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 251–300 of 4,111.

• 
  Aralia nudicaulis L. Native ARNU2

  wild sarsaparilla · Araliaceae 6 counties
• 
  Aralia racemosa L. Native ARRA

  American spikenard · Araliaceae 2 counties
• 
  Aralia racemosa L. ssp. bicrenata (Wooton & Standl.) S.L. Welsh & N.D. Atwood Native ARRAB2

  American spikenard · Araliaceae 2 counties
• 
  Arceuthobium americanum Nutt. ex Engelm. Native ARAM

  American dwarf mistletoe · Viscaceae 7 counties
• 
  Arceuthobium cyanocarpum (A. Nelson ex Rydb.) A. Nelson Native ARCY2

  limber pine dwarf mistletoe · Viscaceae 3 counties
• 
  Arceuthobium divaricatum Engelm. Native ARDI3

  pinyon dwarf mistletoe · Viscaceae 4 counties
• 
  Arceuthobium douglasii Engelm. Native ARDO

  Douglas-fir dwarf mistletoe · Viscaceae 2 counties
• 
  Arceuthobium vaginatum (Willd.) J. Presl Native ARVA

  pineland dwarf mistletoe · Viscaceae 12 counties
• 
  Arceuthobium vaginatum (Willd.) J. Presl ssp. cryptopodum (Engelm.) Hawksw. & Wiens Native ARVAC

  pineland dwarf mistletoe · Viscaceae 12 counties
• 
  Arctium lappa L. Introduced ARLA3

  greater burdock · Asteraceae 2 counties
• 
  Arctium minus Bernh. Introduced ARMI2

  lesser burdock · Asteraceae 11 counties
• 
  Arctium tomentosum Mill. Introduced ARTO

  woolly burdock · Asteraceae 2 counties
• 
  Arctostaphylos patula Greene Native ARPA6

  greenleaf manzanita · Ericaceae 6 counties
• 
  Arctostaphylos uva-ursi (L.) Spreng. Native ARUV

  kinnikinnick · Ericaceae 29 counties
• 
  Arenaria congesta Nutt. Native ARCO5

  ballhead sandwort · Caryophyllaceae 14 counties
• 
  Arenaria congesta Nutt. var. congesta Native ARCOC4

  ballhead sandwort · Caryophyllaceae 14 counties
• 
  Arenaria eastwoodiae Rydb. Native AREA

  Eastwood's sandwort · Caryophyllaceae 1 county
• 
  Arenaria eastwoodiae Rydb. var. eastwoodiae Native AREAE

  Eastwood's sandwort · Caryophyllaceae 1 county
• 
  Arenaria fendleri A. Gray Native ARFE3

  Fendler's sandwort · Caryophyllaceae 32 counties
• 
  Arenaria fendleri A. Gray var. fendleri Native ARFEF3

  Fendler's sandwort · Caryophyllaceae 32 counties
• 
  Arenaria hookeri Nutt. Native ARHO4

  Hooker's sandwort · Caryophyllaceae 20 counties
• 
  Arenaria hookeri Nutt. ssp. desertorum (Maguire) W.A. Weber Native ARHOD

  Hooker's desert sandwort · Caryophyllaceae 1 county
• 
  Arenaria hookeri Nutt. ssp. hookeri Native ARHOH3

  Hooker's sandwort · Caryophyllaceae 19 counties
• 
  Arenaria hookeri Nutt. ssp. pinetorum (A. Nelson) W.A. Weber Native ARHOP

  Hooker's sandwort · Caryophyllaceae 8 counties
• 
  Arenaria kingii (S. Watson) M.E. Jones Native ARKI

  King's sandwort · Caryophyllaceae 7 counties
• 
  Arenaria kingii (S. Watson) M.E. Jones ssp. uintahensis (A. Nelson) Maguire Native ARKIU2

  Uinta sandwort · Caryophyllaceae 7 counties
• 
  Arenaria lanuginosa (Michx.) Rohrb. Native ARLA4

  spreading sandwort · Caryophyllaceae 18 counties
• 
  Arenaria lanuginosa (Michx.) Rohrb. ssp. saxosa (A. Gray) Maguire Native ARLAS

  spreading sandwort · Caryophyllaceae 18 counties
• 
  Argemone hispida A. Gray Native ARHI4

  rough pricklypoppy · Papaveraceae 12 counties
• 
  Argemone pleiacantha Greene Native ARPL3

  southwestern pricklypoppy · Papaveraceae 1 county
• 
  Argemone polyanthemos (Fedde) G.B. Ownbey Native ARPO2

  crested pricklypoppy · Papaveraceae 24 counties
• 
  Argemone squarrosa Greene Native ARSQ

  hedgehog pricklypoppy · Papaveraceae 7 counties
• 
  Argemone squarrosa Greene ssp. squarrosa Native ARSQS

  hedgehog pricklypoppy · Papaveraceae 7 counties
• 
  Argentina anserina (L.) Rydb. Native ARAN7

  silverweed cinquefoil · Rosaceae 17 counties
• 
  Argyrochosma fendleri (Kunze) Windham Native ARFE5

  Fendler's false cloak fern · Pteridaceae 14 counties
• 
  Argythamnia humilis (Engelm. & A. Gray) Müll. Arg. Native ARHU5

  low silverbush · Euphorbiaceae 1 county
• 
  Argythamnia humilis (Engelm. & A. Gray) Müll. Arg. var. humilis Native ARHUH

  low silverbush · Euphorbiaceae 1 county
• 
  Argythamnia mercurialina (Nutt.) Müll. Arg. Native ARME5

  tall silverbush · Euphorbiaceae 2 counties
• 
  Argythamnia mercurialina (Nutt.) Müll. Arg. var. mercurialina Native ARMEM

  tall silverbush · Euphorbiaceae 2 counties
• 
  Aristida adscensionis L. Native ARAD

  sixweeks threeawn · Poaceae 9 counties
• 
  Aristida arizonica Vasey Native ARAR6

  Arizona threeawn · Poaceae 2 counties
• 
  Aristida basiramea Engelm. ex Vasey Native ARBA2

  forked threeawn · Poaceae 3 counties
• 
  Aristida divaricata Humb. & Bonpl. ex Willd. Native ARDI5

  poverty threeawn · Poaceae 7 counties
• 
  Aristida havardii Vasey Native ARHA3

  Havard's threeawn · Poaceae 2 counties
• 
  Aristida purpurea Nutt. Native ARPU9

  purple threeawn · Poaceae 39 counties
• 
  Aristida purpurea Nutt. var. fendleriana (Steud.) Vasey Native ARPUF

  Fendler's threeawn · Poaceae 3 counties
• 
  Aristida purpurea Nutt. var. longiseta (Steud.) Vasey Native ARPUL

  Fendler threeawn · Poaceae 28 counties
• 
  Aristida purpurea Nutt. var. nealleyi (Vasey) Allred Native ARPUN

  blue threeawn · Poaceae 3 counties
• 
  Aristida purpurea Nutt. var. purpurea Native ARPUP6

  purple threeawn · Poaceae 25 counties
• 
  Aristida purpurea Nutt. var. wrightii (Nash) Allred Native ARPUW

  Wright's threeawn · Poaceae 2 counties