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 1–50 of 434 (introduced).

• 
  Abutilon theophrasti Medik. Introduced ABTH

  velvetleaf · Malvaceae 2 counties
• 
  Acorus calamus L. Introduced ACCA4

  calamus · Acoraceae 2 counties
• 
  Acroptilon repens (L.) DC. Introduced ACRE3

  hardheads · Asteraceae 18 counties
• 
  Aegilops cylindrica Host Introduced AECY

  jointed goatgrass · Poaceae 15 counties
• 
  Agropyron cristatum (L.) Gaertn. Introduced AGCR

  crested wheatgrass · Poaceae 32 counties
• 
  Agropyron cristatum (L.) Gaertn. ssp. cristatum Introduced AGCRC

  crested wheatgrass · Poaceae 2 counties
• 
  Agropyron cristatum (L.) Gaertn. ssp. pectinatum (M. Bieb.) Tzvelev Introduced AGCRP8

  crested wheatgrass · Poaceae 31 counties
• 
  Agropyron desertorum (Fisch. ex Link) Schult. Introduced AGDE2

  desert wheatgrass · Poaceae 17 counties
• 
  Agropyron fragile (Roth) P. Candargy Introduced AGFR

  Siberian wheatgrass · Poaceae 8 counties
• ⚘
  Agrostemma brachyloba (Fenzl) Hammer Introduced AGBR4

  narrow corncockle · Caryophyllaceae 1 county
• 
  Agrostis gigantea Roth Introduced AGGI2

  redtop · Poaceae 34 counties
• 
  Agrostis stolonifera L. Introduced AGST2

  creeping bentgrass · Poaceae 17 counties
• 
  Ailanthus altissima (Mill.) Swingle Introduced AIAL

  tree of heaven · Simaroubaceae 4 counties
• 
  Alhagi maurorum Medik. Introduced ALMA12

  camelthorn · Fabaceae 1 county
• 
  Alliaria petiolata (M. Bieb.) Cavara & Grande Introduced ALPE4

  garlic mustard · Brassicaceae 2 counties
• 
  Allium sativum L. Introduced ALSA2

  cultivated garlic · Liliaceae 1 county
• 
  Alopecurus arundinaceus Poir. Introduced ALAR

  creeping meadow foxtail · Poaceae 2 counties
• 
  Alopecurus geniculatus L. Introduced ALGE2

  water foxtail · Poaceae 1 county
• 
  Alopecurus geniculatus L. var. geniculatus Introduced ALGEG4

  water foxtail · Poaceae 1 county
• 
  Alopecurus pratensis L. Introduced ALPR3

  meadow foxtail · Poaceae 11 counties
• 
  Alyssum alyssoides (L.) L. Introduced ALAL3

  pale madwort · Brassicaceae 12 counties
• 
  Alyssum desertorum Stapf Introduced ALDE

  desert madwort · Brassicaceae 13 counties
• 
  Alyssum desertorum Stapf var. desertorum Introduced ALDED

  desert madwort · Brassicaceae 13 counties
• 
  Alyssum murale Waldst. & Kit. Introduced ALMU

  yellowtuft · Brassicaceae 1 county
• 
  Alyssum simplex Rudolphi Introduced ALSI8

  alyssum · Brassicaceae 20 counties
• 
  Amaranthus albus L. Introduced AMAL

  prostrate pigweed · Amaranthaceae 15 counties
• 
  Amaranthus blitoides S. Watson Introduced AMBL

  mat amaranth · Amaranthaceae 20 counties
• 
  Ambrosia artemisiifolia L. var. elatior (L.) Descourtils Introduced AMARE

  annual ragweed · Asteraceae 12 counties
• 
  Anagallis arvensis L. Introduced ANAR

  scarlet pimpernel · Primulaceae 1 county
• 
  Anagallis arvensis L. ssp. foemina (Mill.) Schinz & Thell. Introduced ANARF

  poorman's weatherglass · Primulaceae 1 county
• 
  Anchusa azurea Mill. Introduced ANAZ

  Italian bugloss · Boraginaceae 3 counties
• 
  Anchusa officinalis L. Introduced ANOF

  common bugloss · Boraginaceae 1 county
• 
  Anethum graveolens L. Introduced ANGR2

  dill · Apiaceae 1 county
• 
  Anthemis arvensis L. Introduced ANAR6

  corn chamomile · Asteraceae 1 county
• 
  Anthemis cotula L. Introduced ANCO2

  stinking chamomile · Asteraceae 5 counties
• 
  Anthemis tinctoria L. Introduced ANTI

  golden chamomile · Asteraceae 1 county
• 
  Apera interrupta (L.) P. Beauv. Introduced APIN

  dense silkybent · Poaceae 2 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
• 
  Armoracia rusticana G. Gaertn., B. Mey. & Scherb. Introduced ARRU4

  horseradish · Brassicaceae 3 counties
• 
  Arrhenatherum elatius (L.) P. Beauv. ex J. Presl & C. Presl Introduced AREL3

  tall oatgrass · Poaceae 4 counties
• 
  Arrhenatherum elatius (L.) P. Beauv. ex J. Presl & C. Presl var. elatius Introduced ARELE

  tall oatgrass · Poaceae 4 counties
• 
  Artemisia absinthium L. Introduced ARAB3

  absinthium · Asteraceae 3 counties
• 
  Artemisia annua L. Introduced ARAN3

  sweet sagewort · Asteraceae 1 county
• 
  Artemisia biennis Willd. var. biennis Introduced ARBIB

  biennial wormwood · Asteraceae 18 counties
• 
  Asparagus officinalis L. Introduced ASOF

  garden asparagus · Liliaceae 17 counties
• 
  Asperugo procumbens L. Introduced ASPR

  German-madwort · Boraginaceae 5 counties
• 
  Astragalus cicer L. Introduced ASCI4

  chickpea milkvetch · Fabaceae 9 counties
• 
  Astragalus falcatus Lam. Introduced ASFA3

  Russian milkvetch · Fabaceae 3 counties