1	Calyx 10-15 mm, with subbasifixed, spreading, white hairs 1-1.5 mm and with shorter black hairs.		278 A. angustissimus
+	Calyx shorter, with appressed hairs		(2)
2 (1)	Plants with sterile shoots; leaves of sterile shoots 1-2 cm, with 1 or 2 pairs of small leaflets 2-3 mm; leaves of flowering shoots 3-7 cm, leaflets in (2 or)3 or 4 pairs, linear, 10-15 × 1-1.5 mm; petals probably yellow.		279 A. chaidamuensis
+	Plants without sterile shoots; leaves and leaflets all of equal size; petals pink, purple, or violet		(3)
3 (2)	Calyx 8-11 mm, teeth 2-4 mm; legumes linear, ca. 2 mm in diam.; racemes rather dense, short, up to 4 cm		(4)
+	Calyx shorter, at most up to 8 mm, teeth 1-1.5 mm; legumes 2.5-3.5 mm high; racemes distinctly longer, remotely flowered		(5)
4 (3)	Stipules 1.5-2.5 mm; leaflets in 3 or 4(or 5) pairs; standard below middle slightly constricted; wing limbs obtuse.		280 A. hesiensis
+	Stipules 4-5 mm; leaflets in 2 or 3 pairs; standard not constricted; wing limbs distinctly emarginate.		283 A. yumenensis
5 (3)	Wings (12-)14-15 mm, limbs distinctly incised to obliquely bilobed; keel 10-11 mm; legumes 6-10 mm, rather densely white and black hairy.		282 A. scoparius
+	Wings ca. 19 mm, limbs obtuse; keel ca. 16 mm; legumes 14-20 mm, glabrous or with scattered hairs only.		281 A. kessleri