Polygonum aviculare ssp. aviculare — common knotweed — distribution by town in Massachusetts

Legend
— town in which taxon has been recorded only recently (in or after 1980)
— both recent and historic records
— only historic records (dated prior to 1980)
— doubtful or erroneous record
Sources
Records retrieved from CNH Portal, NHESP town records for rare plants, generic records (e.g., observations listed in the county floras), and salicicola photo records. Click on any town marker to see source(s) of pertaining record(s) coded as [CNH], [generic], [photo], or [NHESP]. In the list below, exclamation sign ('!') appended to years for verified records, and question mark ('?') for unverified.
Records Sorted by Category
Only Historic
  1. MA — Barnstable — Truro [ 1932 ]
  2. MA — Essex — Andover [ 0 ]
  3. MA — Essex — Haverhill [ 1932 ]
  4. MA — Essex — North Andover [ 0 ]
  5. MA — Middlesex — Billerica [ 1907 ]
  6. MA — Middlesex — Concord [ 1857 1957 ]
  7. MA — Middlesex — Malden [ 0 1880 1947 ]
  8. MA — Middlesex — Medford [ 1887 ]
  9. MA — Medford [ 1887 ]
  10. MA — Suffolk — Revere [ 1882 1882 1882 ]
  11. MA — Norfolk — Milton [ 1928 ]
  12. MA — Norfolk — Wellesley [ 1910 ]
  13. MA — Bristol — New Bedford [ 1904 ]
  14. MA — Bristol — Fall River [ 1911 ]
  15. MA — Bristol — Dartmouth [ 1903 ]
  16. MA — Bristol — Swansea [ 1909 ]
  17. MA — Barnstable — Falmouth [ 1906 ]
  18. MA — Barnstable — Harwich [ 1914 ]
  19. MA — Barnstable — Provincetown [ 1919 1919 ]
  20. MA — Barnstable — Dennis [ 1919 ]
  21. MA — Barnstable — Eastham [ 1907 ]
  22. MA — Barnstable — Brewster [ 1912 1912 ]
  23. MA — Barnstable — Bourne [ 1914 ]
  24. MA — Barnstable — Wellfleet [ 1916 ]
  25. MA — Nantucket — Nantucket [ 1910 1907 1912 1911 ]
  26. MA — Worcester — Brookfield [ 1948 ]
  27. MA — Worcester — Harvard [ 1952 ]
  28. MA — Worcester — Templeton [ 1950 ]
  29. MA — Berkshire — Mount Washington [ 1915 ]
  30. MA — Berkshire — New Marlborough [ 1912 ]
Historic and Recent
  1. MA — Suffolk — Boston [ 1916 1989 1916 1919 ] Verified: [ ? ? ? ? ]
  2. MA — Plymouth — Marshfield [ 1898 1898 1982 ] Verified: [ ? ? ? ]
Only Recent
  1. MA — Middlesex — Cambridge [ 2006 ] Verified: [ ? ]
  2. MA — Franklin — Shelburne [ 2012 ] Verified: [ ? ]
  3. MA — Franklin — Charlemont [ 2016 ] Verified: [ ? ]
  4. MA — Plymouth [ 2017 ] Verified: [ ? ]
Unable to Map
(town name missing or non-standard or locality outside New England)
Generated May 12, 2024, 1:32 p.m. (America/New_York)