Polygonum 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 — Norfolk — Brookline [ 1900 ]
  2. MA — Middlesex — Cambridge [ 1895 1895 1895 1895 1895 1916 1976 1878 1976 1976 1976 1976 None 0 1909 1894 1909 1884 1976 1916 1976 ]
  3. MA — Suffolk — Boston [ 0 1879 1901 1897 1901 1975 1975 ]
  4. MA — Suffolk — Revere [ 1905 1894 1886 1901 1901 1905 ]
  5. MA — Middlesex — Lowell [ 1882 ]
  6. MA — Barnstable — Barnstable [ 1916 ]
  7. MA — Worcester — Oakham [ 1938 ]
  8. MA — Essex — Gloucester [ 1897 1897 ]
  9. MA — Barnstable — Truro [ None ]
  10. MA — Nantucket — Nantucket [ 1899 1899 1901 1911 1911 1912 ]
  11. MA — Essex — Danvers [ 1923 ]
  12. MA — Hampshire — Worthington [ 1912 ]
  13. MA — Essex — Newburyport [ 0 1902 ]
  14. MA — Essex — Beverly [ 1941 ]
  15. MA — Barnstable — Brewster [ 1918 ]
  16. MA — Hampden — Granville [ 1913 1913 1913 ]
  17. MA — Dukes — Oak Bluffs [ 1916 ]
  18. MA — Hampshire — Northampton [ 1978 1978 ]
  19. MA — Suffolk — Cambridge [ 1881 ]
  20. MA — Middlesex — Sherborn [ 1913 1911 1911 1911 1918 1912 ]
  21. MA — Barnstable — Eastham [ 1913 ]
  22. MA — Dukes — Tisbury [ 1911 ]
  23. MA — Barnstable — Wellfleet [ 1915 1973 ]
  24. MA — Hampshire — Amherst [ 1926 1911 1891 1952 1868 1876 ]
  25. MA — Essex — Ipswich [ 1964 ]
  26. MA — Hampshire — Belchertown [ 1871 ]
  27. MA — Worcester — Leicester [ 1966 ]
  28. MA — Bristol — Swansea [ 1909 1909 ]
  29. MA — Plymouth — Plymouth [ 1975 ]
  30. MA — Essex — Groveland [ 1911 ]
  31. MA — Norfolk — Walpole [ 1967 ]
  32. MA — Essex — Haverhill [ 1911 ]
Historic and Recent
  1. MA — Berkshire — Williamstown [ 1916 1990 ] Verified: [ ? ? ]
  2. MA — Worcester — Fitchburg [ 1955 2005 ] Verified: [ ? ? ]
  3. MA — Worcester — Worcester [ 1976 1941 1996 ] Verified: [ ? ? ? ]
  4. MA — Hampden — Springfield [ 1845 2002 2004 2001 2001 2003 2002 2001 ] Verified: [ ? ? ? ? ? ? ? ? ]
  5. MA — Worcester — Petersham [ 2007 2007 2004 1929 1893 ] Verified: [ ? ? ? ? ? ]
  6. MA — Barnstable — Bourne [ 1912 1992 ] Verified: [ ? ? ]
Only Recent
  1. MA — Berkshire — Lee [ 1989 ] Verified: [ ? ]
  2. MA — Franklin — Deerfield [ 1986 ] Verified: [ ? ]
  3. MA — Hampden — Chicopee [ 1988 1994 ] Verified: [ ? ? ]
  4. MA — Hampden — Westfield [ 1990 1987 ] Verified: [ ? ? ]
  5. MA — Hampshire — Westhampton [ 1992 ] Verified: [ ? ]
  6. MA — Middlesex — Ayer [ 1991 ] Verified: [ ? ]
  7. MA — Hampshire — Hadley [ 2002 ] Verified: [ ? ]
  8. MA — Essex — Lynnfield [ 2004 ] 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)