Astragalus hintonii Barneby var. cofrensis 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

42.1. Astragalus hintonii Barneby var. cofrensis Barneby, Mem. New York Bot. Gard. 13: 158. 1964

Type:— MEXICO, Veracruz, Cofre de Perote above Los Pescados , 10,200 feet, 15 May 1938, E. K. Balls & W. B. Gourlay B-4624 (holotype NY 00005803 !; isotype: US00004121 digital image!, Main differences as in key. Stems short, 8–24 cm long; stipules bidentate all, with similar size; peduncles up to 1.5 cm long; bracts 1–2.5 mm long; the calyx with white trichomes; the banner 14–15.6 mm long.

Distribution:— Endemic to southern Mexico. Exclusive to the mountains of Veracruz (Cofre de Perote volcano), rare ( Fig. 12 ).

Habitat:— Clayey, brown soils and volcanic rocks; conifer forest; 3100–4200 m.

Comments:— In this region, A. micranthus var. seatonii is also found; both species have stipitate pods, but they can be separated by the petal size and pod shape, A. micranthus has much smaller flowers (calyx 2.5–3.1 mm long, banner 4.5–5.2 mm, wings 4.4–4.8 mm, keel 3.9–4.6 mm) and triquetrous pod.

Specimens examined:— VERACRUZ: 3 June 1976, Cofre de Perote , M. G. Zolá et al. 48, z-4 8 ( ENCB, MEXU, NY) ; 25 May 1938, Above Los Pescados, Cofre de Perote , E. K. Ballls 4624, W. B. Gourlay ( NY) 8 June 1989, Vereda de Cruz Blanca a Rinconada, C. Durán 826, J. Becerra ( MEXU) ; 25 June 1986, Entre Tenextepec y Los Altos, Mpio. Perote, M. Cházaro 3742 ( IEB) .

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.