrogramma calomelanos Dixie silver-back fern HI HALE JS Look-up Pityrogramma calomelanos on USDA PLANTS Volunteer
Plantago australis dwarf plantain HI HALE JS Look-up Plantago australis on USDA PLANTS Volunteer
Plantago lanceolata English plantain; lance-leaved plantain AZ, CA, HI, MD, MI, NJ, TN, UT, VA DEVA, HALE, MONO, YELL AAPR, NJDA, JS Look-up Plantago lanceolata on USDA PLANTS Volunteer
Plantago major common plantain; broad-leaved plantain AZ, CA, HI, MD, MI, NJ, TN, UT, VA ANTI, CHIR, DEVA, HALE, MONO, YELL AAPR, NJDA, JS Look-up Plantago major on USDA PLANTS Volunteer
Pluchea carolinensis cure-for-all; sepi; sourbush HI HALE JS, UHI Look-up Pluchea carolinensis on USDA PLANTS Volunteer
Pluchea indica Indian camphorweed HI   UHI Look-up Pluchea indica on USDA PLANTS Volunteer
Poa annua annual bluegrass AZ, CA, HI, MI, TN, UT DEVA, FOBO, HALE, YELL AAPR, JS Look-up Poa annua on USDA PLANTS Volunteer
Poa bulbosa bulbous bluegrass MI YELL AAPR Look-up Poa bulbosa on USDA PLANTS Volunteer
Poa compressa Canada bluegrass CA, CT, MI, NE, OR, PA, TN, VA, WA, WI, WV DEVA, COLO, HAFE, YELL AAPR, CIPWG, FC, JS, PNWEPPC, TL, TNC, VADCR, WIDNR Look-up Poa compressa on USDA PLANTS Volunteer
Poa trivialis rough bluegrass VA COLO JS, VADCR Look-up Poa trivialis on USDA PLANTS Volunteer
Polycarpon tetraphyllum fourleaf manyseed HI HALE JS Look-up Polycarpon tetraphyllum on USDA PLANTS Volunteer
Polygonum argyrocoleon silver-sheathed knotweed CA, NV DEVA, LAME JS Look-up Polygonum argyrocoleon on USDA PLANTS Volunteer
Polygonum caespitosum Oriental lady's thumb CT, KY, MD, MI, TN, VA, WV ANTI, COLO, HAFE, RICH, SHEN, STRI AAPR, CIPWG, FC, KYEPPC, JS, VADCR Look-up Polygonum caespitosum on USDA PLANTS Volunteer
Polygonum capitatum pinkhead smartweed HI HALE JS Look-up Polygonum capitatum on USDA PLANTS Volunteer
Polygonum convolvulus black bindweed AZ, HI, MI, SD BADL, FOBO, HALE AAPR, JS Look-up Polygonum convolvulus on USDA PLANTS Volunteer
Polygonum cuspidatum Japanese knotweed; Mexican bamboo AK, CT, DC, DE, GA, IN, MA, MD, ME, MI, MO, NC, NH, NJ, NY, OH, OR, PA, RI, TN, VA, VT, WA, WI, WV ACAD, BLRI, CHOH, COLO, CUYA, DEWA, GRSM, INDU, MONO, NACE, PETE, PRWI, ROCR, SHEN, STRI AAPR, CIPWG, DNREC, EU, FC, FSAK, GAEPPC, INPAWS, IPCNYS, KYEPPC, MDCES, MDDNR, MODOC, NHISC, NJDA, JS, NPSO, NWRA, PNWEPPC, PADCNR, PERT, RINHS, TL, TNC, TNEPPC, VADCR, VTDEC, WI, WIDNR Look-up Polygonum cuspidatum on USDA PLANTS Yes
Polygonum densiflorum dense-flpwer knotweed; kamole HI HALE JS Look-up Polygonum densiflorum on USDA PLANTS Volunteer
Polygonum lapathifolium curlytop knotweed TX, UT YELL JS Look-up Polygonum lapathifolium on USDA PLANTS Volunteer
Polygonum orientale kiss-me-over-the-garden-gate; prince's-feather; princess feather MI, NJ   AAPR, NJDA Look-up Polygonum orientale on USDA PLANTS Volunteer
