Polygonum hydropiperoides false water-pepper Polygonaceae POHY2; Q, cu, f, j; R, is, ml, t, w, wp;

 

Polygonum hydropiperoides.Keir Morse.calphotos.berkeley.edu

Polygonum hydropiperoides.© Keir Morse.calphotos.berkeley.edu. (Accessed 4/2014).

Polygonum hydropiperoides is a perennial herb to 1 m; colonial by slender, tough, branching, creeping rhizomes; stems somewhat reclining; leaf sheath membranous, appressed brownish hairy, top fringed with long bristles. 

Leaves alternate, narrow. 

Flowers pink to white, radially symmetrical; 5 petals (tepals), basal bracts tubular, appressed bristly, usually not overlapping, in erect, slender terminal or axillary racemes 2-8 cm long, raceme stalks appressed bristly above; blooming and fruiting July-Nov. (Hough 1983). 

Fruit dry, achenes trigonous, smooth, shiny, rounded angles, concave sides, to 0.3 cm long, 0.2 cm cm wide. 

Wetland status: OBL. 

Frequency in NYC: Infrequent. 

Origin: Native. 

Habitat: Open wet soil, pond edges.