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Status of Invasive Plants in Idaho

Total number of exotic species reported: 438

Total number of records in EDDMapS: 164029


Invasive Plants by Category

  • Aquatic - 13 species, 2646 records
  • Conifer Trees - 1 species, 2 records
  • Forbs/Herbs - 275 species, 136019 records
  • Grass or Grasslike - 72 species, 9371 records
  • Hardwood Trees - 27 species, 1338 records
  • Shrub or Subshrub - 26 species, 3067 records
  • Vines - 23 species, 2558 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. leafy spurge - 31529 reports
  2. spotted knapweed - 15960 reports
  3. Canada thistle - 15195 reports
  4. rush skeletonweed - 9022 reports
  5. Scotch thistle - 7806 reports
  6. musk thistle - 7460 reports
  7. yellow toadflax - 7270 reports
  8. yellow foxtail - 7071 reports
  9. hoary cress - 4871 reports
  10. houndstongue - 4074 reports

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

  1. Canada thistle - 44/44 (100%)
  2. spotted knapweed - 44/44 (100%)
  3. field bindweed - 44/44 (100%)
  4. Scotch thistle - 44/44 (100%)
  5. cheatgrass - 44/44 (100%)
  6. musk thistle - 43/44 (98%)
  7. poison-hemlock - 43/44 (98%)
  8. Russian knapweed - 43/44 (98%)
  9. hoary cress - 43/44 (98%)
  10. leafy spurge - 42/44 (95%)

Counties with the most invasive species reported

  1. Idaho County - 343 species
  2. Latah County - 322 species
  3. Ada County - 289 species
  4. Kootenai County - 285 species
  5. Nez Perce County - 276 species
  6. Bonner County - 271 species
  7. Canyon County - 224 species
  8. Washington County - 215 species
  9. Bannock County - 214 species
  10. Adams County - 208 species

Counties with the least invasive species reported

  1. Jerome County - 53 species
  2. Minidoka County - 66 species
  3. Camas County - 80 species
  4. Lincoln County - 84 species
  5. Jefferson County - 97 species
  6. Oneida County - 99 species
  7. Payette County - 106 species
  8. Teton County - 107 species
  9. Franklin County - 115 species
  10. Gooding County - 120 species

Report created on May 25, 2015 at 09:23 AM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.