Snow on the Mountain
Euphorbia marginata (Agaloma marginata)

Family: Spurge (Euphorbiaceae)
AKA: Ghost Weed, White-margined Spurge
Photo taken on: July 28, 2008
Location: Wet Mountains, Eastern CO
Life Zones: Plains
Habitat: Dry slopes and fields

Grows to 3ft. Flowers are small but the white edged leaves are striking and distinctive.

Flora of North America reference.