Bushy Knotweed
Polygonum ramosissimum

Family: Buckwheat (Polygonaceae)
AKA:
Photo taken on: July 19, 2008
Location: Almont Triangle, GV, CO
Life Zones: Plains to foothills
Habitat: Packed soil, paths and roads

Plant is yellowish to bluish-green , creeping and weedy. It forms mats with some erect stems. Tiny flowers grow from the leaf axils.

Flora of North America reference.