Family: Evening primrose (Onagraceae)
Size: 1.5 in.
Other names: Cutleaf Evening Primrose
Notes: In contrast to the stemless primrose, whose very short stems all radiate linearly outward from a central basal rosette, the stems of this smaller flower radiate outward along the ground from the plant center until they turn and rise toward the sky, to a much greater height (as much as 18 inches) than do the stemless primrose. 21 species of Oenothera in Arizona
Photos of this plant can be seen on the CalPhoto plants websites.