44.1. Astragalus humistratus A. Gray var. humistratus

Type:— USA, New Mexico, Pebbly bed of a stream and on hills under pine-trees, near tiie copper mines. Aug 1851, Wright 1003 (holotype: GH 00058773 digital image!; isotype: NY00005462!, MO-022529 digital image!, P00585374 digital image!, K000999282 digital image!, US00004159 digital image!) .

Astragalus humistratus A. Gray, Pl. Wright. 2: 43: 1853.— Tragacantha humistrata Kuntze, Revis. Gen. Pl. 2: 945. 1891.— Batidophaca humistrata Rydb., N. Amer. Fl. 24(6): 315. 1929.— Tium humistratum Rydb., Bull. Torrey Bot. Club 32: 660. 1906.— Ctenophyllum humistratum (A. Gray) Rydb. ex A.Heller, Cat. N. Amer. Pl. (ed. 3) 214. 1914.

Astragalus datilensis (Rydb.) Tidestr., Proc. Biol. Soc. Washington 50: 21. 1937.

Distribution:— Rare in Mexico, intermountain valleys of western Chihuahua (Gómez Farías, Laguna de Babícora and Guerrero). Also, in Arizona, New Mexico, Colorado, and Texas (USA) (Fig. 12).

Habitat:— Grasslands in floodplains; canyons and steep ravines; 2150–2200 m.

Specimens examined:— CHIHUAHUA: 10 September 1994, Laguna de Babícora, G. Quintana, E. Estrada 3551 (ANSM, NY) .