[Evening-primroses, Sun Cups and Yellow Cups: The Genus Camissonia (and Chylismia and Eremothera) in the Southwestern Deserts of the United States]

Yellow cups (ssp. arizonica) as seen about one mile south of Boundary Rock along old US Highway 66............February 22, 2013. Note the reflexed flower buds of this subspecies.

Yellow cups (ssp. arizonica?) as seen south of Katherine Landing at Lake Mead National Recreation Area............February 27, 2013.