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 1,701–1,750 of 2,748 (native).

• 
  Ostrya virginiana (Mill.) K. Koch Native OSVI

  hophornbeam · Betulaceae 61 counties
• 
  Oxalis corniculata L. Native OXCO

  creeping woodsorrel · Oxalidaceae 18 counties
• 
  Oxalis dillenii Jacq. Native OXDI2

  slender yellow woodsorrel · Oxalidaceae 56 counties
• 
  Oxalis grandis Small Native OXGR

  great yellow woodsorrel · Oxalidaceae 21 counties
• 
  Oxalis montana Raf. Native OXMO

  mountain woodsorrel · Oxalidaceae 41 counties
• 
  Oxalis stricta L. Native OXST

  common yellow oxalis · Oxalidaceae 67 counties
• 
  Oxalis violacea L. Native OXVI

  violet woodsorrel · Oxalidaceae 46 counties
• 
  Oxydendrum arboreum (L.) DC. Native OXAR

  sourwood · Ericaceae 6 counties
• 
  Oxypolis rigidior (L.) Raf. Native OXRI

  stiff cowbane · Apiaceae 17 counties
• 
  Pachysandra procumbens Michx. Native PAPR7

  Allegheny-spurge · Buxaceae 3 counties
• 
  Packera anonyma (Alph. Wood) W.A. Weber & Á. Löve Native PAAN6

  Small's ragwort · Asteraceae 10 counties
• 
  Packera antennariifolia (Britton) W.A. Weber & Á. Löve Native PAAN7

  shale barren ragwort · Asteraceae 3 counties
• 
  Packera aurea (L.) Á. Löve & D. Löve Native PAAU3

  golden ragwort · Asteraceae 67 counties
• 
  Packera obovata (Muhl. ex Willd.) W.A. Weber & Á. Löve Native PAOB6

  roundleaf ragwort · Asteraceae 47 counties
• 
  Packera paupercula (Michx.) Á. Löve & D. Löve Native PAPA20

  balsam groundsel · Asteraceae 24 counties
• 
  Packera plattensis (Nutt.) W.A. Weber & Á. Löve Native PAPL12

  prairie groundsel · Asteraceae 1 county
• 
  Panax quinquefolius L. Native PAQU

  American ginseng · Araliaceae 53 counties
• 
  Panax trifolius L. Native PATR2

  dwarf ginseng · Araliaceae 59 counties
• 
  Panicum amarum Elliott Native PAAM2

  bitter panicgrass · Poaceae 2 counties
• 
  Panicum amarum Elliott var. amarulum (Hitchc. & Chase) P.G. Palmer Native PAAMA2

  coastal panicgrass · Poaceae 1 county
• 
  Panicum amarum Elliott var. amarum Native PAAMA3

  bitter panicgrass · Poaceae 2 counties
• 
  Panicum anceps Michx. Native PAAN

  beaked panicgrass · Poaceae 15 counties
• 
  Panicum capillare L. Native PACA6

  witchgrass · Poaceae 63 counties
• 
  Panicum dichotomiflorum Michx. Native PADI

  fall panicgrass · Poaceae 60 counties
• 
  Panicum dichotomiflorum Michx. var. dichotomiflorum Native PADID

  fall panicgrass · Poaceae 60 counties
• 
  Panicum flexile (Gattinger) Scribn. Native PAFL2

  wiry panicgrass · Poaceae 14 counties
• 
  Panicum gattingeri Nash Native PAGA

  Gattinger's panicgrass · Poaceae 64 counties
• 
  Panicum philadelphicum Bernh. ex Trin. Native PAPH

  Philadelphia panicgrass · Poaceae 37 counties
• 
  Panicum rigidulum Bosc ex Nees Native PARI4

  redtop panicgrass · Poaceae 48 counties
• 
  Panicum rigidulum Bosc ex Nees var. elongatum (Pursh) Lelong Native PARIE2

  redtop panicgrass · Poaceae 24 counties
• 
  Panicum rigidulum Bosc ex Nees var. pubescens (Vasey) Lelong Native PARIP

  redtop panicgrass · Poaceae 8 counties
• 
  Panicum rigidulum Bosc ex Nees var. rigidulum Native PARIR

  redtop panicgrass · Poaceae 1 county
• 
  Panicum verrucosum Muhl. Native PAVE2

  warty panicgrass · Poaceae 10 counties
• 
  Panicum virgatum L. Native PAVI2

  switchgrass · Poaceae 48 counties
• 
  Panicum virgatum L. var. virgatum Native PAVIV

  switchgrass · Poaceae 1 county
• 
  Parietaria pensylvanica Muhl. ex Willd. Native PAPE5

  Pennsylvania pellitory · Urticaceae 37 counties
• 
  Parnassia glauca Raf. Native PAGL3

  fen grass of Parnassus · Saxifragaceae 9 counties
• 
  Paronychia canadensis (L.) Alph. Wood Native PACA11

  smooth forked nailwort · Caryophyllaceae 50 counties
• 
  Paronychia fastigiata (Raf.) Fernald Native PAFA3

  hairy forked nailwort · Caryophyllaceae 41 counties
• 
  Paronychia fastigiata (Raf.) Fernald var. fastigiata Native PAFAF

  hairy forked nailwort · Caryophyllaceae 39 counties
• 
  Paronychia fastigiata (Raf.) Fernald var. nuttallii (Small) Fernald Native PAFAN

  hairy forked nailwort · Caryophyllaceae 9 counties
• 
  Paronychia montana (Small) Pax & K. Hoffm. Native PAMO7

  mountain nailwort · Caryophyllaceae 11 counties
• 
  Parthenium integrifolium L. Native PAIN3

  wild quinine · Asteraceae 6 counties
• 
  Parthenium integrifolium L. var. integrifolium Native PAINI

  wild quinine · Asteraceae 5 counties
• 
  Parthenocissus quinquefolia (L.) Planch. Native PAQU2

  Virginia creeper · Vitaceae 63 counties
• 
  Paspalum distichum L. Native PADI6

  knotgrass · Poaceae 1 county
• 
  Paspalum floridanum Michx. Native PAFL4

  Florida paspalum · Poaceae 1 county
• 
  Paspalum laeve Michx. Native PALA10

  field paspalum · Poaceae 18 counties
• 
  Paspalum pubiflorum Rupr. ex Fourn. Native PAPU5

  hairyseed paspalum · Poaceae 1 county
• 
  Paspalum setaceum Michx. Native PASE5

  thin paspalum · Poaceae 22 counties