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 701–750 of 1,109 (introduced).

• 
  Paeonia lactiflora Pall. Introduced PALA27

  Chinese peony · Paeoniaceae 5 counties
• 
  Panicum bisulcatum Thunb. Introduced PABI80

  Japanese panicgrass · Poaceae 1 county
• 
  Panicum miliaceum L. Introduced PAMI2

  proso millet · Poaceae 18 counties
• 
  Panicum miliaceum L. ssp. miliaceum Introduced PAMIM

  broomcorn millet · Poaceae 18 counties
• 
  Papaver argemone L. Introduced PAAR3

  long pricklyhead poppy · Papaveraceae 2 counties
• 
  Papaver dubium L. Introduced PADU

  blindeyes · Papaveraceae 13 counties
• 
  Papaver hybridum L. Introduced PAHY3

  round pricklyhead poppy · Papaveraceae 1 county
• 
  Papaver orientale L. Introduced PAOR5

  Oriental poppy · Papaveraceae 4 counties
• 
  Papaver rhoeas L. Introduced PARH2

  corn poppy · Papaveraceae 12 counties
• 
  Papaver somniferum L. Introduced PASO2

  opium poppy · Papaveraceae 13 counties
• 
  Parapholis incurva (L.) C.E. Hubbard Introduced PAIN

  curved sicklegrass · Poaceae 1 county
• 
  Parietaria judaica L. Introduced PAJU

  spreading pellitory · Urticaceae 1 county
• 
  Parthenium hysterophorus L. Introduced PAHY

  Santa Maria feverfew · Asteraceae 2 counties
• 
  Parthenocissus tricuspidata (Siebold & Zucc.) Planch. Introduced PATR6

  Boston ivy · Vitaceae 10 counties
• 
  Pastinaca sativa L. Introduced PASA2

  wild parsnip · Apiaceae 64 counties
• 
  Paulownia tomentosa (Thunb.) Siebold & Zucc. ex Steud. Introduced PATO2

  princesstree · Scrophulariaceae 13 counties
• 
  Pennisetum alopecuroides (L.) Spreng. Introduced PEAL

  Chinese fountaingrass · Poaceae 2 counties
• 
  Pennisetum glaucum (L.) R. Br. Introduced PEGL2

  pearl millet · Poaceae 66 counties
• 
  Perilla frutescens (L.) Britton Introduced PEFR4

  beefsteakplant · Lamiaceae 20 counties
• 
  Perilla frutescens (L.) Britton var. frutescens Introduced PEFRF2

  beefsteakplant · Lamiaceae 1 county
• 
  Periploca graeca L. Introduced PEGR9

  silkvine · Asclepiadaceae 2 counties
• 
  Petasites hybridus (L.) G. Gaertn., B. Mey. & Scherb. Introduced PEHY

  pestilence wort · Asteraceae 7 counties
• 
  Petrorhagia prolifera (L.) P.W. Ball & Heywood Introduced PEPR4

  childing pink · Caryophyllaceae 3 counties
• 
  Petrorhagia saxifraga (L.) Link Introduced PESA9

  saxifrage pink · Caryophyllaceae 3 counties
• 
  Petroselinum crispum (Mill.) Nyman ex A.W. Hill Introduced PECR2

  parsley · Apiaceae 2 counties
• 
  Petunia axillaris (Lam.) Britton, Sterns & Poggenb. Introduced PEAX

  large white petunia · Solanaceae 1 county
• ⚘
  Petunia ×atkinsiana D. Don ex Loudon [axillaris × integrifolia] Introduced PEAT7

  petunia · Solanaceae 18 counties
• 
  Peucedanum ostruthium (L.) W.D.J. Koch Introduced PEOS2

  masterwort · Apiaceae 3 counties
• 
  Phalaris canariensis L. Introduced PHCA5

  annual canarygrass · Poaceae 16 counties
• 
  Phalaris paradoxa L. Introduced PHPA5

  hood canarygrass · Poaceae 2 counties
• 
  Phedimus aizoon (L.) 't Hart Introduced PHAI

  Orpin aizoon · Crassulaceae 3 counties
• 
  Phedimus spurius (M. Bieb.) 't Hart Introduced PHSP9

  Caucasian stonecrop · Crassulaceae 6 counties
• 
  Phellodendron japonicum Maxim. Introduced PHJA

  Japanese corktree · Rutaceae 1 county
• 
  Philadelphus coronarius L. Introduced PHCO7

  sweet mock orange · Hydrangeaceae 18 counties
• 
  Phleum pratense L. Introduced PHPR3

  timothy · Poaceae 67 counties
• 
  Phleum subulatum (Savi) Asch. & Graebn. Introduced PHSU2

  Italian timothy · Poaceae 1 county
• 
  Photinia villosa (Thunb.) DC. Introduced PHVI81

  Oriental photinia · Rosaceae 2 counties
• 
  Phragmites australis (Cav.) Trin. ex Steud. ssp. australis Introduced PHAUA7

  European common reed · Poaceae 6 counties
• 
  Physalis alkekengi L. Introduced PHAL5

  strawberry groundcherry · Solanaceae 16 counties
• 
  Physalis philadelphica Lam. Introduced PHPH2

  Mexican groundcherry · Solanaceae 3 counties
• 
  Physalis philadelphica Lam. var. immaculata Waterf. Introduced PHPHI

  Mexican groundcherry · Solanaceae 3 counties
• 
  Picea abies (L.) Karst. Introduced PIAB

  Norway spruce · Pinaceae 14 counties
• 
  Picris echioides L. Introduced PIEC

  bristly oxtongue · Asteraceae 3 counties
• 
  Picris hieracioides L. ssp. hieracioides Introduced PIHIH

  hawkweed oxtongue · Asteraceae 16 counties
• 
  Pimpinella major (L.) Huds. Introduced PIMA6

  hollowstem burnet saxifrage · Apiaceae 1 county
• 
  Pimpinella saxifraga L. Introduced PISA

  solidstem burnet saxifrage · Apiaceae 16 counties
• 
  Pimpinella saxifraga L. ssp. saxifraga Introduced PISAS

  solidstem burnet saxifrage · Apiaceae 16 counties
• 
  Pinellia ternata (Thunb.) Makino ex Breitenbach Introduced PITE

  crowdipper · Araceae 3 counties
• 
  Pinus nigra Arnold Introduced PINI

  Austrian pine · Pinaceae 12 counties
• 
  Pinus sylvestris L. Introduced PISY

  Scots pine · Pinaceae 24 counties