51.1. Astragalus lentiginosus Douglas var. australis Barneby, Leafl. West. Bot. 4: 117. tab III, fig. 15–19. 1945

Type:— USA, Arizona, Pima County, along roadside near Robles, west side of the Baboquivari Mountains, A. Nelson & R. Nelson 1537 (holotype: NY 00005501!; isotype: UC, not found), Main characters as in the key.

Distribution:— Northwestern end of Chihuahua (Janos), rare. Sandy soils along roads; desert scrub with Larrea and Yucca. Also, in Arizona and New Mexico (USA) (Fig. 15).

Specimens examined:— CHIHUAHUA: 4 March 1997, 43 mi. SW of Palomas at minera Bismark turnoff, N. D. Atwood, 21591, J. Spencer (NY).