Polygonum articulatum L.
Common Name: JOINTWEED
Synonym: Polygonella articulata
Coefficient of Conservatism: 8
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Nt A-Forb

Polygonum articulatum A. A. Reznicek

Sandy banks, plains, and dunes, often in somewhat disturbed places such as dry roadsides. Common on the jack pine plains and also from Whitefish Point to the Huron Mountains along Lake Superior, where plants are relatively large and showy when blooming late in the summer. Very local in southernmost Michigan.

The perianth varies from white to red. Until the plants bloom (chiefly August–September), the peculiar segmented appearance of the immature inflorescences, with closely overlapping ocreolae but no buds yet evident, often arouses curiosity in those not familiar with the species.

Schuster, Reveal, & Kron (2011) show that this species is nested within the group of Polygonum containing other slender annual species such as P. douglasii and P. tenue.


Alger County
Allegan County
Arenac County
Barry County
Bay County
Benzie County
Berrien County
Cass County
Cheboygan County
Chippewa County
Crawford County
Delta County
Emmet County
Grand Traverse County
Houghton County
Huron County
Iosco County
Kalkaska County
Kent County
Keweenaw County
Lake County
Lapeer County
Leelanau County
Luce County
Mackinac County
    Only on Bois Blanc, Mackinac, Round Islands
Manistee County
Marquette County
Mason County
Mecosta County
Menominee County
Missaukee County
Montmorency County
Muskegon County
Newaygo County
Oceana County
Ogemaw County
Oscoda County
Otsego County
Ottawa County
Presque Isle County
Roscommon County
Schoolcraft County
St. Clair County
Washtenaw County
Wexford County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. June 29, 2022. https://michiganflora.net/species.aspx?id=2293.