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Status of Invasive Plants in California

Total number of exotic species reported: 1245

Total number of records in EDDMapS: 54534


Invasive Plants by Category

  • Aquatic - 17 species, 1754 records
  • Cactus - 1 species, 26 records
  • Conifer Trees - 5 species, 19 records
  • Forbs/Herbs - 723 species, 23531 records
  • Grass or Grasslike - 218 species, 13615 records
  • Hardwood Trees - 111 species, 1866 records
  • Palms - 2 species, 102 records
  • Shrub or Subshrub - 120 species, 3464 records
  • Vines - 47 species, 1619 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. cheatgrass - 1946 reports
  2. bull thistle - 1288 reports
  3. giant reed - 635 reports
  4. common yarrow - 564 reports
  5. Geraldton carnation weed - 547 reports
  6. giant salvinia - 504 reports
  7. yellow starthistle - 496 reports
  8. hedgehog dogtailgrass - 492 reports
  9. Himalayan blackberry - 466 reports
  10. purple pampasgrass - 463 reports

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

  1. yellow starthistle - 57/58 (98%)
  2. redstem filaree - 57/58 (98%)
  3. common yarrow - 56/58 (97%)
  4. prickly lettuce - 56/58 (97%)
  5. curly dock - 56/58 (97%)
  6. rattail fescue - 56/58 (97%)
  7. white willow - 56/58 (97%)
  8. rabbitfoot polypogon - 55/58 (95%)
  9. perennial pepperweed - 55/58 (95%)
  10. bull thistle - 55/58 (95%)

Counties with the most invasive species reported

  1. San Diego County - 779 species
  2. Los Angeles County - 690 species
  3. Butte County - 650 species
  4. Santa Barbara County - 612 species
  5. Sonoma County - 585 species
  6. Riverside County - 563 species
  7. Marin County - 562 species
  8. San Bernardino County - 532 species
  9. Alameda County - 506 species
  10. San Luis Obispo County - 494 species

Counties with the least invasive species reported

  1. Kings County - 53 species
  2. Alpine County - 103 species
  3. Sierra County - 114 species
  4. Imperial County - 138 species
  5. San Benito County - 168 species
  6. Madera County - 194 species
  7. Mono County - 198 species
  8. Yuba County - 206 species
  9. Sutter County - 207 species
  10. Amador County - 209 species

Report created on September 2, 2015 at 07:51 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.