Polygonum perfoliatum Asiatic tearthumb; Devil's-tail tearthumb; mile-a-minute vine; mile-a-minute weed CT, DC, DE, MA, MD, NJ, NY, PA, VA, WV CATO, GWMP, HAFE, MIMA, MONO, NACE, ROCR, SHEN, THST CIPWG, DNREC, FC, IPCNYS, MDCES, MDDNR, NJDA, JS, PADCNR, PERT, TL, VADCR, WIDNR Look-up Polygonum perfoliatum on USDA PLANTS Yes
Polygonum persicaria spotted ladysthumb KY, MD, MI, TN, UT, VA ANTI, MONO, SHEN, STRI AAPR, KYEPPC, JS Look-up Polygonum persicaria on USDA PLANTS Volunteer
Polygonum polystachyum cultivated knotweed; Himalyan knotweed OR, WA   FC, PNWEPPC Look-up Polygonum polystachyum on USDA PLANTS Volunteer
Polygonum punctatum dotted smartweed HI HALE JS Look-up Polygonum punctatum on USDA PLANTS Volunteer
Polygonum sachalinense giant knotweed; Sakhalian knotweed IL, MD, MI, NC, OR, RI, WA, WI BLRI AAPR, EU, FC, MDDNR, JS, NPSO, PNWEPPC, RINHS, WIDNR Look-up Polygonum sachalinense on USDA PLANTS Volunteer
Polypogon monspeliensis rabbitfoot grass AZ, NV, UT CHIR, LAME, ORPI, YELL JS Look-up Polypogon monspeliensis on USDA PLANTS Volunteer
Polypogon viridis beardless rabbit's- foot grass; water bentgrass AZ, CA, TX, UT CHIR, DEVA, FOBO, LAME, ORPI JS Look-up Polypogon viridis on USDA PLANTS Volunteer
Poncirus trifoliata trifoliate orange; hardy orange FL, GA, LA, MS, SC, TX, WV VICK SR Look-up Poncirus trifoliata on USDA PLANTS Volunteer
Populus alba white poplar CO, CT, DC, GA, IL, IN, KY, MA, MD, MI, MO, MT, NV, OH, OR, PA, SC, TN, VA, VT, WA, WI, WY COLO, DINO, GRSM, KIMO, PETE AAPR, CIPWG, FC, KYEPPC, MDDNR, JS, PERT, PNWEPPC, SR, TNC, VADCR, VTDEC, WIDNR Look-up Populus alba on USDA PLANTS Yes
Populus balsamifera balsam poplar; balm of Gilead TN   JS Look-up Populus balsamifera on USDA PLANTS Volunteer
Populus nigra black poplar; Lombardy poplar MI, ND   AAPR, FC, SR, TNC Look-up Populus nigra on USDA PLANTS Volunteer
Populus tremula European aspen MS   SR Look-up Populus tremula on USDA PLANTS Volunteer
Populus x canescens gray poplar MS, WI   SR Look-up Populus x canescens on USDA PLANTS Volunteer
Portulaca oleracea common purslane; little hogweed AZ, CA, HI, IL, NV, TN, UT CHIR, DEVA, HALE, LAME, YELL EU, FC, JS Look-up Portulaca oleracea on USDA PLANTS Volunteer
Potamogeton crispus curly-leaf pondweed AZ, CT, NH, NJ, NV, NY, VT, WI LAME CT, FC, IPCNYS, NHISC, NJDA, JS, VTDEC, WI, WIDNR Look-up Potamogeton crispus on USDA PLANTS Volunteer
Potentilla recta sulfur cinquefoil CO, ID, MD, MT, OR, WA, WY MONO, ROMO, YELL FC, JS, PNWEPPC, TNC Look-up Potentilla recta on USDA PLANTS Volunteer
Pouteria campechiana canistel; eggfruit tree FL   SR Look-up Pouteria campechiana on USDA PLANTS Volunteer
Prosopis pallida algarrabo; kiawe HI   UHI Look-up Prosopis pallida on USDA PLANTS Volunteer
Prunella vulgaris self-heal HI, MI HALE AAPR, JS Look-up Prunella vulgaris on USDA PLANTS Volunteer
