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Status of Invasive Plants in Pennsylvania

Total number of exotic species reported: 667

Total number of records in EDDMapS: 37768


Invasive Plants by Category

  • Aquatic - 19 species, 1347 records
  • Conifer Trees - 5 species, 94 records
  • Forbs/Herbs - 374 species, 18977 records
  • Grass or Grasslike - 92 species, 4609 records
  • Hardwood Trees - 56 species, 1659 records
  • Shrub or Subshrub - 76 species, 3411 records
  • Vines - 45 species, 2144 records

Top Ten Abundant Invasive Plants (by number of reports)

  1. Japanese stiltgrass - 741 reports
  2. spiny plumeless thistle - 733 reports
  3. multiflora rose - 607 reports
  4. musk thistle - 453 reports
  5. Japanese barberry - 424 reports
  6. garlic mustard - 332 reports
  7. Japanese honeysuckle - 294 reports
  8. watercress - 287 reports
  9. oriental bittersweet - 263 reports
  10. wine raspberry - 215 reports

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

  1. bush honeysuckles (exotic) - 67/67 (100%)
  2. common yarrow - 67/67 (100%)
  3. yellow toadflax - 67/67 (100%)
  4. common St. Johnswort - 67/67 (100%)
  5. common ragweed - 67/67 (100%)
  6. hedge bindweed - 67/67 (100%)
  7. lambsquarters - 67/67 (100%)
  8. Queen Anne's lace, wild carrot - 67/67 (100%)
  9. hairy galinsoga - 67/67 (100%)
  10. common velvetgrass - 67/67 (100%)

Counties with the most invasive species reported

  1. Philadelphia County - 594 species
  2. Bucks County - 523 species
  3. Montgomery County - 509 species
  4. Allegheny County - 507 species
  5. Northampton County - 486 species
  6. Berks County - 485 species
  7. Lehigh County - 481 species
  8. Delaware County - 450 species
  9. Chester County - 446 species
  10. Lancaster County - 424 species

Counties with the least invasive species reported

  1. Cameron County - 149 species
  2. Jefferson County - 161 species
  3. Clarion County - 162 species
  4. Montour County - 166 species
  5. Columbia County - 167 species
  6. Sullivan County - 169 species
  7. Indiana County - 180 species
  8. Union County - 184 species
  9. Forest County - 185 species
  10. Wyoming County - 190 species

Report created on August 21, 2014 at 12:24 AM by the UGA Center for Invasive Species and Ecosystem Health using EDDMapS Technology and Data.