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