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 2,651–2,700 of 3,901.

• 
  Poa compressa L. Introduced POCO

  Canada bluegrass · Poaceae 66 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 nemoralis L. Both PONE

  wood bluegrass · Poaceae 9 counties
• 
  Poa nemoralis L. ssp. nemoralis Introduced PONEN2

  wood bluegrass · Poaceae 9 counties
• 
  Poa paludigena Fernald & Wiegand Native POPA

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

  fowl bluegrass · Poaceae 46 counties
• 
  Poa pratensis L. Both POPR

  Kentucky bluegrass · Poaceae 63 counties
• 
  Poa pratensis L. ssp. pratensis Introduced POPRP2

  Kentucky bluegrass · Poaceae 63 counties
• 
  Poa saltuensis Fernald & Wiegand Native POSA

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

  woodland bluegrass · Poaceae 23 counties
• 
  Poa trivialis L. Introduced POTR2

  rough bluegrass · Poaceae 57 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 caeruleum L. Introduced POCA2

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

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

  fourleaf manyseed · Caryophyllaceae 2 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
• 
  Polygonum amphibium L. Native POAM8

  water knotweed · Polygonaceae 47 counties
• 
  Polygonum amphibium L. var. emersum Michx. Native POAME

  longroot smartweed · Polygonaceae 47 counties
• 
  Polygonum amphibium L. var. stipulaceum Coleman Native POAMS

  water smartweed · Polygonaceae 8 counties
• 
  Polygonum arenastrum Jord. ex Boreau Introduced POAR11

  oval-leaf knotweed · Polygonaceae 9 counties
• 
  Polygonum arifolium L. Native POAR6

  halberdleaf tearthumb · Polygonaceae 49 counties
• 
  Polygonum aviculare L. Introduced POAV

  prostrate knotweed · Polygonaceae 63 counties