Nodding Ragwort
Senecio bigelovii var. hallii (Ligularia bigelovii)

Family: Sunflower (Asteraceae)
AKA: Rayless Senecio, Bigelow Groundsel, Hall's Ragwort
Photo taken on: August 8, 2004
Location: Lily Lake. GV, CO
Life Zones: Montane to subalpine
Habitat: Moist meadows, ditches

Grows to 3ft tall. Flower heads are nodding and have only disk flowers. The bracts can be maroon, yellow or greenish.

Flora of North America reference.