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Status of Invasive Plants in Illinois

Total number of exotic species reported: 604

Total number of records in EDDMapS: 71073


Invasive Plants by Category

  • Aquatic - 19 species, 5362 records
  • Conifer Trees - 3 species, 13 records
  • Forbs/Herbs - 348 species, 24014 records
  • Grass or Grasslike - 89 species, 6741 records
  • Hardwood Trees - 50 species, 1453 records
  • Shrub or Subshrub - 56 species, 3003 records
  • Vines - 35 species, 2820 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. cutleaf teasel - 2200 reports
  2. Eurasian water-milfoil - 1642 reports
  3. poison-hemlock - 1336 reports
  4. curly-leaved pondweed - 1289 reports
  5. wild parsnip - 992 reports
  6. multiflora rose - 736 reports
  7. common reed - 718 reports
  8. brittleleaf naiad - 606 reports
  9. Japanese stiltgrass - 550 reports
  10. Japanese honeysuckle - 535 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 - 526 species
  2. DuPage County - 475 species
  3. Jackson County - 446 species
  4. Lake County - 423 species
  5. Kane County - 394 species
  6. Will County - 386 species
  7. Champaign County - 367 species
  8. McHenry County - 332 species
  9. Grundy County - 328 species
  10. Peoria County - 326 species

Counties with the least invasive species reported

  1. Warren County - 122 species
  2. Jasper County - 128 species
  3. Clay County - 133 species
  4. Bond County - 135 species
  5. Edwards County - 146 species
  6. Mercer County - 146 species
  7. Stark County - 151 species
  8. Marshall County - 152 species
  9. Brown County - 156 species
  10. Ford County - 157 species

Report created on July 4, 2015 at 08:11 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.