1	Leaf paripinnate, petiole spiny, fruit unilocular		(2)
+	Leaf imparipinnate, petiole not spiny, fruit bilocular		(4)
2 (1)	Free portion of the stipule c. 2-3 mm, acute, villous; calyx teeth (in flower, not at the fruiting stage) c. 3-3.5 mm		Astragalus anisacanthus
+	Free portion of the stipule more than 3 mm (c. 3.5-9 mm), subglabrous with hairs on the margin, acuminate		(3)
3 (2)	Calyx cup c. 5-6 mm long, teeth c. 6-7 mm long		Astragalus diopogon
+	Calyx cup c. 4-5 mm, teeth c. 3-4 mm long		Astragalus congestus
4 (1)	Leaflets broadly ovate to orbicular, calyx teeth c. 6-7 mm long, cup c. 1.3-1.4 cm long		Astragalus kahiricus
+	Leaflets elliptical, narrowly obovate, calyx teeth c. 10-11 mm long cup c. 6-7 mm, long. (Illustration)		Astragalus sericostachys