Winged Buckwheat
Eriogonum alatum (Pterogonum alatum)

Family: Buckwheat(Polygonaceae)
AKA: Tall Yellow Eriogonum
Photo taken on: June 28, 2008
Location: Wet Mountains, Eastern CO
Life Zones: Foothills to montane
Habitat: Dry meadows and slopes

Grows 3-5ft tall in a very airy pattern from a basal rosette. Tiny flowers are greenish-yellow in small clusters. Seeds have wings.

Flora of North America reference.