Polygonum erectum is an erect annual growing tall with many to few, non-wiry branches. The leaves have distinct veins and entire edges or have jagged cut edges. The
pedicels are shorter or equal the length of the calyx and typically longer than the
ocreae. The closed flowers have a calyx that is typically long, green in color and 5-lobed. Flowers in clusters of 1 to 5 in
cymes that are produced in the axils of most leaves. The calyx segments are unequal with the outer lobes longer and not keeled and the inner ones narrowly keeled. The
tepals are greenish, with yellowish tinting or sometimes with whitish tints. The seeds are produced in
fruits called
achenes that can be of two different types; one type is dark brown with a shiny surface and is broadly egg-shaped, typically about long. The other achene type is dull brown, exsert and egg-shaped, and long. Late season fruiting is uncommon and if produced the achenes are long. File:Polygonum erectum BB-1913.png|Botanical illustration of
Polygonum erectum ==Conservation==