Amaranthus retroflexus

Redroot Pigweed
Amaranthus retroflexus

Family: Amaranth (Amaranthaceae)
AKA: Green Amaranth, Rough Pigweed, Redroot Amaranth
Photo taken on: August 29, 2008
Location: Wet Mountains, Eastern CO
Life Zones: Plains to montane
Habitat: Waste ground, roadsides

Grows to 4ft with a stout, smooth, reddish stem. Tiny flowers with spiny bracts grow in spikes. It is a weed producing over 100,000 seeds per plant.

Flora of North America reference.

Green & Brown Flowers