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 801–850 of 3,901.

• 
  Centaurium erythraea Rafn Introduced CEER5

  European centaury · Gentianaceae 4 counties
• 
  Centaurium pulchellum (Sw.) Druce Introduced CEPU3

  branched centaury · Gentianaceae 7 counties
• 
  Cephalanthus occidentalis L. Native CEOC2

  common buttonbush · Rubiaceae 55 counties
• 
  Cerastium arvense L. Both CEAR4

  field chickweed · Caryophyllaceae 33 counties
• 
  Cerastium arvense L. ssp. strictum (L.) Ugborogho Native CEARS2

  field chickweed · Caryophyllaceae 2 counties
• 
  Cerastium arvense L. ssp. velutinum (Raf.) Ugborogho Native CEARV2

  field chickweed · Caryophyllaceae 32 counties
• 
  Cerastium arvense L. ssp. velutinum (Raf.) Ugborogho var. villosum (Muhl. ex Darl.) Hollick & Britton Native CEARV4

  field chickweed · Caryophyllaceae 2 counties
• 
  Cerastium fontanum Baumg. Introduced CEFO2

  common mouse-ear chickweed · Caryophyllaceae 66 counties
• 
  Cerastium fontanum Baumg. ssp. vulgare (Hartm.) Greuter & Burdet Introduced CEFOV2

  big chickweed · Caryophyllaceae 66 counties
• 
  Cerastium glomeratum Thuill. Introduced CEGL2

  sticky chickweed · Caryophyllaceae 16 counties
• 
  Cerastium nutans Raf. Native CENU2

  nodding chickweed · Caryophyllaceae 48 counties
• 
  Cerastium nutans Raf. var. nutans Native CENUN

  nodding chickweed · Caryophyllaceae 48 counties
• 
  Cerastium semidecandrum L. Introduced CESE4

  fivestamen chickweed · Caryophyllaceae 3 counties
• 
  Cerastium tomentosum L. Introduced CETO2

  snow in summer · Caryophyllaceae 6 counties
• 
  Ceratophyllum demersum L. Native CEDE4

  coon's tail · Ceratophyllaceae 30 counties
• 
  Ceratophyllum echinatum A. Gray Native CEEC2

  spineless hornwort · Ceratophyllaceae 21 counties
• 
  Cercidiphyllum japonicum Siebold & Zucc. Introduced CEJA2

  katsura tree · Cercidiphyllaceae 2 counties
• 
  Cercis canadensis L. Native CECA4

  eastern redbud · Fabaceae 32 counties
• 
  Cercis canadensis L. var. canadensis Native CECAC

  eastern redbud · Fabaceae 32 counties
• 
  Chaenomeles speciosa (Sweet) Nakai Introduced CHSP12

  flowering quince · Rosaceae 10 counties
• 
  Chaenorhinum minus (L.) Lange Introduced CHMI

  dwarf snapdragon · Scrophulariaceae 42 counties
• 
  Chaerophyllum procumbens (L.) Crantz Native CHPR

  spreading chervil · Apiaceae 30 counties
• 
  Chaerophyllum procumbens (L.) Crantz var. procumbens Native CHPRP

  spreading chervil · Apiaceae 1 county
• 
  Chaiturus marrubiastrum (L.) Rchb. Introduced CHMA18

  lion's tail · Lamiaceae 11 counties
• 
  Chamaecrista fasciculata (Michx.) Greene Native CHFA2

  partridge pea · Fabaceae 22 counties
• 
  Chamaecrista fasciculata (Michx.) Greene var. fasciculata Native CHFAF

  partridge pea · Fabaceae 22 counties
• 
  Chamaecrista nictitans (L.) Moench Native CHNI2

  sensitive partridge pea · Fabaceae 45 counties
• 
  Chamaecrista nictitans (L.) Moench ssp. nictitans Native CHNIN

  sensitive partridge pea · Fabaceae 45 counties
• 
  Chamaecrista nictitans (L.) Moench ssp. nictitans var. nictitans Native CHNIN2

  sensitive partridge pea · Fabaceae 45 counties
• 
  Chamaecyparis thyoides (L.) Britton, Sterns & Poggenb. Native CHTH2

  Atlantic white cedar · Cupressaceae 1 county
• 
  Chamaedaphne calyculata (L.) Moench Native CHCA2

  leatherleaf · Ericaceae 23 counties
• 
  Chamaelirium luteum (L.) A. Gray Native CHLU

  fairywand · Liliaceae 45 counties
• 
  Chamaesyce maculata (L.) Small Native CHMA15

  spotted sandmat · Euphorbiaceae 63 counties
• 
  Chamaesyce nutans (Lag.) Small Native CHNU9

  eyebane · Euphorbiaceae 62 counties
• 
  Chamaesyce polygonifolia (L.) Small Native CHPO6

  seaside sandmat · Euphorbiaceae 3 counties
• 
  Chamaesyce prostrata (Aiton) Small Native CHPR6

  prostrate sandmat · Euphorbiaceae 1 county
• 
  Chamaesyce serpens (Kunth) Small Native CHSE4

  matted sandmat · Euphorbiaceae 2 counties
• 
  Chamaesyce serpyllifolia (Pers.) Small Native CHSE6

  thymeleaf sandmat · Euphorbiaceae 1 county
• 
  Chamaesyce serpyllifolia (Pers.) Small ssp. serpyllifolia Native CHSES

  thymeleaf sandmat · Euphorbiaceae 1 county
• 
  Chamaesyce vermiculata (Raf.) House Native CHVE5

  wormseed sandmat · Euphorbiaceae 51 counties
• 
  Chamerion angustifolium (L.) Holub Native CHAN9

  fireweed · Onagraceae 56 counties
• 
  Chamerion angustifolium (L.) Holub ssp. circumvagum (Mosquin) Hoch Native CHANC

  fireweed · Onagraceae 56 counties
• 
  Chasmanthium latifolium (Michx.) Yates Native CHLA5

  Indian woodoats · Poaceae 5 counties
• 
  Chasmanthium laxum (L.) Yates Native CHLA6

  slender woodoats · Poaceae 3 counties
• 
  Cheilanthes lanosa (Michx.) D.C. Eaton Native CHLA2

  hairy lipfern · Pteridaceae 23 counties
• 
  Chelidonium majus L. Introduced CHMA2

  celandine · Papaveraceae 62 counties
• 
  Chelidonium majus L. var. majus Introduced CHMAM

  celandine · Papaveraceae 62 counties
• 
  Chelone glabra L. Native CHGL2

  white turtlehead · Scrophulariaceae 64 counties
• 
  Chenopodium album L. Both CHAL7

  lambsquarters · Chenopodiaceae 67 counties
• 
  Chenopodium album L. var. album Introduced CHALA

  lambsquarters · Chenopodiaceae 67 counties