Status of Invasive Plants in Colorado

Total number of exotic species reported: 389

Total number of records in EDDMapS: 14952


Invasive Plants by Category

  • Aquatic - 8 species, 246 records
  • Cactus - 1 species, 5 records
  • Forbs/Herbs - 225 species, 8270 records
  • Grass or Grasslike - 79 species, 2338 records
  • Hardwood Trees - 19 species, 320 records
  • Shrub or Subshrub - 26 species, 719 records
  • Vines - 15 species, 388 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. Canada thistle - 737 reports
  2. musk thistle - 643 reports
  3. yellow toadflax - 413 reports
  4. Dalmatian toadflax - 344 reports
  5. diffuse knapweed - 333 reports
  6. cheatgrass - 326 reports
  7. leafy spurge - 302 reports
  8. Russian olive - 274 reports
  9. houndstongue - 269 reports
  10. tamarisk - 239 reports

Top Ten Widespread Invasive Plants (by number of positive counties)

  1. cheatgrass - 63/64 (98%)
  2. flixweed - 60/64 (94%)
  3. yellow sweet-clover - 60/64 (94%)
  4. smooth brome - 57/64 (89%)
  5. western salsify - 57/64 (89%)
  6. crested wheatgrass - 57/64 (89%)
  7. Canada thistle - 53/64 (83%)
  8. field brome - 52/64 (81%)
  9. intermediate wheatgrass - 52/64 (81%)
  10. field bindweed - 49/64 (77%)

Counties with the most invasive species reported

  1. Boulder County - 336 species
  2. Larimer County - 280 species
  3. Jefferson County - 247 species
  4. El Paso County - 214 species
  5. Montezuma County - 213 species
  6. Mesa County - 212 species
  7. Weld County - 182 species
  8. Las Animas County - 171 species
  9. La Plata County - 162 species
  10. Gunnison County - 158 species

Counties with the least invasive species reported

  1. Phillips County - 31 species
  2. Lake County - 35 species
  3. Crowley County - 40 species
  4. Morgan County - 44 species
  5. Washington County - 48 species
  6. Bent County - 49 species
  7. Kiowa County - 56 species
  8. Prowers County - 56 species
  9. Ouray County - 61 species
  10. Otero County - 65 species

Report created on April 23, 2014 at 10:13 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.



Bugwood Center Developed by The University of Georgia - Center for Invasive Species and Ecosystem Health.
Last updated on Tuesday, December 04, 2012 at 08:59 AM