Plains Blackfoot
Melampodium leucanthum

Family: Sunflower (Asteraceae)
AKA: Blackfoot Daisy, White Paperflower
Photo taken on: May 30, 2016
Location: Wet Mountains, Eastern CO
Life Zones: Plains and foothills
Habitat: Sandy, rocky, gravelly areas

Stems grow to 18" with a woody base and narrow leaves. Flowers are 1" wide with broad, nothched white petals that have purple veins underneath. The yellow disk flowers turn black at the base as they age.

Flora of North America reference.