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 3,901.

• 
  Iris versicolor L. Native IRVE2

  harlequin blueflag · Iridaceae 51 counties
• 
  Isoetes engelmannii A. Braun Native ISEN

  Appalachian quillwort · Isoetaceae 42 counties
• 
  Isoetes riparia Engelm. ex A. Braun Native ISRI

  shore quillwort · Isoetaceae 16 counties
• 
  Isoetes riparia Engelm. ex A. Braun var. riparia Native ISRIR

  shore quillwort · Isoetaceae 15 counties
• 
  Isoetes tenella Léman Native ISTE5

  spiny-spore quillwort · Isoetaceae 13 counties
• 
  Isoetes tuckermanii A. Braun Native ISTU

  Tuckerman's quillwort · Isoetaceae 1 county
• ⚘
  Isoetes ×brittonii Brunton & W.C. Taylor [engelmannii × riparia] Native ISBR5

  quillwort · Isoetaceae 5 counties
• 
  Isotria medeoloides (Pursh) Raf. Native ISME2

  small whorled pogonia · Orchidaceae 7 counties
• 
  Isotria verticillata Raf. Native ISVE

  large whorled pogonia · Orchidaceae 43 counties
• 
  Itea virginica L. Native ITVI

  Virginia sweetspire · Grossulariaceae 2 counties
• 
  Iva annua L. Native IVAN2

  annual marsh elder · Asteraceae 1 county
• 
  Iva annua L. var. annua Native IVANA

  annual marsh elder · Asteraceae 1 county
• 
  Iva frutescens L. Native IVFR

  Jesuit's bark · Asteraceae 1 county
• 
  Iva frutescens L. ssp. oraria (Bartlett) R.C. Jacks. Native IVFRO2

  Jesuit's bark · Asteraceae 1 county
• 
  Ixeris stolonifera A. Gray Introduced IXST

  creeping lettuce · Asteraceae 6 counties
• 
  Jacquemontia tamnifolia (L.) Griseb. Native JATA

  hairy clustervine · Convolvulaceae 1 county
• 
  Japewiella dollypartoniana J.L. Allen & Lendemer Native JADO

  Dolly Parton's lichen · Lecanoraceae 5 counties
• 
  Jasione montana L. Introduced JAMO

  sheepbit · Campanulaceae 3 counties
• 
  Jeffersonia diphylla (L.) Pers. Native JEDI

  twinleaf · Berberidaceae 15 counties
• 
  Juglans cinerea L. Native JUCI

  butternut · Juglandaceae 65 counties
• 
  Juglans nigra L. Native JUNI

  black walnut · Juglandaceae 50 counties
• 
  Juncus acuminatus Michx. Native JUAC

  tapertip rush · Juncaceae 61 counties
• 
  Juncus alpinoarticulatus Chaix Native JUAL4

  northern green rush · Juncaceae 1 county
• 
  Juncus alpinoarticulatus Chaix ssp. nodulosus (Wahlenb.) Hämet-Ahti Native JUALN

  northern green rush · Juncaceae 1 county
• 
  Juncus arcticus Willd. Both JUAR2

  arctic rush · Juncaceae 7 counties
• 
  Juncus arcticus Willd. ssp. littoralis (Engelm.) Hultén Native JUARL

  mountain rush · Juncaceae 7 counties
• 
  Juncus articulatus L. Native JUAR4

  jointleaf rush · Juncaceae 12 counties
• 
  Juncus biflorus Elliott Native JUBI

  bog rush · Juncaceae 10 counties
• 
  Juncus brachycarpus Engelm. Native JUBR

  whiteroot rush · Juncaceae 1 county
• 
  Juncus brachycephalus (Engelm.) Buchenau Native JUBR2

  smallhead rush · Juncaceae 10 counties
• 
  Juncus brevicaudatus (Engelm.) Fernald Native JUBR4

  narrowpanicle rush · Juncaceae 33 counties
• 
  Juncus bufonius L. Native JUBU

  toad rush · Juncaceae 42 counties
• 
  Juncus canadensis J. Gay ex Laharpe Native JUCA3

  Canadian rush · Juncaceae 40 counties
• 
  Juncus debilis A. Gray Native JUDE

  weak rush · Juncaceae 14 counties
• 
  Juncus dichotomus Elliott Native JUDI

  forked rush · Juncaceae 24 counties
• 
  Juncus dudleyi Wiegand Native JUDU2

  Dudley's rush · Juncaceae 30 counties
• 
  Juncus effusus L. Native JUEF

  common rush · Juncaceae 65 counties
• 
  Juncus filiformis L. Native JUFI

  thread rush · Juncaceae 9 counties
• 
  Juncus gerardii Loisel. Native JUGE

  saltmeadow rush · Juncaceae 8 counties
• 
  Juncus gerardii Loisel. var. gerardii Native JUGEG

  saltmeadow rush · Juncaceae 8 counties
• 
  Juncus greenei Oakes & Tuck. Native JUGR

  Greene's rush · Juncaceae 2 counties
• 
  Juncus gymnocarpus Coville Native JUGY

  Pennsylvania rush · Juncaceae 4 counties
• 
  Juncus inflexus L. Introduced JUIN

  European meadow rush · Juncaceae 1 county
• 
  Juncus marginatus Rostk. Native JUMA4

  grassleaf rush · Juncaceae 56 counties
• 
  Juncus militaris Bigelow Native JUMI2

  bayonet rush · Juncaceae 4 counties
• 
  Juncus nodosus L. Native JUNO2

  knotted rush · Juncaceae 21 counties
• 
  Juncus nodosus L. var. nodosus Native JUNON

  knotted rush · Juncaceae 21 counties
• 
  Juncus pelocarpus E. Mey. Native JUPE

  brownfruit rush · Juncaceae 14 counties
• 
  Juncus scirpoides Lam. Native JUSC

  needlepod rush · Juncaceae 6 counties
• 
  Juncus secundus P. Beauv. ex Poir. Native JUSE

  lopsided rush · Juncaceae 24 counties