59.1. Astragalus mollissimus Torr. var. bigelovii (A. Gray) Barneby, Mem. New York Bot. Gard. 13(2): 743. 1964

Type:— USA, Texas, On the Organ Mountains, northeast of El Paso; 30 April 30 1852, Wright 1358 (holotype (based on Astragalus bigelovii): GH00058668 digital image!; isotype: GH00263296 digital image!, BM001042756 digital image!, P00585122 digital image!) .

Astragalus bigelovii A. Gray, Smithsonian Contr. Knowl. 5(6): 42. 1853. — Tragacantha bigelovii Kuntze, Revis. Gen. Pl. 2: 943. 1891. — Astragalus bigelovii var. typicus Barneby, Leafl. West. Bot. 4: 60. 1944.

Pubescence of pod 1 mm long or longer, if shorter, the beak of the pod unilocular; pod narrow-oblong to lanceolateelliptic, beak bilocular.

Distribution:— Variety with restricted distribution in Mexico, registered in the extreme north of Sonora (Naco and Agua Prieta) and Chihuahua (Janos). Also, in New Mexico, Arizona and Texas (USA) (Fig. 18).

Habitat:— Soils with volcanic pebbles; limestone; shallow slopes between valleys, with grassland-scrub; grasslands; desert scrub; overgrazed grasslands; 1480–1500 m.

Specimens examined:— CHIHUAHUA: 20 March 1984, Rolling hills 0.4 miles east of Highway 2 at a point 5.2 road miles northwest of Arroyo Salto de Ojo and 14.3 miles northwest of Janos, A. C. Sanders 4731, W. Charlton, McIntosh, Vanway, Gibeaut, Gould (NY) ; 22 April 1891, St. Diego, C. V. Hartman 605 (JEPS) . SONORA: 4 May 2007, Dry represo (tank) in Arroyo La Bruja, Rancho La Morita, ca. 24 km west, 5.5 km south (by air) of Agua Prieta; Chihuahuan desertscrub/desert grassland, A. L. Reina G. 2007-581, T. R. Van Devender (MEXU, USON) ; 9 April 2003, 12.7 km southeast of Naco on road to Cananea at junction with MEX 2, T. R. Van Devender 2003-341, A. L. Reina, G. Anderson (MEXU, USON) ; 19 April 2007, Hill east of Arroyo La Bellota, Rancho La Morita, ca. 25 km west, 3 km south (by air) of Agua Prieta, T. R. Van Devender 2007-476, A. L. Reina, E. Enderson (MEXU, USON) .