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Status of Invasive Plants in Colorado

Total number of exotic species reported: 398

Total number of records in EDDMapS: 15576


Invasive Plants by Category

  • Aquatic - 8 species, 258 records
  • Cactus - 1 species, 5 records
  • Forbs/Herbs - 232 species, 8525 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 - 412 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 - 750 species
  2. Boulder County - 394 species
  3. Weld County - 282 species
  4. Jefferson County - 256 species
  5. El Paso County - 226 species
  6. Montezuma County - 220 species
  7. Mesa County - 219 species
  8. Las Animas County - 179 species
  9. Costilla County - 175 species
  10. La Plata County - 170 species

Counties with the least invasive species reported

  1. Broomfield County - 3 species
  2. Phillips County - 32 species
  3. Crowley County - 41 species
  4. Lake County - 42 species
  5. Morgan County - 46 species
  6. Washington County - 50 species
  7. Bent County - 53 species
  8. Kiowa County - 57 species
  9. Prowers County - 57 species
  10. Otero County - 67 species

Report created on December 18, 2014 at 02:28 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.