Oregon

• Baker 41001
  1,572 taxa Open ↗
• Benton 41003
  1,855 taxa Open ↗
• Clackamas 41005
  1,485 taxa Open ↗
• Clatsop 41007
  979 taxa Open ↗
• Columbia 41009
  1,183 taxa Open ↗
• Coos 41011
  1,238 taxa Open ↗
• Crook 41013
  1,354 taxa Open ↗
• Curry 41015
  1,738 taxa Open ↗
• Deschutes 41017
  1,482 taxa Open ↗
• Douglas 41019
  2,250 taxa Open ↗

Showing 1,201–1,250 of 5,518.

• 
  Centaurea cyanus L. Introduced CECY2

  garden cornflower · Asteraceae 23 counties
• 
  Centaurea diffusa Lam. Introduced CEDI3

  diffuse knapweed · Asteraceae 30 counties
• 
  Centaurea iberica Trevir. ex Spreng. Introduced CEIB

  Iberian knapweed · Asteraceae 1 county
• 
  Centaurea jacea L. Introduced CEJA

  brownray knapweed · Asteraceae 9 counties
• 
  Centaurea macrocephala Puschk. ex Willd. Introduced CEMA9

  bighead knapweed · Asteraceae 1 county
• 
  Centaurea melitensis L. Introduced CEME2

  Maltese star-thistle · Asteraceae 13 counties
• 
  Centaurea montana L. Introduced CEMO

  perennial cornflower · Asteraceae 6 counties
• 
  Centaurea nigra L. Introduced CENI2

  lesser knapweed · Asteraceae 5 counties
• 
  Centaurea nigrescens Willd. Introduced CENI3

  Tyrol knapweed · Asteraceae 14 counties
• 
  Centaurea solstitialis L. Introduced CESO3

  yellow star-thistle · Asteraceae 28 counties
• 
  Centaurea stoebe L. Introduced CEST8

  spotted knapweed · Asteraceae 31 counties
• 
  Centaurea stoebe L. ssp. micranthos (Gugler) Hayek Introduced CESTM

  spotted knapweed · Asteraceae 31 counties
• 
  Centaurea virgata Lam. Introduced CEVI

  squarrose knapweed · Asteraceae 5 counties
• 
  Centaurea virgata Lam. ssp. squarrosa (Willd.) Gugler Introduced CEVIS2

  squarrose knapweed · Asteraceae 5 counties
• 
  Centaurium erythraea Rafn Introduced CEER5

  European centaury · Gentianaceae 19 counties
• 
  Centaurium exaltatum (Griseb.) W. Wight ex Piper Native CEEX

  desert centaury · Gentianaceae 17 counties
• 
  Centaurium muehlenbergii (Griseb.) W. Wight ex Piper Native CEMU2

  Muhlenberg's centaury · Gentianaceae 14 counties
• 
  Centranthus ruber (L.) DC. Introduced CERU2

  red valerian · Valerianaceae 5 counties
• 
  Centromadia pungens (Hook. & Arn.) Greene Native CEPU14

  common tarweed · Asteraceae 12 counties
• 
  Centromadia pungens (Hook. & Arn.) Greene ssp. pungens Native CEPUP6

  common tarweed · Asteraceae 8 counties
• 
  Centromadia pungens (Hook. & Arn.) Greene ssp. septentrionalis (D.D. Keck) B.G. Baldw. Native CEPUS2

  common tarweed · Asteraceae 6 counties
• 
  Cephalanthera austiniae (A. Gray) A. Heller Native CEAU

  phantom orchid · Orchidaceae 17 counties
• 
  Cerastium arvense L. Both CEAR4

  field chickweed · Caryophyllaceae 24 counties
• 
  Cerastium arvense L. ssp. strictum (L.) Ugborogho Native CEARS2

  field chickweed · Caryophyllaceae 1 county
• 
  Cerastium beeringianum Cham. & Schltdl. Native CEBE2

  Bering chickweed · Caryophyllaceae 2 counties
• 
  Cerastium beeringianum Cham. & Schltdl. ssp. earlei (Rydb.) Hultén Native CEBEE

  Bering chickweed · Caryophyllaceae 2 counties
• 
  Cerastium brachypetalum Pers. Introduced CEBR2

  gray chickweed · Caryophyllaceae 1 county
• 
  Cerastium dichotomum L. Introduced CEDI5

  forked chickweed · Caryophyllaceae 5 counties
• 
  Cerastium dubium (Bast.) Guépin Introduced CEDU2

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

  common mouse-ear chickweed · Caryophyllaceae 33 counties
• 
  Cerastium fontanum Baumg. ssp. vulgare (Hartm.) Greuter & Burdet Introduced CEFOV2

  big chickweed · Caryophyllaceae 33 counties
• 
  Cerastium glomeratum Thuill. Introduced CEGL2

  sticky chickweed · Caryophyllaceae 30 counties
• 
  Cerastium nutans Raf. Native CENU2

  nodding chickweed · Caryophyllaceae 14 counties
• 
  Cerastium nutans Raf. var. nutans Native CENUN

  nodding chickweed · Caryophyllaceae 14 counties
• 
  Cerastium semidecandrum L. Introduced CESE4

  fivestamen chickweed · Caryophyllaceae 4 counties
• 
  Cerastium tomentosum L. Introduced CETO2

  snow in summer · Caryophyllaceae 1 county
• 
  Ceratocephala testiculata (Crantz) Roth Introduced CETE5

  curveseed butterwort · Ranunculaceae 21 counties
• 
  Ceratophyllum demersum L. Native CEDE4

  coon's tail · Ceratophyllaceae 17 counties
• 
  Ceratophyllum echinatum A. Gray Native CEEC2

  spineless hornwort · Ceratophyllaceae 1 county
• 
  Cercocarpus ledifolius Nutt. Native CELE3

  curl-leaf mountain mahogany · Rosaceae 15 counties
• 
  Cercocarpus ledifolius Nutt. var. intercedens C.K. Schneid. Native CELEI

  curl-leaf mountain mahogany · Rosaceae 14 counties
• 
  Cercocarpus ledifolius Nutt. var. ledifolius Native CELEL

  curl-leaf mountain mahogany · Rosaceae 2 counties
• 
  Cercocarpus montanus Raf. Native CEMO2

  alderleaf mountain mahogany · Rosaceae 7 counties
• 
  Cercocarpus montanus Raf. var. glaber (S. Watson) F.L. Martin Native CEMOG

  birchleaf mountain mahogany · Rosaceae 6 counties
• 
  Cercocarpus montanus Raf. var. macrourus (Rydb.) F.L. Martin Native CEMOM2

  Klamath mountain mahogany · Rosaceae 5 counties
• 
  Chaenactis cusickii A. Gray Native CHCU

  Cusick's pincushion · Asteraceae 2 counties
• 
  Chaenactis douglasii (Hook.) Hook. & Arn. Native CHDO

  Douglas' dustymaiden · Asteraceae 24 counties
• 
  Chaenactis douglasii (Hook.) Hook. & Arn. var. alpina A. Gray Native CHDOA2

  alpine dustymaiden · Asteraceae 4 counties
• 
  Chaenactis douglasii (Hook.) Hook. & Arn. var. douglasii Native CHDOD

  Douglas' dustymaiden · Asteraceae 22 counties
• 
  Chaenactis macrantha D.C. Eaton Native CHMA

  bighead dustymaiden · Asteraceae 3 counties