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Status of Invasive Plants in California

Total number of exotic species reported: 1263

Total number of records in EDDMapS: 54670


Invasive Plants by Category

  • Aquatic - 18 species, 1755 records
  • Cactus - 1 species, 26 records
  • Conifer Trees - 5 species, 19 records
  • Forbs/Herbs - 734 species, 23767 records
  • Grass or Grasslike - 221 species, 13684 records
  • Hardwood Trees - 112 species, 1859 records
  • Palms - 2 species, 100 records
  • Shrub or Subshrub - 121 species, 3544 records
  • Vines - 48 species, 1675 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. cheatgrass - 1946 reports
  2. bull thistle - 1285 reports
  3. giant reed - 640 reports
  4. Geraldton carnation weed - 549 reports
  5. common yarrow - 547 reports
  6. giant salvinia - 504 reports
  7. yellow starthistle - 495 reports
  8. hedgehog dogtailgrass - 492 reports
  9. purple pampasgrass - 468 reports
  10. Himalayan blackberry - 466 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 - 774 species
  2. Los Angeles County - 699 species
  3. Butte County - 644 species
  4. Santa Barbara County - 610 species
  5. Sonoma County - 583 species
  6. Marin County - 561 species
  7. Riverside County - 558 species
  8. San Bernardino County - 530 species
  9. Alameda County - 503 species
  10. San Luis Obispo County - 491 species

Counties with the least invasive species reported

  1. Kings County - 51 species
  2. Alpine County - 96 species
  3. Sierra County - 106 species
  4. Imperial County - 139 species
  5. San Benito County - 167 species
  6. Madera County - 190 species
  7. Mono County - 193 species
  8. Yuba County - 199 species
  9. Sutter County - 202 species
  10. Amador County - 204 species

Report created on September 1, 2014 at 07:35 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.