Colorado

• Adams 08001
  205 taxa Open ↗
• Alamosa 08003
  652 taxa Open ↗
• Arapahoe 08005
  254 taxa Open ↗
• Archuleta 08007
  651 taxa Open ↗
• Baca 08009
  785 taxa Open ↗
• Bent 08011
  267 taxa Open ↗
• Boulder 08013
  1,961 taxa Open ↗
• Broomfield 08014
  0 taxa Open ↗
• Chaffee 08015
  607 taxa Open ↗
• Cheyenne 08017
  694 taxa Open ↗

Showing 2,651–2,700 of 4,111.

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  Oonopsis foliosa (A. Gray) Greene Native OOFO

  leafy false goldenweed · Asteraceae 5 counties
• 
  Oonopsis foliosa (A. Gray) Greene var. foliosa Native OOFOF

  leafy false goldenweed · Asteraceae 2 counties
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  Opuntia fragilis (Nutt.) Haw. Native OPFR

  brittle pricklypear · Cactaceae 21 counties
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  Opuntia macrorhiza Engelm. Native OPMA2

  twistspine pricklypear · Cactaceae 23 counties
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  Opuntia macrorhiza Engelm. var. macrorhiza Native OPMAM3

  twistspine pricklypear · Cactaceae 23 counties
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  Opuntia phaeacantha Engelm. Native OPPH

  tulip pricklypear · Cactaceae 12 counties
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  Opuntia polyacantha Haw. Native OPPO

  plains pricklypear · Cactaceae 37 counties
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  Opuntia polyacantha Haw. var. erinacea (Engelm. & J.M. Bigelow ex Engelm.) Parfitt Native OPPOE

  grizzlybear pricklypear · Cactaceae 1 county
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  Opuntia polyacantha Haw. var. hystricina (Engelm. & J.M. Bigelow) Parfitt Native OPPOH

  grizzlybear pricklypear · Cactaceae 1 county
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  Opuntia polyacantha Haw. var. polyacantha Native OPPOP

  hairspine pricklypear · Cactaceae 29 counties
• 
  Oreochrysum parryi (A. Gray) Rydb. Native ORPA3

  Parry's goldenrod · Asteraceae 31 counties
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  Oreoxis alpina (A. Gray) J.M. Coult. & Rose Native ORAL

  alpine oreoxis · Apiaceae 18 counties
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  Oreoxis alpina (A. Gray) J.M. Coult. & Rose ssp. alpina Native ORALA

  alpine oreoxis · Apiaceae 14 counties
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  Oreoxis alpina (A. Gray) J.M. Coult. & Rose ssp. puberulenta W.A. Weber Native ORALP

  alpine oreoxis · Apiaceae 6 counties
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  Oreoxis bakeri J.M. Coult. & Rose Native ORBA

  Baker's alpineparsley · Apiaceae 9 counties
• 
  Oreoxis humilis Raf. Native ORHU

  Rocky Mountain alpineparsley · Apiaceae 1 county
• 
  Orobanche cooperi (A. Gray) A. Heller Native ORCO4

  desert broomrape · Orobanchaceae 1 county
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  Orobanche corymbosa (Rydb.) Ferris Native ORCO5

  flat-top broomrape · Orobanchaceae 1 county
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  Orobanche corymbosa (Rydb.) Ferris ssp. corymbosa Native ORCOC3

  flat-top broomrape · Orobanchaceae 1 county
• 
  Orobanche fasciculata Nutt. Native ORFA

  clustered broomrape · Orobanchaceae 33 counties
• 
  Orobanche ludoviciana Nutt. Native ORLU

  Louisiana broomrape · Orobanchaceae 16 counties
• 
  Orobanche ludoviciana Nutt. ssp. ludoviciana Native ORLUL2

  Louisiana broomrape · Orobanchaceae 2 counties
• 
  Orobanche ludoviciana Nutt. ssp. multiflora (Nutt.) T.S. Collins ex H.L. White & W.C. Holmes Native ORLUM

  manyflower broomrape · Orobanchaceae 11 counties
• 
  Orobanche riparia L.T. Collins Native ORRI

  River Broom-Rape · Orobanchaceae 6 counties
• 
  Orobanche uniflora L. Native ORUN

  oneflowered broomrape · Orobanchaceae 14 counties
• 
  Orogenia linearifolia S. Watson Native ORLI

  Great Basin Indian potato · Apiaceae 4 counties
• 
  Orthilia secunda (L.) House Native ORSE

  sidebells wintergreen · Pyrolaceae 33 counties
• 
  Orthocarpus luteus Nutt. Native ORLU2

  yellow owl's-clover · Scrophulariaceae 33 counties
• 
  Orthocarpus purpureoalbus A. Gray ex S. Watson Native ORPU2

  purplewhite owl's-clover · Scrophulariaceae 7 counties
• 
  Oryzopsis asperifolia Michx. Native ORAS

  roughleaf ricegrass · Poaceae 14 counties
• 
  Osmorhiza berteroi DC. Native OSBE

  sweetcicely · Apiaceae 6 counties
• 
  Osmorhiza depauperata Phil. Native OSDE

  bluntseed sweetroot · Apiaceae 26 counties
• 
  Osmorhiza longistylis (Torr.) DC. Native OSLO

  longstyle sweetroot · Apiaceae 7 counties
• 
  Osmorhiza occidentalis (Nutt. ex Torr. & A. Gray) Torr. Native OSOC

  western sweetroot · Apiaceae 12 counties
• 
  Oxalis albicans Kunth Native OXAL

  radishroot woodsorrel · Oxalidaceae 1 county
• 
  Oxalis albicans Kunth ssp. albicans Native OXALA

  radishroot woodsorrel · Oxalidaceae 1 county
• 
  Oxalis dillenii Jacq. Native OXDI2

  slender yellow woodsorrel · Oxalidaceae 9 counties
• 
  Oxalis stricta L. Native OXST

  common yellow oxalis · Oxalidaceae 6 counties
• 
  Oxalis violacea L. Native OXVI

  violet woodsorrel · Oxalidaceae 4 counties
• 
  Oxypolis fendleri (A. Gray) A. Heller Native OXFE

  Fendler's cowbane · Apiaceae 31 counties
• 
  Oxyria digyna (L.) Hill Native OXDI3

  alpine mountainsorrel · Polygonaceae 29 counties
• 
  Oxytenia acerosa Nutt. Native OXAC4

  copperweed · Asteraceae 3 counties
• 
  Oxytropis besseyi (Rydb.) Blank. Native OXBE2

  Bessey's locoweed · Fabaceae 1 county
• 
  Oxytropis besseyi (Rydb.) Blank. var. obnapiformis (Ced. Porter) S.L. Welsh Native OXBEO

  Bessey's locoweed · Fabaceae 1 county
• 
  Oxytropis borealis DC. Native OXBO

  boreal locoweed · Fabaceae 4 counties
• 
  Oxytropis borealis DC. var. viscida (Nutt.) S.L. Welsh Native OXBOV

  viscid locoweed · Fabaceae 4 counties
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  Oxytropis campestris (L.) DC. Native OXCA4

  field locoweed · Fabaceae 6 counties
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  Oxytropis deflexa (Pall.) DC. Native OXDE2

  nodding locoweed · Fabaceae 21 counties
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  Oxytropis deflexa (Pall.) DC. var. sericea Torr. & A. Gray Native OXDES

  blue nodding locoweed · Fabaceae 17 counties
• 
  Oxytropis lambertii Pursh Native OXLA3

  purple locoweed · Fabaceae 42 counties