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Status of Invasive Plants in Illinois

Total number of exotic species reported: 611

Total number of records in EDDMapS: 81844


Invasive Plants by Category

  • Aquatic - 18 species, 6573 records
  • Conifer Trees - 3 species, 60 records
  • Forbs/Herbs - 354 species, 26313 records
  • Grass or Grasslike - 90 species, 8018 records
  • Hardwood Trees - 50 species, 1778 records
  • Shrub or Subshrub - 57 species, 8053 records
  • Vines - 36 species, 3051 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. European buckthorn - 2299 reports
  2. cutleaf teasel - 2268 reports
  3. Eurasian water-milfoil - 1643 reports
  4. multiflora rose - 1445 reports
  5. curly-leaved pondweed - 1289 reports
  6. reed canarygrass - 1209 reports
  7. garlic mustard - 1110 reports
  8. common reed - 968 reports
  9. glossy buckthorn - 744 reports
  10. Queen Anne's lace, wild carrot - 740 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 - 529 species
  2. DuPage County - 478 species
  3. Jackson County - 443 species
  4. Lake County - 424 species
  5. Kane County - 397 species
  6. Will County - 388 species
  7. Champaign County - 363 species
  8. McHenry County - 336 species
  9. Grundy County - 325 species
  10. Peoria County - 323 species

Counties with the least invasive species reported

  1. Warren County - 119 species
  2. Jasper County - 124 species
  3. Clay County - 129 species
  4. Bond County - 133 species
  5. Mercer County - 142 species
  6. Edwards County - 143 species
  7. Stark County - 148 species
  8. Marshall County - 150 species
  9. Brown County - 153 species
  10. Hamilton County - 156 species

Report created on September 1, 2014 at 07:18 AM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.