1	Leaves 3-foliolate; leaflet blades of mature leaves 1.7-4.5 cm.		64 O. diversifolia
+	Leaves 5-35-foliolate; leaflet blades 0.2-1(-1.4) cm		(2)
2 (1)	Racemes many flowered (usually 10 or more)		(3)
+	Racemes (1 or)2-8(-10)-flowered		(5)
3 (2)	Corolla yellow, standard ca. 13 mm.		65 O. maduoensis
+	Corolla purple, standard 6-8 mm		(4)
4 (3)	Plants acaulescent or essentially so; peduncle shorter than leaves; stipules 7-9 mm; beak of corolla keel ca. 0.3 mm.		66 O. linearibracteata
+	Plants caulescent, with 2 or more internodes apparent; peduncle equaling or shorter than leaves; stipules 4-5 mm; beak of corolla keel ca. 2 mm.		67 O. lanceatifoliola
5 (2)	Corolla standard 0.5-0.9 cm; calyx 3.4-7 mm; racemes 2-5-flowered		(6)
+	Corolla standard 0.9-2.6 cm; calyx (5-)6-15 mm; racemes (1 or)2-10-flowered		(10)
6 (5)	Corolla white; racemes 2- or 3-flowered; calyx 6-7 mm; herbage green or greenish, not gray.		82 O. biflora
+	Corolla purple; racemes 2-5-flowered; calyx 3.4-6 mm; herbage with gray trichomes		(7)
7 (6)	Plants 1-2 cm tall; peduncle less than 1 cm, shorter than leaves.		80 O. brevipedunculata
+	Plants 2-10 cm tall; peduncle 2-7 cm, subequal to leaves or slightly surpassing them		(8)
8 (7)	Leaves 7-13-foliolate; leaflet blades lanceolate to linear-lanceolate, 4.5-10 × 0.5-2 mm; lamina of corolla standard oblong.		79 O. pusilla
+	Leaves 11-21-foliolate; leaflet blades ovate or oblong, 3-5 × 1-2 mm; lamina of corolla standard transversely broadly ovate or ovate		(9)
9 (8)	Calyx ca. 3.4 mm; corolla wings ca. 6.2 mm, keel ca. 5 mm; plants of Xinjiang.		84 O. yanchiensis
+	Calyx 5-6 mm; corolla wings ca. 8 mm, keel ca. 7 mm; plants of Xizang.		85 O. cinerascens
10 (5)	Corolla yellow or pale yellow		(11)
+	Corolla purple, blue, purplish blue, or light purple		(12)
11 (10)	Racemes rather lax; calyx 1.2-1.3 cm; corolla pale yellow, standard rounded at apex, wings truncate to rounded apically; leaflets glabrous.		68 O. ciliata
+	Racemes subcompact; calyx 0.8-1 cm; corolla yellow, standard emarginate at apex, wings rounded apically; leaflets with trichomes.		77 O. pseudohirsuta
12 (10)	Corolla standard 0.9-1.3 cm, wings 1-1.2 cm		(13)
+	Corolla standard (1-)1.5-2.6(-3) cm, wings (1.2-)1.3-2.1(-2.5)		(14)
13 (12)	Plants 2-8 cm tall; bracts 5-6 mm; calyx lobes 1.5-1.7 mm; apex of corolla standard emarginate; legume body 1-1.5 cm.		78 O. platysema
+	Plants 7-15 cm tall; bracts 2-4 mm; calyx lobes 2-4 mm; apex of corolla standard 2-lobed; legume body 1.4-3.7 cm.		81 O. yunnanensis
14 (12)	Corolla standard 1-1.5(-2.1) cm; keel beak (1-)1.5-1.6 mm; legume 3-4 mm wide.		83 O. pauciflora
+	Corolla standard (1.5-)1.7-2.6(-3) cm; keel beak 1-3 mm; legume 6-16 mm wide (unknown for O. wutaiensis)		(15)
15 (14)	Beak of corolla keel 1.5-3 mm; calyx (1-)1.2-1.6 cm		(16)
+	Beak of corolla keel 1-1.5(-1.8) mm; calyx 0.8-1.2(-1.3) cm (to 1.5 cm for O. inschanica)		(18)
16 (15)	Bracts 10-14 mm.		75 O. assiensis
+	Bracts 3-10 mm		(17)
17 (16)	Stipules membranous; leaflet blades broadly elliptic-oblong, oblong, or oblong-linear, 3-7 × 1.5-3 mm, plane; bracts 3-6 mm.		69 O. poncinsii
+	Stipules scarious; leaflet blades ovate to lanceolate, 5-10 × 2-4 mm, folded; bracts 6-10 mm.		70 O. eriocarpa
18 (15)	Leaflet blades apparently linear (involute)		(19)
+	Leaflet blades ovate, oblong-lanceolate, lanceolate, or narrowly lanceolate, plane or only marginally involute		(20)
19 (18)	Leaves 5-9-foliolate; corolla standard 2-3 cm, lamina subelliptic.		71 O. inschanica
+	Leaves 9-13-foliolate; corolla standard 1.8-2.3 cm, lamina suborbicular.		72 O. leptophylla
20 (18)	Leaves 13-21-foliolate; leaflet blades lanceolate to narrowly lanceolate; racemes (2 or)3-5-flowered.		76 O. moellendorffii
+	Leaves 17-35-foliolate; leaflet blades ovate or oblong-lanceolate; racemes 2-8-flowered		(21)
21 (20)	Corolla wings rounded at apex; racemes compact, 2-4-flowered; stipules ca. 3 mm.		73 O. wutaiensis
+	Corolla wings 2-lobed at apex; racemes rather lax, 2-8-flowered; stipules 5-13 mm.		74 O. anertii