Astragalus humistratus A. Gray var. sonorae (A. Gray) M. E. Jones

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

44.2. Astragalus humistratus A. Gray var. sonorae (A. Gray) M. E. Jones , Contr. W. Bot. 10: 58. 1902

Type:— MEXICO, Sonora, Mountain valleys, between the San Pedro and the Sonoita , September 1851, Wright 1005 (holotype: GH 00263299 digital image!; isotype MO 149241 digital image!, GH 00245337 digital image!) .

Prostrate, annual with single stems (A. L. Reyna 2009-56 et al. ( USON)), and with purple and white flowers.

Distribution:— This variety has a larger distribution, along the northern border of Sonora, from Sonoita, through Santa Cruz, Cananea, Nogales to Agua Prieta and isolated in central-western Chihuahua (Guerrero). Also found in Arizona and New Mexico ( USA) ( Fig. 12 ).

Habitat:— Intermountain valleys; igneous and alluvial soils; steep slopes with grassland; floodplains with grassland; oak-pine forest; 1613–2250 m.

Specimens examined:—CHIHUAHUA: 18 August 1998, 2 km S of Santo Tomas in the Barrio San Ignacio , ca. ½ km S of Rio Papigochic, R. Spellenberg 12692, L. Brouillet, T. K. Todsen ( NY) . SONORA: 1851, Between the San Pedro and Sonoita rivers, C. Wright 1005 (fototype, CAS) ; 19 May 2010, Just south of New Mexico border, W side Animas, Valley, 54.2 km (by air) E of Agua Prieta, Cuenca Los Ojos Foundation property, T. R. Van Devender 2010-555, A. L. Reina G. ( USON) ; 26 April 2009, Animas Valley , ca 57.9 km E of Agua Prietaa, Cuenca Los Ojos Conservation Area, A. L. Reina G. 2009-56, T. R. Van Devender, B. T. Wilder, J. L 20-V1987, Anderson ( USON) ; 17 July 2001, 7.8 km NW of Santa Cruz on road to Nogales, A. L. Reina G. 2001-544, T. R. Van Devender ( USON) ; 16 August 2001, 3 km north of Santa Cruz on road to Nogales, T. Van Devender 2001-707, A. L. Reina, J. Sánchez E. O. Gutiérrez, E. Gómez L. ( MEXU 20 May 1987, 10 km al S de Cananea, Carretera a Arizpe, P. Tenorio L. 13559, C. Romero de T. ( MEXU).

Figures

FIGURE 12. Map showing the distribution of Astragalus hintonii var. hintonii, A. hintonii var. cofrensis, A. hornii var. minutiflorus, A. humistratus var. humistratus, and A. humistratus var. sonorae in Mexico.