Status of Invasive Plants in California

Total number of exotic species reported: 1185

Total number of records in EDDMapS: 52246


Invasive Plants by Category

  • Aquatic - 18 species, 1734 records
  • Cactus - 1 species, 26 records
  • Conifer Trees - 5 species, 19 records
  • Forbs/Herbs - 665 species, 21763 records
  • Grass or Grasslike - 201 species, 12614 records
  • Hardwood Trees - 104 species, 1767 records
  • Palms - 1 species, 79 records
  • Shrub or Subshrub - 115 species, 3142 records
  • Vines - 48 species, 1654 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. cheatgrass - 1414 reports
  2. giant reed - 604 reports
  3. Geraldton carnation weed - 549 reports
  4. common yarrow - 547 reports
  5. giant salvinia - 504 reports
  6. hedgehog dogtailgrass - 492 reports
  7. purple pampasgrass - 468 reports
  8. Himalaya blackberry - 454 reports
  9. spreading hedgeparsley - 443 reports
  10. ripgut brome - 438 reports

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

  1. yellow starthistle - 57/58 (98%)
  2. white willow - 57/58 (98%)
  3. common yarrow - 56/58 (97%)
  4. red brome - 56/58 (97%)
  5. rattail fescue - 56/58 (97%)
  6. redstem filaree - 55/58 (95%)
  7. prickly lettuce - 55/58 (95%)
  8. perennial pepperweed - 55/58 (95%)
  9. common chickweed - 54/58 (93%)
  10. Russian knapweed - 54/58 (93%)

Counties with the most invasive species reported

  1. San Diego County - 780 species
  2. Los Angeles County - 703 species
  3. Butte County - 647 species
  4. Santa Barbara County - 621 species
  5. Sonoma County - 582 species
  6. Marin County - 565 species
  7. Riverside County - 558 species
  8. San Bernardino County - 532 species
  9. Alameda County - 505 species
  10. San Luis Obispo County - 495 species

Counties with the least invasive species reported

  1. Kings County - 51 species
  2. Alpine County - 95 species
  3. Sierra County - 106 species
  4. Imperial County - 141 species
  5. San Benito County - 167 species
  6. Madera County - 179 species
  7. Mono County - 193 species
  8. Yuba County - 199 species
  9. Sutter County - 204 species
  10. Amador County - 204 species

Report created on April 18, 2014 at 02:13 PM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.



Bugwood Center Developed by The University of Georgia - Center for Invasive Species and Ecosystem Health.
Last updated on Tuesday, December 04, 2012 at 08:59 AM