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 2,101–2,150 of 2,748 (native).

• 
  Rhododendron maximum L. Native RHMA4

  great laurel · Ericaceae 57 counties
• 
  Rhododendron periclymenoides (Michx.) Shinners Native RHPE4

  pink azalea · Ericaceae 63 counties
• 
  Rhododendron prinophyllum (Small) Millais Native RHPR

  early azalea · Ericaceae 46 counties
• 
  Rhododendron viscosum (L.) Torr. Native RHVI2

  swamp azalea · Ericaceae 23 counties
• 
  Rhus aromatica Aiton Native RHAR4

  fragrant sumac · Anacardiaceae 12 counties
• 
  Rhus aromatica Aiton var. aromatica Native RHARA2

  fragrant sumac · Anacardiaceae 12 counties
• 
  Rhus copallinum L. Native RHCO

  winged sumac · Anacardiaceae 55 counties
• 
  Rhus copallinum L. var. copallinum Native RHCOC

  winged sumac · Anacardiaceae 27 counties
• 
  Rhus copallinum L. var. latifolia Engl. Native RHCOL2

  winged sumac · Anacardiaceae 53 counties
• 
  Rhus glabra L. Native RHGL

  smooth sumac · Anacardiaceae 61 counties
• 
  Rhus typhina L. Native RHTY

  staghorn sumac · Anacardiaceae 64 counties
• 
  Rhus ×borealis Greene [glabra × typhina] Native RHBO

  hybrid sumac · Anacardiaceae 1 county
• 
  Rhynchospora alba (L.) Vahl Native RHAL3

  white beaksedge · Cyperaceae 32 counties
• 
  Rhynchospora capillacea Torr. Native RHCA11

  needle beaksedge · Cyperaceae 6 counties
• 
  Rhynchospora capitellata (Michx.) Vahl Native RHCA12

  brownish beaksedge · Cyperaceae 38 counties
• 
  Rhynchospora fusca (L.) W.T. Aiton Native RHFU

  brown beaksedge · Cyperaceae 2 counties
• 
  Rhynchospora globularis (Chapm.) Small Native RHGL2

  globe beaksedge · Cyperaceae 1 county
• 
  Rhynchospora gracilenta A. Gray Native RHGR

  slender beaksedge · Cyperaceae 1 county
• 
  Rhynchospora recognita (Gale) Kral Native RHRE8

  globe beaksedge · Cyperaceae 6 counties
• 
  Ribes americanum Mill. Native RIAM2

  American black currant · Grossulariaceae 49 counties
• 
  Ribes aureum Pursh Native RIAU

  golden currant · Grossulariaceae 13 counties
• 
  Ribes aureum Pursh var. villosum DC. Native RIAUV

  golden currant · Grossulariaceae 13 counties
• 
  Ribes cynosbati L. Native RICY

  eastern prickly gooseberry · Grossulariaceae 45 counties
• 
  Ribes glandulosum Grauer Native RIGL

  skunk currant · Grossulariaceae 24 counties
• 
  Ribes hirtellum Michx. Native RIHI

  hairystem gooseberry · Grossulariaceae 28 counties
• 
  Ribes lacustre (Pers.) Poir. Native RILA

  prickly currant · Grossulariaceae 7 counties
• 
  Ribes missouriense Nutt. Native RIMI

  Missouri gooseberry · Grossulariaceae 4 counties
• 
  Ribes rotundifolium Michx. Native RIRO2

  Appalachian gooseberry · Grossulariaceae 48 counties
• 
  Ribes triste Pall. Native RITR

  red currant · Grossulariaceae 9 counties
• 
  Richardia brasiliensis Gomes Native RIBR2

  tropical Mexican clover · Rubiaceae 1 county
• 
  Robinia hispida L. Native ROHI

  bristly locust · Fabaceae 19 counties
• 
  Robinia pseudoacacia L. Native ROPS

  black locust · Fabaceae 61 counties
• 
  Robinia viscosa Vent. Native ROVI

  clammy locust · Fabaceae 15 counties
• 
  Robinia viscosa Vent. var. viscosa Native ROVIV

  clammy locust · Fabaceae 15 counties
• 
  Rorippa palustris (L.) Besser Native ROPA2

  bog yellowcress · Brassicaceae 62 counties
• 
  Rorippa palustris (L.) Besser ssp. fernaldiana (Butters & Abbe) Jonsell Native ROPAF2

  Fernald's yellowcress · Brassicaceae 60 counties
• 
  Rorippa palustris (L.) Besser ssp. hispida (Desv.) Jonsell Native ROPAH

  hispid yellowcress · Brassicaceae 23 counties
• 
  Rorippa palustris (L.) Besser ssp. palustris Native ROPAP

  bog yellowcress · Brassicaceae 14 counties
• 
  Rosa blanda Aiton Native ROBL

  smooth rose · Rosaceae 16 counties
• 
  Rosa blanda Aiton var. blanda Native ROBLB

  smooth rose · Rosaceae 16 counties
• 
  Rosa carolina L. Native ROCA4

  Carolina rose · Rosaceae 63 counties
• 
  Rosa carolina L. var. carolina Native ROCAC

  Carolina rose · Rosaceae 63 counties
• 
  Rosa palustris Marshall Native ROPA

  swamp rose · Rosaceae 52 counties
• 
  Rosa setigera Michx. Native ROSE2

  climbing rose · Rosaceae 10 counties
• 
  Rosa setigera Michx. var. tomentosa Torr. & A. Gray Native ROSET

  climbing rose · Rosaceae 9 counties
• 
  Rosa virginiana Mill. Native ROVI2

  Virginia rose · Rosaceae 17 counties
• 
  Rosa virginiana Mill. var. virginiana Native ROVIV2

  Virginia rose · Rosaceae 17 counties
• 
  Rotala ramosior (L.) Koehne Native RORA

  lowland rotala · Lythraceae 8 counties
• 
  Rubus allegheniensis Porter Native RUAL

  Allegheny blackberry · Rosaceae 63 counties
• 
  Rubus allegheniensis Porter var. allegheniensis Native RUALA

  Allegheny blackberry · Rosaceae 63 counties