Polygonum aviculare ssp. depressum — mat-forming 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 — Norfolk — Milton [ 1884 ]
  2. MA — Essex — Haverhill [ 1932 ]
  3. MA — Essex — Gloucester [ 0 ]
  4. MA — Middlesex — Bedford [ 0 ]
  5. MA — Middlesex — Cambridge [ 1916 1975 1909 ]
  6. MA — Middlesex — Lincoln [ 1955 0 ]
  7. MA — Middlesex — Malden [ 0 ]
  8. MA — Middlesex — Wakefield [ 1931 ]
  9. MA — Suffolk — Boston [ 1906 1906 1895 ]
  10. MA — Suffolk — Revere [ 1882 ]
  11. MA — Norfolk — Bellingham [ 1935 ]
  12. MA — Norfolk — Cohasset [ 1882 ]
  13. MA — Norfolk — Needham [ 1883 ]
  14. MA — Plymouth — Hull [ 1901 ]
  15. MA — Barnstable — Eastham [ 1907 1913 ]
  16. MA — Barnstable — Bourne [ 1914 ]
  17. MA — Barnstable — Harwich [ 1918 ]
  18. MA — Barnstable — Dennis [ 1919 ]
  19. MA — Nantucket — Nantucket [ 1907 1906 ]
  20. MA — Worcester — Barre [ 1948 ]
  21. MA — Hampden — Springfield [ 1915 ]
  22. MA — Berkshire — Stockbridge [ 1902 ]
  23. MA — Berkshire — Lenox [ 1911 ]
  24. MA — Hampshire — Northampton [ 1978 ]
Historic and Recent
  1. MA — Worcester — Worcester [ 1931 1996 ] Verified: [ ? ? ]
  2. MA — Franklin — Deerfield [ 1986 1972 1956 1986 ] Verified: [ ? ? ? ? ]
Only Recent
  1. MA — Worcester — Hubbardston [ 2008 ] Verified: [ ? ]
  2. MA — Berkshire — Great Barrington [ 1990 ] Verified: [ ? ]
  3. MA — Berkshire — Lee [ 1989 ] Verified: [ ? ]
  4. MA — Franklin — Heath [ 2012 ] Verified: [ ? ]
  5. MA — Franklin — Ashfield [ 2011 ] Verified: [ ? ]
  6. MA — Franklin — Sunderland [ 1984 ] Verified: [ ? ]
  7. MA — Worcester — West Brookfield [ 2006 ] Verified: [ ? ]
  8. MA — Middlesex — Reading [ 2003 ] Verified: [ ? ]
  9. MA — Franklin — Charlemont [ 2012 ] Verified: [ ? ]
  10. MA — Franklin — Buckland [ 2012 ] Verified: [ ? ]
  11. MA — Plymouth [ 2011 2011 2011 2011 2011 2011 2011 2014 2015 2015 2016 ] Verified: [ ? ? ? ? ? ? ? ? ? ? ? ]
  12. MA — Randolph [ 2023 2023 2023 2023 2023 ] Verified: [ ? ? ? ? ? ]
Unable to Map
(town name missing or non-standard or locality outside New England)
Generated Aug. 23, 2024, 3:59 p.m. (America/New_York)