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 901–950 of 3,901.

• 
  Cirsium muticum Michx. Native CIMU

  swamp thistle · Asteraceae 53 counties
• 
  Cirsium pumilum Spreng. Native CIPU4

  pasture thistle · Asteraceae 55 counties
• 
  Cirsium undulatum (Nutt.) Spreng. Native CIUN

  wavyleaf thistle · Asteraceae 1 county
• 
  Cirsium undulatum (Nutt.) Spreng. var. undulatum Native CIUNU

  wavyleaf thistle · Asteraceae 1 county
• 
  Cirsium vulgare (Savi) Ten. Introduced CIVU

  bull thistle · Asteraceae 64 counties
• 
  Citrullus lanatus (Thunb.) Matsum. & Nakai Introduced CILA3

  watermelon · Cucurbitaceae 10 counties
• 
  Citrullus lanatus (Thunb.) Matsum. & Nakai var. lanatus Introduced CILAL

  watermelon · Cucurbitaceae 10 counties
• 
  Cladium mariscoides (Muhl.) Torr. Native CLMA

  smooth sawgrass · Cyperaceae 12 counties
• 
  Clarkia purpurea (W. Curtis) A. Nelson & J.F. Macbr. Native CLPU2

  winecup clarkia · Onagraceae 1 county
• 
  Clarkia purpurea (W. Curtis) A. Nelson & J.F. Macbr. ssp. quadrivulnera (Douglas ex Lindl.) F.H. Lewis & M.E. Lewis Native CLPUQ

  winecup clarkia · Onagraceae 1 county
• 
  Claytonia caroliniana Michx. Native CLCA

  Carolina springbeauty · Portulacaceae 37 counties
• 
  Claytonia caroliniana Michx. var. caroliniana Native CLCAC

  Carolina springbeauty · Portulacaceae 37 counties
• 
  Claytonia virginica L. Native CLVI3

  Virginia springbeauty · Portulacaceae 61 counties
• 
  Claytonia virginica L. var. virginica Native CLVIV

  Virginia springbeauty · Portulacaceae 61 counties
• 
  Claytonia virginica L. var. virginica f. lutea R.J. Davis Native CLVIL

  yellow Virginia springbeauty · Portulacaceae 2 counties
• 
  Claytonia virginica L. var. virginica f. virginica Native CLVIV2

  Virginia springbeauty · Portulacaceae 61 counties
• 
  Clematis ligusticifolia Nutt. Native CLLI2

  western white clematis · Ranunculaceae 1 county
• 
  Clematis ligusticifolia Nutt. var. ligusticifolia Native CLLIL2

  western white clematis · Ranunculaceae 1 county
• 
  Clematis occidentalis (Hornem.) DC. Native CLOC2

  western blue virginsbower · Ranunculaceae 27 counties
• 
  Clematis occidentalis (Hornem.) DC. var. occidentalis Native CLOCO

  western blue virginsbower · Ranunculaceae 27 counties
• 
  Clematis terniflora DC. Introduced CLTE4

  sweet autumn virginsbower · Ranunculaceae 18 counties
• 
  Clematis viorna L. Native CLVI4

  vasevine · Ranunculaceae 5 counties
• 
  Clematis virginiana L. Native CLVI5

  devil's darning needles · Ranunculaceae 66 counties
• 
  Cleome hassleriana Chod. Introduced CLHA

  pink queen · Capparaceae 16 counties
• 
  Cleome ornithopodioides L., nom. inq. Introduced CLOR2

  bird spiderflower · Capparaceae 1 county
• 
  Cleome viscosa L. Introduced CLVI9

  Asian spiderflower · Capparaceae 2 counties
• 
  Clerodendrum trichotomum Thunb. Introduced CLTR

  harlequin glorybower · Verbenaceae 1 county
• 
  Clerodendrum trichotomum Thunb. var. ferrugineum Nakai Introduced CLTRF

  ferruginous clerodendrum · Verbenaceae 1 county
• 
  Clethra acuminata Michx. Native CLAC3

  mountain sweetpepperbush · Clethraceae 1 county
• 
  Clethra alnifolia L. Native CLAL3

  coastal sweetpepperbush · Clethraceae 12 counties
• 
  Clinopodium arkansanum (Nutt.) House Native CLAR5

  limestone calamint · Lamiaceae 1 county
• 
  Clinopodium vulgare L. Native CLVU

  wild basil · Lamiaceae 67 counties
• 
  Clintonia borealis (Aiton) Raf. Native CLBO3

  bluebead · Liliaceae 40 counties
• 
  Clintonia umbellulata (Michx.) Morong Native CLUM2

  white clintonia · Liliaceae 28 counties
• 
  Clitoria mariana L. Native CLMA4

  Atlantic pigeonwings · Fabaceae 3 counties
• 
  Coincya monensis (L.) Greuter & Burdet Introduced COMO9

  star-mustard · Brassicaceae 2 counties
• 
  Coincya monensis (L.) Greuter & Burdet ssp. recurvata (All.) Leadley Introduced COMOR

  star-mustard · Brassicaceae 2 counties
• 
  Coix lacryma-jobi L. Introduced COLA

  Job's tears · Poaceae 3 counties
• 
  Collinsia parviflora Lindl. Native COPA3

  maiden blue eyed Mary · Scrophulariaceae 1 county
• 
  Collinsia verna Nutt. Native COVE2

  spring blue eyed Mary · Scrophulariaceae 8 counties
• 
  Collinsonia canadensis L. Native COCA4

  richweed · Lamiaceae 65 counties
• 
  Collomia linearis Nutt. Native COLI2

  tiny trumpet · Polemoniaceae 3 counties
• 
  Colutea arborescens L. Introduced COAR6

  bladder senna · Fabaceae 3 counties
• 
  Comandra umbellata (L.) Nutt. Native COUM

  bastard toadflax · Santalaceae 57 counties
• 
  Comandra umbellata (L.) Nutt. ssp. umbellata Native COUMU

  bastard toadflax · Santalaceae 57 counties
• 
  Comarum palustre L. Native COPA28

  purple marshlocks · Rosaceae 11 counties
• 
  Commelina communis L. Introduced COCO3

  Asiatic dayflower · Commelinaceae 54 counties
• 
  Commelina diffusa Burm. f. Native CODI5

  climbing dayflower · Commelinaceae 3 counties
• 
  Commelina diffusa Burm. f. var. diffusa Native CODID3

  climbing dayflower · Commelinaceae 3 counties
• 
  Commelina erecta L. Native COER

  whitemouth dayflower · Commelinaceae 1 county