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 51–100 of 3,901.

• 
  Aesculus glabra Willd. var. glabra Native AEGLG

  Ohio buckeye · Hippocastanaceae 17 counties
• 
  Aesculus hippocastanum L. Introduced AEHI

  horse chestnut · Hippocastanaceae 18 counties
• 
  Aesculus parviflora Walter Native AEPA2

  bottlebrush buckeye · Hippocastanaceae 5 counties
• 
  Aethusa cynapium L. Introduced AECY2

  fool's parsley · Apiaceae 7 counties
• 
  Agalinis auriculata (Michx.) S.F. Blake Native AGAU3

  earleaf false foxglove · Scrophulariaceae 5 counties
• 
  Agalinis fasciculata (Elliott) Raf. Native AGFA2

  beach false foxglove · Scrophulariaceae 1 county
• 
  Agalinis obtusifolia Raf. Native AGOB

  tenlobe false foxglove · Scrophulariaceae 1 county
• ⚘
  Agalinis paupercula (A. Gray) Britton Native AGPA12

  smallflower false foxglove · Scrophulariaceae 7 counties
• 
  Agalinis purpurea (L.) Pennell Native AGPU5

  purple false foxglove · Scrophulariaceae 17 counties
• 
  Agalinis tenuifolia (Vahl) Raf. Native AGTE3

  slenderleaf false foxglove · Scrophulariaceae 43 counties
• 
  Agastache foeniculum (Pursh) Kuntze Native AGFO

  blue giant hyssop · Lamiaceae 4 counties
• 
  Agastache nepetoides (L.) Kuntze Native AGNE2

  yellow giant hyssop · Lamiaceae 30 counties
• 
  Agastache scrophulariifolia (Willd.) Kuntze Native AGSC

  purple giant hyssop · Lamiaceae 28 counties
• 
  Ageratina altissima (L.) R.M. King & H. Rob. Native AGAL5

  white snakeroot · Asteraceae 67 counties
• 
  Ageratina altissima (L.) R.M. King & H. Rob. var. altissima Native AGALA

  white snakeroot · Asteraceae 67 counties
• 
  Ageratina aromatica (L.) Spach Native AGAR4

  lesser snakeroot · Asteraceae 15 counties
• 
  Ageratina aromatica (L.) Spach var. aromatica Native AGARA

  lesser snakeroot · Asteraceae 15 counties
• 
  Agrimonia gryposepala Wallr. Native AGGR2

  tall hairy agrimony · Rosaceae 67 counties
• 
  Agrimonia microcarpa Wallr. Native AGMI2

  smallfruit agrimony · Rosaceae 28 counties
• 
  Agrimonia parviflora Aiton Native AGPA6

  harvestlice · Rosaceae 39 counties
• 
  Agrimonia pubescens Wallr. Native AGPU

  soft agrimony · Rosaceae 46 counties
• 
  Agrimonia rostellata Wallr. Native AGRO3

  beaked agrimony · Rosaceae 28 counties
• 
  Agrimonia striata Michx. Native AGST

  roadside agrimony · Rosaceae 44 counties
• 
  Agrostemma githago L. Introduced AGGI

  common corncockle · Caryophyllaceae 42 counties
• 
  Agrostis canina L. Native AGCA4

  velvet bentgrass · Poaceae 3 counties
• 
  Agrostis capillaris L. Introduced AGCA5

  colonial bentgrass · Poaceae 27 counties
• 
  Agrostis elliottiana Schult. Native AGEL4

  Elliott's bentgrass · Poaceae 3 counties
• 
  Agrostis gigantea Roth Introduced AGGI2

  redtop · Poaceae 67 counties
• 
  Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. Native AGHY

  winter bentgrass · Poaceae 28 counties
• 
  Agrostis perennans (Walter) Tuck. Native AGPE

  upland bentgrass · Poaceae 67 counties
• 
  Agrostis scabra Willd. Native AGSC5

  rough bentgrass · Poaceae 45 counties
• 
  Agrostis stolonifera L. Introduced AGST2

  creeping bentgrass · Poaceae 33 counties
• 
  Ailanthus altissima (Mill.) Swingle Introduced AIAL

  tree of heaven · Simaroubaceae 37 counties
• 
  Aira caryophyllea L. Introduced AICA

  silver hairgrass · Poaceae 1 county
• 
  Aira caryophyllea L. var. caryophyllea Introduced AICAC2

  silver hairgrass · Poaceae 1 county
• 
  Aira praecox L. Introduced AIPR

  yellow hairgrass · Poaceae 3 counties
• 
  Ajuga genevensis L. Introduced AJGE

  blue bugle · Lamiaceae 3 counties
• 
  Ajuga reptans L. Introduced AJRE

  common bugle · Lamiaceae 19 counties
• 
  Akebia quinata (Houtt.) Decne. Introduced AKQU

  chocolate vine · Lardizabalaceae 7 counties
• 
  Albizia julibrissin Durazz. Introduced ALJU

  silktree · Fabaceae 4 counties
• 
  Alcea rosea L. Introduced ALRO3

  hollyhock · Malvaceae 23 counties
• 
  Aletris farinosa L. Native ALFA2

  white colicroot · Liliaceae 11 counties
• 
  Alisma subcordatum Raf. Native ALSU

  American water plantain · Alismataceae 61 counties
• 
  Alisma triviale Pursh Native ALTR7

  northern water plantain · Alismataceae 12 counties
• 
  Alliaria petiolata (M. Bieb.) Cavara & Grande Introduced ALPE4

  garlic mustard · Brassicaceae 38 counties
• 
  Allium canadense L. Native ALCA3

  meadow garlic · Liliaceae 52 counties
• 
  Allium canadense L. var. canadense Native ALCAC

  meadow garlic · Liliaceae 52 counties
• 
  Allium cepa L. Introduced ALCE

  garden onion · Liliaceae 7 counties
• 
  Allium cernuum Roth Native ALCE2

  nodding onion · Liliaceae 37 counties
• 
  Allium cernuum Roth var. cernuum Native ALCEC2

  nodding onion · Liliaceae 37 counties