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Status of Invasive Plants in Montana

Total number of exotic species reported: 403

Total number of records in EDDMapS: 48822


Invasive Plants by Category

  • Aquatic - 12 species, 285 records
  • Forbs/Herbs - 261 species, 41615 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 - 137 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 - 301 species
  2. Missoula County - 286 species
  3. Flathead County - 264 species
  4. Ravalli County - 261 species
  5. Lake County - 252 species
  6. Sanders County - 215 species
  7. Lewis and Clark County - 211 species
  8. Park County - 209 species
  9. Lincoln County - 199 species
  10. Carbon County - 194 species

Counties with the least invasive species reported

  1. Treasure County - 65 species
  2. Golden Valley County - 66 species
  3. Prairie County - 70 species
  4. Wheatland County - 72 species
  5. Liberty County - 73 species
  6. Fallon County - 81 species
  7. Garfield County - 82 species
  8. Richland County - 87 species
  9. Carter County - 88 species
  10. Deer Lodge County - 92 species

Report created on October 21, 2014 at 09:33 AM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.