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 951–1,000 of 3,901.

• 
  Commelina virginica L. Native COVI3

  Virginia dayflower · Commelinaceae 2 counties
• 
  Comptonia peregrina (L.) J.M. Coult. Native COPE80

  sweet fern · Myricaceae 56 counties
• 
  Conioselinum chinense (L.) Britton, Sterns & Poggenb. Native COCH2

  eastern hemlockparsley · Apiaceae 8 counties
• 
  Conium maculatum L. Introduced COMA2

  poison hemlock · Apiaceae 36 counties
• 
  Conoclinium coelestinum (L.) DC. Native COCO13

  blue mistflower · Asteraceae 20 counties
• 
  Conopholis americana (L.) Wallr. Native COAM

  American cancer-root · Orobanchaceae 48 counties
• 
  Conringia orientalis (L.) Dumort. Introduced COOR

  hare's ear mustard · Brassicaceae 12 counties
• 
  Consolida ajacis (L.) Schur Introduced COAJ

  doubtful knight's-spur · Ranunculaceae 30 counties
• 
  Consolida regalis Gray Introduced CORE2

  royal knight's-spur · Ranunculaceae 2 counties
• 
  Convallaria majalis L. Introduced COMA7

  European lily of the valley · Liliaceae 31 counties
• 
  Convolvulus arvensis L. Introduced COAR4

  field bindweed · Convolvulaceae 37 counties
• 
  Conyza canadensis (L.) Cronquist Native COCA5

  Canadian horseweed · Asteraceae 66 counties
• 
  Conyza canadensis (L.) Cronquist var. canadensis Native COCAC3

  Canadian horseweed · Asteraceae 66 counties
• 
  Conyza canadensis (L.) Cronquist var. pusilla (Nutt.) Cronquist Native COCAP3

  Canadian horseweed · Asteraceae 3 counties
• 
  Conyza ramosissima Cronquist Native CORA4

  dwarf horseweed · Asteraceae 1 county
• 
  Coptis trifolia (L.) Salisb. Native COTR2

  threeleaf goldthread · Ranunculaceae 47 counties
• 
  Corallorhiza maculata (Raf.) Raf. Native COMA25

  summer coralroot · Orchidaceae 58 counties
• 
  Corallorhiza maculata (Raf.) Raf. var. maculata Native COMAM7

  summer coralroot · Orchidaceae 1 county
• 
  Corallorhiza odontorhiza (Willd.) Poir. Native COOD7

  autumn coralroot · Orchidaceae 32 counties
• 
  Corallorhiza trifida Chatelain Native COTR18

  yellow coralroot · Orchidaceae 22 counties
• 
  Corallorhiza wisteriana Conrad Native COWI5

  spring coralroot · Orchidaceae 12 counties
• 
  Coreopsis lanceolata L. Native COLA5

  lanceleaf tickseed · Asteraceae 32 counties
• 
  Coreopsis major Walter Native COMA6

  greater tickseed · Asteraceae 1 county
• 
  Coreopsis rosea Nutt. Native CORO

  pink tickseed · Asteraceae 1 county
• 
  Coreopsis tinctoria Nutt. Native COTI3

  golden tickseed · Asteraceae 16 counties
• 
  Coreopsis tinctoria Nutt. var. tinctoria Native COTIT

  golden tickseed · Asteraceae 16 counties
• 
  Coreopsis tripteris L. Native COTR4

  tall tickseed · Asteraceae 24 counties
• 
  Coriandrum sativum L. Introduced COSA

  coriander · Apiaceae 3 counties
• 
  Cornus alternifolia L. f. Native COAL2

  alternateleaf dogwood · Cornaceae 66 counties
• 
  Cornus amomum Mill. Native COAM2

  silky dogwood · Cornaceae 63 counties
• 
  Cornus canadensis L. Native COCA13

  bunchberry dogwood · Cornaceae 34 counties
• 
  Cornus drummondii C.A. Mey. Native CODR

  roughleaf dogwood · Cornaceae 1 county
• 
  Cornus florida L. Native COFL2

  flowering dogwood · Cornaceae 64 counties
• 
  Cornus obliqua Raf. Native COOB9

  silky dogwood · Cornaceae 45 counties
• 
  Cornus racemosa Lam. Native CORA6

  gray dogwood · Cornaceae 65 counties
• 
  Cornus rugosa Lam. Native CORU

  roundleaf dogwood · Cornaceae 44 counties
• 
  Cornus sanguinea L. Introduced COSA81

  bloodtwig dogwood · Cornaceae 2 counties
• 
  Cornus sericea L. Native COSE16

  redosier dogwood · Cornaceae 20 counties
• 
  Cornus sericea L. ssp. sericea Native COSES

  redosier dogwood · Cornaceae 20 counties
• 
  Coronopus didymus (L.) Sm. Introduced CODI6

  lesser swinecress · Brassicaceae 4 counties
• 
  Coronopus squamatus (Forssk.) Asch. Introduced COSQ

  greater swinecress · Brassicaceae 3 counties
• 
  Corrigiola litoralis L. Introduced COLI6

  strapwort · Caryophyllaceae 2 counties
• 
  Corydalis aurea Willd. Native COAU2

  scrambled eggs · Fumariaceae 5 counties
• 
  Corydalis flavula (Raf.) DC. Native COFL3

  yellow fumewort · Fumariaceae 35 counties
• 
  Corydalis sempervirens (L.) Pers. Native COSE5

  rock harlequin · Fumariaceae 55 counties
• 
  Corylus americana Walter Native COAM3

  American hazelnut · Betulaceae 63 counties
• 
  Corylus cornuta Marshall Native COCO6

  beaked hazelnut · Betulaceae 49 counties
• 
  Corylus cornuta Marshall var. cornuta Native COCOC2

  beaked hazelnut · Betulaceae 49 counties
• 
  Corynephorus canescens (L.) P. Beauv. Introduced COCA16

  gray clubawn grass · Poaceae 1 county
• 
  Cosmos bipinnatus Cav. Introduced COBI2

  garden cosmos · Asteraceae 11 counties