eddmapslogo

Status of Invasive Plants in Colorado

Total number of exotic species reported: 399

Total number of records in EDDMapS: 15213


Invasive Plants by Category

  • Aquatic - 8 species, 258 records
  • Cactus - 1 species, 5 records
  • Forbs/Herbs - 232 species, 8526 records
  • Grass or Grasslike - 87 species, 2567 records
  • Hardwood Trees - 19 species, 333 records
  • Shrub or Subshrub - 26 species, 748 records
  • Vines - 15 species, 399 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. Canada thistle - 745 reports
  2. musk thistle - 654 reports
  3. yellow toadflax - 413 reports
  4. Dalmatian toadflax - 354 reports
  5. diffuse knapweed - 336 reports
  6. cheatgrass - 327 reports
  7. leafy spurge - 323 reports
  8. Russian olive - 303 reports
  9. houndstongue - 276 reports
  10. Scotch thistle - 253 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. Larimer County - 742 species
  2. Boulder County - 385 species
  3. Weld County - 279 species
  4. Jefferson County - 249 species
  5. El Paso County - 217 species
  6. Montezuma County - 213 species
  7. Mesa County - 211 species
  8. Las Animas County - 172 species
  9. Costilla County - 167 species
  10. La Plata County - 162 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 - 45 species
  5. Washington County - 49 species
  6. Bent County - 52 species
  7. Kiowa County - 56 species
  8. Prowers County - 56 species
  9. Ouray County - 61 species
  10. Otero County - 65 species

Report created on July 28, 2014 at 08:35 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.