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Status of Invasive Plants in Utah

Total number of exotic species reported: 440

Total number of records in EDDMapS: 145870


Invasive Plants by Category

  • Aquatic - 8 species, 2309 records
  • Forbs/Herbs - 249 species, 114918 records
  • Grass or Grasslike - 86 species, 7515 records
  • Hardwood Trees - 34 species, 9422 records
  • Shrub or Subshrub - 33 species, 5635 records
  • Vines - 18 species, 2758 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. squarrose knapweed - 31574 reports
  2. musk thistle - 12826 reports
  3. saltcedar - 9003 reports
  4. hoary cress - 8186 reports
  5. Scotch thistle - 6960 reports
  6. houndstongue - 5976 reports
  7. Canada thistle - 5875 reports
  8. Russian knapweed - 4552 reports
  9. perennial pepperweed - 3972 reports
  10. tamarisk - 3414 reports

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

  1. Russian olive - 29/29 (100%)
  2. musk thistle - 29/29 (100%)
  3. Canada thistle - 29/29 (100%)
  4. common mullein - 29/29 (100%)
  5. bull thistle - 29/29 (100%)
  6. common yarrow - 29/29 (100%)
  7. field bindweed - 29/29 (100%)
  8. Russian knapweed - 29/29 (100%)
  9. creeping bentgrass - 29/29 (100%)
  10. prostrate pigweed - 29/29 (100%)

Counties with the most invasive species reported

  1. Kane County - 703 species
  2. Garfield County - 536 species
  3. Utah County - 358 species
  4. Salt Lake County - 352 species
  5. Washington County - 312 species
  6. Cache County - 281 species
  7. Weber County - 231 species
  8. Uintah County - 207 species
  9. Box Elder County - 200 species
  10. San Juan County - 199 species

Counties with the least invasive species reported

  1. Morgan County - 109 species
  2. Iron County - 121 species
  3. Piute County - 122 species
  4. Beaver County - 136 species
  5. Carbon County - 137 species
  6. Wayne County - 142 species
  7. Daggett County - 144 species
  8. Emery County - 148 species
  9. Rich County - 153 species
  10. Sevier County - 158 species

Report created on August 21, 2014 at 04:04 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.