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Status of Invasive Plants in Montana

Total number of exotic species reported: 403

Total number of records in EDDMapS: 48489


Invasive Plants by Category

  • Aquatic - 12 species, 285 records
  • Forbs/Herbs - 261 species, 41614 records
  • Grass or Grasslike - 67 species, 1927 records
  • Hardwood Trees - 20 species, 147 records
  • Shrub or Subshrub - 25 species, 1212 records
  • Vines - 18 species, 486 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. Dalmatian toadflax - 27460 reports
  2. Canada thistle - 5493 reports
  3. Russian olive - 871 reports
  4. spotted knapweed - 576 reports
  5. tansy ragwort - 250 reports
  6. musk thistle - 168 reports
  7. sulfur cinquefoil - 136 reports
  8. leafy spurge - 135 reports
  9. Russian knapweed - 120 reports
  10. field bindweed - 118 reports

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

  1. Canada thistle - 56/56 (100%)
  2. spotted knapweed - 56/56 (100%)
  3. leafy spurge - 56/56 (100%)
  4. field bindweed - 56/56 (100%)
  5. Russian knapweed - 56/56 (100%)
  6. prickly lettuce - 56/56 (100%)
  7. field pennycress - 56/56 (100%)
  8. western salsify - 56/56 (100%)
  9. bull thistle - 55/56 (98%)
  10. common yarrow - 55/56 (98%)

Counties with the most invasive species reported

  1. Gallatin County - 293 species
  2. Missoula County - 275 species
  3. Flathead County - 252 species
  4. Ravalli County - 250 species
  5. Lake County - 241 species
  6. Sanders County - 204 species
  7. Park County - 203 species
  8. Lewis and Clark County - 202 species
  9. Yellowstone County - 190 species
  10. Carbon County - 188 species

Counties with the least invasive species reported

  1. Golden Valley County - 62 species
  2. Treasure County - 64 species
  3. Wheatland County - 66 species
  4. Prairie County - 70 species
  5. Liberty County - 70 species
  6. Garfield County - 80 species
  7. Fallon County - 81 species
  8. Deer Lodge County - 84 species
  9. Richland County - 87 species
  10. Carter County - 87 species

Report created on August 21, 2014 at 11:59 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.