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Status of Invasive Plants in Idaho

Total number of exotic species reported: 436

Total number of records in EDDMapS: 151400


Invasive Plants by Category

  • Aquatic - 12 species, 2619 records
  • Conifer Trees - 1 species, 2 records
  • Forbs/Herbs - 274 species, 130192 records
  • Grass or Grasslike - 72 species, 3092 records
  • Hardwood Trees - 27 species, 1309 records
  • Shrub or Subshrub - 27 species, 2690 records
  • Vines - 23 species, 2493 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. leafy spurge - 31529 reports
  2. spotted knapweed - 14955 reports
  3. Canada thistle - 14506 reports
  4. rush skeletonweed - 8224 reports
  5. musk thistle - 7268 reports
  6. yellow toadflax - 7124 reports
  7. Scotch thistle - 7009 reports
  8. hoary cress - 4688 reports
  9. diffuse knapweed - 3953 reports
  10. Russian knapweed - 3743 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 - 339 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 - 269 species
  7. Canyon County - 224 species
  8. Washington County - 213 species
  9. Bannock County - 213 species
  10. Owyhee 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 - 95 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 March 29, 2015 at 12:07 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.