Pennsylvania

• Adams 42001
  1,101 taxa Open ↗
• Allegheny 42003
  1,943 taxa Open ↗
• Armstrong 42005
  1,126 taxa Open ↗
• Beaver 42007
  1,402 taxa Open ↗
• Bedford 42009
  1,989 taxa Open ↗
• Berks 42011
  2,115 taxa Open ↗
• Blair 42013
  1,613 taxa Open ↗
• Bradford 42015
  1,111 taxa Open ↗
• Bucks 42017
  2,298 taxa Open ↗
• Butler 42019
  1,422 taxa Open ↗

Showing 751–800 of 1,109 (introduced).

• 
  Pisum sativum L. Introduced PISA6

  garden pea · Fabaceae 8 counties
• 
  Plantago arenaria Waldst. & Kit. Introduced PLAR6

  sand plantain · Plantaginaceae 3 counties
• 
  Plantago coronopus L. Introduced PLCO3

  buckhorn plantain · Plantaginaceae 1 county
• 
  Plantago lanceolata L. Introduced PLLA

  narrowleaf plantain · Plantaginaceae 67 counties
• 
  Plantago major L. Introduced PLMA2

  common plantain · Plantaginaceae 55 counties
• 
  Plantago media L. Introduced PLME

  hoary plantain · Plantaginaceae 3 counties
• 
  Platycodon grandiflorus (Jacq.) A. DC. Introduced PLGR7

  balloon-flower · Campanulaceae 3 counties
• 
  Poa annua L. Introduced POAN

  annual bluegrass · Poaceae 60 counties
• 
  Poa bulbosa L. Introduced POBU

  bulbous bluegrass · Poaceae 1 county
• 
  Poa compressa L. Introduced POCO

  Canada bluegrass · Poaceae 66 counties
• 
  Poa nemoralis L. ssp. nemoralis Introduced PONEN2

  wood bluegrass · Poaceae 9 counties
• 
  Poa pratensis L. ssp. pratensis Introduced POPRP2

  Kentucky bluegrass · Poaceae 63 counties
• 
  Poa trivialis L. Introduced POTR2

  rough bluegrass · Poaceae 57 counties
• 
  Polemonium caeruleum L. Introduced POCA2

  charity · Polemoniaceae 2 counties
• 
  Polycarpon tetraphyllum (L.) L. Introduced POTE

  fourleaf manyseed · Caryophyllaceae 2 counties
• 
  Polycarpon tetraphyllum (L.) L. ssp. tetraphyllum Introduced POTET2

  fourleaf manyseed · Caryophyllaceae 2 counties
• 
  Polygonum arenastrum Jord. ex Boreau Introduced POAR11

  oval-leaf knotweed · Polygonaceae 9 counties
• 
  Polygonum aviculare L. Introduced POAV

  prostrate knotweed · Polygonaceae 63 counties
• 
  Polygonum baldschuanicum Regel Introduced POBA3

  Bukhara fleeceflower · Polygonaceae 4 counties
• 
  Polygonum bellardii All. Introduced POBE

  narrowleaf knotweed · Polygonaceae 10 counties
• 
  Polygonum cespitosum Blume var. cespitosum Introduced POCEC

  Oriental lady's thumb · Polygonaceae 8 counties
• 
  Polygonum cespitosum Blume var. longisetum (Bruijn) A.N. Steward Introduced POCEL

  Oriental lady's thumb · Polygonaceae 40 counties
• 
  Polygonum cespitosum Blume, nom. inq. Introduced POCE4

  Oriental lady's thumb · Polygonaceae 42 counties
• 
  Polygonum convolvulus L. Introduced POCO10

  black bindweed · Polygonaceae 63 counties
• 
  Polygonum convolvulus L. var. convolvulus Introduced POCOC2

  black bindweed · Polygonaceae 1 county
• 
  Polygonum cuspidatum Siebold & Zucc. Introduced POCU6

  Japanese knotweed · Polygonaceae 43 counties
• 
  Polygonum extremiorientale Vorosch. Introduced POEX2

  far-eastern smartweed · Polygonaceae 1 county
• 
  Polygonum hydropiper L. Introduced POHY

  marshpepper knotweed · Polygonaceae 64 counties
• 
  Polygonum minus Huds. Introduced POMI21

  pygmy smartweed · Polygonaceae 1 county
• 
  Polygonum nepalense Meisn. Introduced PONE9

  Nepalese smartweed · Polygonaceae 2 counties
• 
  Polygonum orientale L. Introduced POOR2

  kiss me over the garden gate · Polygonaceae 31 counties
• 
  Polygonum perfoliatum L. Introduced POPE10

  Asiatic tearthumb · Polygonaceae 10 counties
• 
  Polygonum persicaria L. Introduced POPE3

  spotted ladysthumb · Polygonaceae 62 counties
• 
  Polygonum sachalinense F. Schmidt ex Maxim. Introduced POSA4

  giant knotweed · Polygonaceae 23 counties
• 
  Polygonum scandens L. var. dumetorum (L.) Gleason Introduced POSCD

  climbing false buckwheat · Polygonaceae 3 counties
• 
  Polypogon monspeliensis (L.) Desf. Introduced POMO5

  annual rabbitsfoot grass · Poaceae 2 counties
• 
  Poncirus trifoliata (L.) Raf. Introduced POTR4

  hardy orange · Rutaceae 7 counties
• 
  Populus alba L. Introduced POAL7

  white poplar · Salicaceae 27 counties
• 
  Populus nigra L. Introduced PONI

  Lombardy poplar · Salicaceae 5 counties
• ⚘
  Populus ×canescens (Aiton) Sm. (pro sp.) [alba × tremula] Introduced POCA14

  gray poplar · Salicaceae 7 counties
• 
  Portulaca grandiflora Hook. Introduced POGR7

  rose moss · Portulacaceae 10 counties
• 
  Potamogeton crispus L. Introduced POCR3

  curly pondweed · Potamogetonaceae 38 counties
• 
  Potentilla anglica Laicharding Introduced POAN7

  English cinquefoil · Rosaceae 1 county
• 
  Potentilla argentea L. Introduced POAR8

  silver cinquefoil · Rosaceae 27 counties
• 
  Potentilla argentea L. var. argentea Introduced POARA3

  silver cinquefoil · Rosaceae 27 counties
• 
  Potentilla intermedia L. Introduced POIN8

  downy cinquefoil · Rosaceae 8 counties
• 
  Potentilla recta L. Introduced PORE5

  sulphur cinquefoil · Rosaceae 65 counties
• 
  Potentilla reptans L. Introduced PORE6

  creeping cinquefoil · Rosaceae 5 counties
• 
  Prunella laciniata (L.) L. Introduced PRLA7

  cutleaf selfheal · Lamiaceae 4 counties
• 
  Prunus armeniaca L. Introduced PRAR3

  apricot · Rosaceae 3 counties