Astragalus brauntonii, Parish, 1903

Castillón, Eduardo Estrada, Rebman, Jon P., González, Carlos & Quintanilla, José Ángel Villarreal, 2022, Astragalus tijuanensis and Astragalus brauntonii var. lativexillum, a new species and a new variety in the genus Astragalus (Fabaceae) from extreme northwestern Baja California, Mexico, Phytotaxa 577 (1), pp. 1-13 : 8

Dichotomous key to identify the varieties of Astragalus brauntonii

1. Peduncles 2.4 cm long or shorter; flowers 30 or less per raceme; banner 6.9–7.5 mm wide; wings 3 mm wide; Tijuana, Mexico... .............................................................................................................................................................. A. brauntonii var. lativexillum

– Peduncles 2.5–9 cm long; flowers 35–60 per raceme; banner 4.5–5.5 mm wide; wings 2–2.3 mm wide; Los Angeles and surrounding areas, USA.............................................................................................................................................. A. brauntonii var. brauntonii