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 1,851–1,900 of 2,748 (native).

• 
  Platanthera hookeri (Torr. ex A. Gray) Lindl. Native PLHO3

  Hooker's orchid · Orchidaceae 19 counties
• 
  Platanthera huronensis (Nutt.) Lindl. Native PLHU2

  Huron green orchid · Orchidaceae 5 counties
• 
  Platanthera lacera (Michx.) G. Don Native PLLA2

  green fringed orchid · Orchidaceae 49 counties
• 
  Platanthera leucophaea (Nutt.) Lindl. Native PLLE2

  prairie white fringed orchid · Orchidaceae 1 county
• 
  Platanthera macrophylla (Goldie) P.M. Brown Native PLMA9

  greater roundleaved orchid · Orchidaceae 6 counties
• 
  Platanthera orbiculata (Pursh) Lindl. Native PLOR4

  lesser roundleaved orchid · Orchidaceae 43 counties
• 
  Platanthera peramoena (A. Gray) A. Gray Native PLPE

  purple fringeless orchid · Orchidaceae 9 counties
• 
  Platanthera psycodes (L.) Lindl. Native PLPS2

  lesser purple fringed orchid · Orchidaceae 45 counties
• 
  Platanthera ×shriveri P.M. Br., (pro. sp.) [grandiflora × lacera] Native PLSH4

  Shriver's purple fringed orchid · Orchidaceae 1 county
• 
  Platanus occidentalis L. Native PLOC

  American sycamore · Platanaceae 63 counties
• 
  Pluchea odorata (L.) Cass. Native PLOD

  sweetscent · Asteraceae 4 counties
• 
  Pluchea odorata (L.) Cass. var. succulenta (Fernald) Cronquist Native PLODS

  sweetscent · Asteraceae 4 counties
• 
  Poa alsodes A. Gray Native POAL3

  grove bluegrass · Poaceae 51 counties
• 
  Poa arida Vasey Native POAR3

  plains bluegrass · Poaceae 1 county
• 
  Poa autumnalis Muhl. ex Elliott Native POAU

  autumn bluegrass · Poaceae 5 counties
• 
  Poa cuspidata Nutt. Native POCU4

  early bluegrass · Poaceae 33 counties
• 
  Poa glauca Vahl Native POGL

  glaucous bluegrass · Poaceae 1 county
• 
  Poa glauca Vahl ssp. glauca Native POGLG

  glaucous bluegrass · Poaceae 1 county
• 
  Poa paludigena Fernald & Wiegand Native POPA

  bog bluegrass · Poaceae 12 counties
• 
  Poa palustris L. Native POPA2

  fowl bluegrass · Poaceae 46 counties
• 
  Poa saltuensis Fernald & Wiegand Native POSA

  oldpasture bluegrass · Poaceae 29 counties
• 
  Poa sylvestris A. Gray Native POSY

  woodland bluegrass · Poaceae 23 counties
• 
  Podophyllum peltatum L. Native POPE

  mayapple · Berberidaceae 67 counties
• 
  Podostemum ceratophyllum Michx. Native POCE3

  hornleaf riverweed · Podostemaceae 30 counties
• 
  Pogonia ophioglossoides (L.) Ker Gawl. Native POOP

  snakemouth orchid · Orchidaceae 27 counties
• 
  Polanisia dodecandra (L.) DC. Native PODO3

  redwhisker clammyweed · Capparaceae 31 counties
• 
  Polanisia dodecandra (L.) DC. ssp. dodecandra Native PODOD

  redwhisker clammyweed · Capparaceae 28 counties
• 
  Polanisia dodecandra (L.) DC. ssp. trachysperma (Torr. & A. Gray) Iltis Native PODOT

  sandyseed clammyweed · Capparaceae 5 counties
• 
  Polemonium micranthum Benth. Native POMI

  annual polemonium · Polemoniaceae 1 county
• 
  Polemonium reptans L. Native PORE2

  Greek valerian · Polemoniaceae 54 counties
• 
  Polemonium reptans L. var. reptans Native PORER

  Greek valerian · Polemoniaceae 54 counties
• 
  Polemonium vanbruntiae Britton Native POVA5

  Vanbrunt's polemonium · Polemoniaceae 5 counties
• 
  Polygala ambigua Nutt. Native POAM9

  whorled milkwort · Polygalaceae 38 counties
• 
  Polygala cruciata L. Native POCR

  drumheads · Polygalaceae 9 counties
• 
  Polygala cruciata L. var. aquilonia Fernald & B.G. Schub. Native POCRA

  drumheads · Polygalaceae 9 counties
• 
  Polygala curtissii A. Gray Native POCU5

  Curtiss' milkwort · Polygalaceae 1 county
• 
  Polygala incarnata L. Native POIN4

  procession flower · Polygalaceae 1 county
• 
  Polygala lutea L. Native POLU

  orange milkwort · Polygalaceae 1 county
• 
  Polygala nuttallii Torr. & A. Gray Native PONU2

  Nuttall's milkwort · Polygalaceae 12 counties
• 
  Polygala paucifolia Willd. Native POPA5

  gaywings · Polygalaceae 57 counties
• 
  Polygala polygama Walter Native POPO

  racemed milkwort · Polygalaceae 9 counties
• 
  Polygala sanguinea L. Native POSA3

  purple milkwort · Polygalaceae 60 counties
• 
  Polygala senega L. Native POSE3

  Seneca snakeroot · Polygalaceae 25 counties
• 
  Polygala verticillata L. Native POVE

  whorled milkwort · Polygalaceae 60 counties
• 
  Polygala verticillata L. var. isocycla Fernald Native POVEI

  whorled milkwort · Polygalaceae 16 counties
• 
  Polygala verticillata L. var. verticillata Native POVEV

  whorled milkwort · Polygalaceae 60 counties
• 
  Polygonatum biflorum (Walter) Elliott Native POBI2

  smooth Solomon's seal · Liliaceae 64 counties
• 
  Polygonatum biflorum (Walter) Elliott var. commutatum (Schult. & Schult. f.) Morong Native POBIC

  smooth Solomon's seal · Liliaceae 64 counties
• 
  Polygonatum pubescens (Willd.) Pursh Native POPU4

  hairy Solomon's seal · Liliaceae 63 counties
• 
  Polygonella articulata (L.) Meisn. Native POAR4

  coastal jointweed · Polygonaceae 2 counties