Polygonum glaucum seaside knotweed Polygonaceae POGL; Q, rb; K;

 

Polygonum glaucum.Arthur Haines.New England Wild Flower Society.gobotany.newenglandwild.org(2)

Polygonum glaucum.Arthur Haines.New England Wild Flower Society.gobotany.newenglandwild.org. (Accessed 4/2014).

Polygonum glaucum is an annual herb to 30 cm long, prostrate but branch tips upturned, very pale gray-green, leaf sheaths encircling nodes, dark reddish-brown, the margin whitish, bristle-fringed, 0.7-1.0 cm. 

Leaves alternate, lance-shaped 1-3 cm long, 0.2-0.8 cm wide. 

Flowers pale pink-white, tepals with green midrib, 0.2-0.4 cm, in small axillary clusters; blooming and fruiting July-Oct. (Hough 1983

Fruit dry, an achene, shiny, blackish, to 0.4 cm long, 0.2 cm wide. 

Wetland status: FACU. 

Frequency in NYC: Rare (Global status G3, very rare; NYS S3 rare). 

Origin: native. 

Habitat: Sand of back dune areas.