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Status of Invasive Plants in Illinois

Total number of exotic species reported: 601

Total number of records in EDDMapS: 71030


Invasive Plants by Category

  • Aquatic - 19 species, 5324 records
  • Conifer Trees - 3 species, 13 records
  • Forbs/Herbs - 346 species, 23776 records
  • Grass or Grasslike - 88 species, 6743 records
  • Hardwood Trees - 51 species, 1454 records
  • Shrub or Subshrub - 55 species, 2933 records
  • Vines - 35 species, 2829 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. cutleaf teasel - 2200 reports
  2. Eurasian water-milfoil - 1640 reports
  3. poison-hemlock - 1336 reports
  4. curly-leaved pondweed - 1285 reports
  5. wild parsnip - 992 reports
  6. multiflora rose - 736 reports
  7. common reed - 717 reports
  8. brittleleaf naiad - 601 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. timothy - 102/102 (100%)
  4. buckhorn plantain - 102/102 (100%)
  5. Canada bluegrass - 102/102 (100%)
  6. common purslane - 102/102 (100%)
  7. red sorrel - 102/102 (100%)
  8. prickly lettuce - 102/102 (100%)
  9. meadow fescue - 102/102 (100%)
  10. black medic - 102/102 (100%)

Counties with the most invasive species reported

  1. Cook County - 525 species
  2. DuPage County - 473 species
  3. Jackson County - 445 species
  4. Lake County - 422 species
  5. Kane County - 393 species
  6. Will County - 386 species
  7. Champaign County - 368 species
  8. McHenry County - 331 species
  9. Grundy County - 327 species
  10. Peoria County - 325 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 - 155 species
  10. Ford County - 156 species

Report created on September 1, 2015 at 08:11 AM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.