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Status of Invasive Plants in Illinois

Total number of exotic species reported: 606

Total number of records in EDDMapS: 69132


Invasive Plants by Category

  • Aquatic - 18 species, 5359 records
  • Conifer Trees - 3 species, 13 records
  • Forbs/Herbs - 351 species, 22425 records
  • Grass or Grasslike - 89 species, 6741 records
  • Hardwood Trees - 50 species, 1451 records
  • Shrub or Subshrub - 56 species, 3002 records
  • Vines - 36 species, 2816 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. cutleaf teasel - 2200 reports
  2. Eurasian water-milfoil - 1642 reports
  3. curly-leaved pondweed - 1289 reports
  4. multiflora rose - 736 reports
  5. common reed - 718 reports
  6. brittleleaf naiad - 606 reports
  7. Japanese stiltgrass - 550 reports
  8. Japanese honeysuckle - 535 reports
  9. reed canarygrass - 454 reports
  10. garlic mustard - 391 reports

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

  1. smooth brome - 103/102 (101%)
  2. wild parsnip - 103/102 (101%)
  3. common chickweed - 102/102 (100%)
  4. common mullein - 102/102 (100%)
  5. common yarrow - 102/102 (100%)
  6. orchardgrass - 102/102 (100%)
  7. wild garlic - 102/102 (100%)
  8. common ragweed - 102/102 (100%)
  9. cheatgrass - 102/102 (100%)
  10. shepherd's-purse - 102/102 (100%)

Counties with the most invasive species reported

  1. Cook County - 525 species
  2. DuPage County - 476 species
  3. Jackson County - 447 species
  4. Lake County - 422 species
  5. Kane County - 395 species
  6. Will County - 387 species
  7. Champaign County - 367 species
  8. McHenry County - 332 species
  9. Grundy County - 329 species
  10. Peoria County - 327 species

Counties with the least invasive species reported

  1. Warren County - 123 species
  2. Jasper County - 126 species
  3. Clay County - 131 species
  4. Bond County - 136 species
  5. Edwards County - 145 species
  6. Mercer County - 146 species
  7. Stark County - 152 species
  8. Marshall County - 153 species
  9. Brown County - 156 species
  10. Hamilton County - 158 species

Report created on November 24, 2014 at 04:27 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.