Velvetweed
Oenothera curtiflora (Gaura parviflora)

Family: Evening Primrose (Onagreaceae)
AKA: Tall Gaura, Lizard Tail
Photo taken on: July 20, 2009
Location: Wet Mountains, Eastern CO
Life Zones: Plains to foothills
Habitat: Dry areas, roadsides

Grows to 6ft tall with a velvety stem and leaves. It has tiny pink flowers with reddish stalks in a nodding flowerhead.

Flora of North America reference.