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Status of Invasive Plants in Iowa

Total number of exotic species reported: 361

Total number of records in EDDMapS: 16458


Invasive Plants by Category

  • Aquatic - 13 species, 1460 records
  • Forbs/Herbs - 213 species, 7202 records
  • Grass or Grasslike - 55 species, 2443 records
  • Hardwood Trees - 25 species, 431 records
  • Shrub or Subshrub - 34 species, 695 records
  • Vines - 21 species, 521 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. curly-leaved pondweed - 524 reports
  2. Eurasian water-milfoil - 407 reports
  3. brittleleaf naiad - 195 reports
  4. wild parsnip - 152 reports
  5. multiflora rose - 149 reports
  6. cheatgrass - 144 reports
  7. quackgrass - 144 reports
  8. curly dock - 140 reports
  9. Canada thistle - 139 reports
  10. smooth brome - 135 reports

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

  1. Canada thistle - 99/99 (100%)
  2. bull thistle - 99/99 (100%)
  3. velvetleaf - 99/99 (100%)
  4. black mustard - 99/99 (100%)
  5. yellow sweet-clover - 99/99 (100%)
  6. broadleaf plantain - 99/99 (100%)
  7. ladysthumb - 99/99 (100%)
  8. curly dock - 99/99 (100%)
  9. curly dock - 99/99 (100%)
  10. stinking chamomile - 98/99 (99%)

Counties with the most invasive species reported

  1. Story County - 267 species
  2. Page County - 204 species
  3. Scott County - 202 species
  4. Johnson County - 189 species
  5. Linn County - 188 species
  6. Fremont County - 180 species
  7. Des Moines County - 178 species
  8. Polk County - 176 species
  9. Dubuque County - 173 species
  10. Muscatine County - 170 species

Counties with the least invasive species reported

  1. Franklin County - 54 species
  2. Monroe County - 56 species
  3. Worth County - 60 species
  4. Mitchell County - 65 species
  5. Buena Vista County - 69 species
  6. Grundy County - 70 species
  7. Calhoun County - 70 species
  8. Keokuk County - 72 species
  9. Bremer County - 74 species
  10. Davis County - 74 species

Report created on August 1, 2014 at 06:30 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.