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Status of Invasive Plants in California

Total number of exotic species reported: 1260

Total number of records in EDDMapS: 54468


Invasive Plants by Category

  • Aquatic - 18 species, 1755 records
  • Cactus - 1 species, 26 records
  • Conifer Trees - 5 species, 19 records
  • Forbs/Herbs - 731 species, 23773 records
  • Grass or Grasslike - 221 species, 13628 records
  • Hardwood Trees - 112 species, 1866 records
  • Palms - 2 species, 101 records
  • Shrub or Subshrub - 121 species, 3492 records
  • Vines - 48 species, 1605 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. cheatgrass - 1946 reports
  2. bull thistle - 1285 reports
  3. giant reed - 638 reports
  4. Geraldton carnation weed - 549 reports
  5. common yarrow - 547 reports
  6. giant salvinia - 504 reports
  7. yellow starthistle - 494 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. bull thistle - 55/58 (95%)
  9. ripgut brome - 55/58 (95%)
  10. red brome - 55/58 (95%)

Counties with the most invasive species reported

  1. San Diego County - 781 species
  2. Los Angeles County - 695 species
  3. Butte County - 653 species
  4. Santa Barbara County - 613 species
  5. Sonoma County - 588 species
  6. Marin County - 565 species
  7. Riverside County - 564 species
  8. San Bernardino County - 535 species
  9. Alameda County - 505 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 - 139 species
  5. San Benito County - 169 species
  6. Madera County - 195 species
  7. Mono County - 200 species
  8. Yuba County - 205 species
  9. Sutter County - 207 species
  10. Amador County - 210 species

Report created on October 21, 2014 at 11:09 AM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.