Polygonum glaucum

Polygonum glaucum, common names seabeach knotweed^[1] and seaside knotweed,^[2] is a North American species of plant in the buckwheat family. It grows on the Atlantic Coast of the United States, from Alabama to Massachusetts, including in salt-water inlets such as Chesapeake Bay and the Hudson River.^[3]

Polygonum glaucum
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Caryophyllales
Family:	Polygonaceae
Genus:	Polygonum
Species:	P. glaucum
Binomial name
Polygonum glaucum Nutt. 1818

Polygonum glaucum is a branching herb up to 70 cm (28 in) tall. It appears silvery of bluish-green because of wax covering the leaves and stem. Flowers are pink or white, produced in groups of 1–3. It grows on beaches, sand dunes, and the edges of coastal marshes.^[4]