threecorner milkvetch, Astragalus geyeri var. triquetrus, North Muddy Mountains, Logan Wash, Moapa Valley - Colorado River drainage, elevation 525 m (1715 ft).
This rare species, distinguished by its 3-angled fruits, is limited to loose calcareous sands of southeastern Nevada and adjacent northwestern Arizona. It is on the State of Nevada list of fully protected species.
Uploaded from my Flickr site: https://www.flickr.com/photos/127605180@N04/