Astragalus mollissimus Torr. var. bigelovii (A. Gray) Barneby,

Castillón, Eduardo Estrada, Quintanilla, José Ángel Villarreal, Delgado-Salinas, Alfonso & Rebman, Jon P., 2023, The genus Astragalus (Leguminosae: Papilionoideae: Galegeae) in Mexico, Phytotaxa 586 (1), pp. 1921-1935 : 1921-1935

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) .

Figures

FIGURE 18. Map showing the distribution of Astragalus mollissimus var. bigelovii, A. mollissimus var. earleri, A. mollissimus var. irolanus, A. moranii, and A. nothoxys in Mexico.