Polygonum punctatum dotted smartweed Polygonaceae POPU; Bx, bz, pb, sf; Q, cu, j; R, ah, bm, w;

 

Polygonum punctatum.Fontenelle Nature Asssociation.www.fnaturesearch.org

Polygonum punctatum.Fontenelle Nature Asssociation.www.fnaturesearch.org. (Accessed 4/2014).

Polygonum punctatum is a perennial or annual herb, to 1 m tall; slender, habit very variable. 

Leaves alternate, lance-shaped to 20 long, 2 cm wide, sheaths (ocrea) bristle fringed. 

Flowers greenish-white, 5-parted, petals (tepals) with minute dots (use hand lens); inflorescence slender, to 10 cm long, interrupted, especially towards base, internodes to 3 cm). 

Fruit dry, achenes, lens-shaped or 3-sided; seeds eaten by some waterfowl and muskrats (Martin et al 1951). 

Wetland status: OBL. 

Frequency in NYC: Infrequent. 

Origin: Native. 

Habitat: Open, wet soil, swamps, swamp forest gaps; soil pH 6-8.7 Intolerant of shade, moderately tolerant of salt (USDA, NRCS 2010).