Prunus avium bird cherry DE, MA, MD, NC, NJ, NY, OR, PA, RI, TN, VA, WA MANA FC, MDDNR, JS, NPSO, PNWEPPC, PERT, SR, TNC Look-up Prunus avium on USDA PLANTS Volunteer
Prunus cerasifera cherry plum OR   NPSO Look-up Prunus cerasifera on USDA PLANTS Volunteer
Prunus cerasus sour cherry CA, KY, MD, NC, NY, OR, WA, WV   FC, PNWEPPC, SR Look-up Prunus cerasus on USDA PLANTS Volunteer
Prunus domestica garden plum; European plum IN, MI, OR   NPSO, SR Look-up Prunus domestica on USDA PLANTS Volunteer
Prunus laurocerasus cherry-laurel OR, WA   FC, NPSO, PNWEPPC, SR Look-up Prunus laurocerasus on USDA PLANTS Volunteer
Prunus lusitanica Portugal laurel OR, WA   NPSO, SR Look-up Prunus lusitanica on USDA PLANTS Volunteer
Prunus mahaleb Mahaleb cherry; perfumed cherry DC, ID, IL, MO, OR, PA, WA   FC, MODOC, PNWEPPC, SR Look-up Prunus mahaleb on USDA PLANTS Volunteer
Prunus padus European bird-cherry AK, AL, PA   FSAK, SR Look-up Prunus padus on USDA PLANTS Volunteer
Prunus persica peach AR, CA, FL, GA, IL, KY, LA, MD, MS, NC, SC, TN, VA   SR Look-up Prunus persica on USDA PLANTS Volunteer
Prunus spinosa blackthorn OR   NPSO Look-up Prunus spinosa on USDA PLANTS Volunteer
Pseudelephantopus spicatus dog's-tongue HI HALE JS Look-up Pseudelephantopus spicatus on USDA PLANTS Volunteer
Pseudognaphalium luteoalbum Jersey rabbit-tobacco, Jersey cudweed NV LAME JS Look-up Pseudognaphalium luteoalbum on USDA PLANTS Volunteer
Pseudosasa japonica arrow bamboo MD, PA, WV HAFE MDDNR, PERT Look-up Pseudosasa japonica on USDA PLANTS Volunteer
Pseudotsuga menziesii Douglas fir HI HALE JS Look-up Pseudotsuga menziesii on USDA PLANTS Volunteer
Psidium cattleianum strawberry guava FL, HI HALE ABS, FC, FLEPPC, JS, UHI, TNC Look-up Psidium cattleianum on USDA PLANTS Yes
Psidium guajava common guava FL, HI HALE ABS, FC, FLEPPC, JS, SR, TNC, UHI Look-up Psidium guajava on USDA PLANTS Volunteer
Pueraria montana var. lobata kudzu-vine AR, CT, DC, DE, FL, GA, IL, IN, KY, MD, MO, MS, NC, ND, NJ, OR, PA, SC, TN, TX, VA, WV BLRI, BOWA, CHOH, COLO, GRSM, HAFE, KIMO, NACE, ROCR, SHEN, THRO, VICK CIPWG, DNREC, FC, FLEPPC, GAEPPC, GMRP, INPAWS, KYEPPC, MDCES, MDDNR, MODOC, NCDPR, NJDA, JS, NPSO, PADCNR, TL, TNC, TNEPPC, VADCR Look-up Pueraria montana var. lobata on USDA PLANTS Yes
Punica granatum pomegranate CA   SR Look-up Punica granatum on USDA PLANTS Volunteer
Pyracantha angustifolia narrowleaf firethorn CA, HI, OR   NPSO, SR, UHI Look-up Pyracantha angustifolia on USDA PLANTS Volunteer
Pyracantha coccinea scarlet firethorn OR   NPSO Look-up Pyracantha coccinea on USDA PLANTS Volunteer
Pyrus calleryana Bradford pear, Callery pear IL, MD, PA STRI EU, MDCES, PADCNR Look-up Pyrus calleryana on USDA PLANTS Volunteer
Pyrus communis common pear OR   TNC Look-up Pyrus communis on USDA PLANTS Volunteer

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Last updated: 25-Feb-2008