Oenothera primiveris A.Gray
A common spring-flowering plant in rocky areas, or in the flats in wet years. The plants I've seen are rather variable in vegetative morphology, but near as I can tell are all Oenothera primiveris.
Plant habit, Cedar Hills, 18 Feb 2007.
A flower, Cedar Hills, 18 Feb 2007.
Oenothera primiveris on the flats on the west side of the Mohawk Dunes, east of Yuma, AZ, 27 Feb 2005.
Oenothera primiveris on the flats on the west side of the Mohawk Dunes, east of Yuma, AZ, 27 Feb 2005.
A flower at Tortugas Mountain, Doña Ana County, New Mexico, 13 Mar 2010.
Plant habit at at Tortugas Mountain, Doña Ana County, New Mexico, 13 Mar 2010.
A flower at Tortugas Mountain, Doña Ana County, New Mexico, 13 Mar 2010.
Leaves at Tortugas Mountain, Doña Ana County, New Mexico, 13 Mar 2010.