1	Leaves digitate, 4-foliolate		(2)
+	Leaves all pinnate or only pinnate on long branchlets and digitate on short branchlets, 4-20-foliolate		(25)
2 (1)	Leaves on short branchlets subsessile; calyx tube 4-7 mm; claw of corolla wings shorter than limb		(3)
+	Leaves on short branchlets petiolate (but petiole as short as 1 mm in some species and absent in C. brachypoda); calyx tube 6-13 mm; claw of corolla wings as long as or shorter than limb		(9)
3 (2)	Branches yellowish white, yellow, or golden yellow		(4)
+	Branches whitish green, grayish green, yellowish green, dark gray, greenish brown, yellowish brown, brown, or dark brown		(5)
4 (3)	Ovary glabrous; legume 3-3.5 cm, glabrous; plants to 150 cm tall.		43 C. leucophloea
+	Ovary densely pubescent; legume 2-3 cm, pubescent when young but glabrescent; plants to 50 cm tall.		44 C. pygmaea
5 (3)	Leaflet blades narrowly obovate to oblanceolate, 2-3 mm wide; auricle of corolla wings 1/5-1/4 as long as claw.		45 C. altaica
+	Leaflet blades lanceolate, lanceolate-linear, or linear, 0.5-2 mm wide; auricle of corolla wings longer		(6)
6 (5)	Leaflet blades falcate; legume 2.5-4 cm.		46 C. aurantiaca
+	Leaflet blades straight; legume 2-2.5 cm		(7)
7 (6)	Leaflet blades dark green but abaxially tinged ± reddish; auricle of corolla wings ca. 2/3 as long as claw.		47 C. pumila
+	Leaflet blades green to grayish green; auricle of corolla wings 1/4-1/2 as long as claw		(8)
8 (7)	Corolla 1.1-1.2 cm; pedicel ca. 5 mm, articulate basally; stipule spines 1-4 mm on long branchlets.		48 C. versicolor
+	Corolla 0.8-1.8(-2) cm; pedicel 5-10 mm, articulate slightly basally from middle; stipule spines 4-7 mm on long branchlets.		49 C. stenophylla
9 (2)	Calyx tube saccate or gibbous		(10)
+	Calyx tube not or only slightly enlarged (but gibbous in C. camilloi-schneideri)		(14)
10 (9)	Corolla 2.7-3.2 cm; calyx tube 1.2-1.3 cm.		50 C. kirghisorum
+	Corolla 2-2.5(-2.8) cm; calyx tube 0.6-1.1 cm		(11)
11 (10)	Leaflet blade apices acute		(12)
+	Leaflet blade apices rounded, truncate, or emarginate		(13)
12 (11)	Pedicel 2-5 mm, articulate basally; leaflet blades oblanceolate.		51 C. brachypoda
+	Pedicel 5-12 mm, articulate apically; leaflet blades linear-oblanceolate.		52 C. kansuensis
13 (11)	Legume densely villous; corolla 2.5-2.8 cm; standard obovate-oblong; bark dark brown; branchlets grayish brown.		53 C. leveillei
+	Legume glabrous; corolla 2-2.5 cm; standard broadly obovate; bark grayish brown; branchlets bright gray.		54 C. opulens
14 (9)	Corolla pinkish to reddish at least when wilted; standard oblong-obovate.		55 C. rosea
+	Corolla yellow (but some species with an orange spot in middle of standard and some reddish yellow inside); standard broader (obovate, broadly obovate, ovate, broadly ovate, suborbicular, or orbicular)		(15)
15 (14)	Young ovary or both young ovary and young legume pubescent		(16)
+	Ovary and legume glabrous (ovary rarely with trichomes in C. laeta)		(20)
16 (15)	Corolla 1.5-1.8 cm; auricle of corolla wings 1/2-2/3 as long as claw.		56 C. qingheensis
+	Corolla 2-3.1 cm; auricle of corolla wings 1/3-2/5 as long as claw		(17)
17 (16)	Corolla 2.8-3.1 cm.		57 C. camilloi-schneideri
+	Corolla 2-2.2 cm		(18)
18 (17)	Pedicel 2-6 mm.		60 C. polourensis
+	Pedicel 6-20 mm		(19)
19 (18)	Leaflet blades obovate to oblanceolate, both surfaces densely pubescent.		58 C. licentiana
+	Leaflet blades obovate-cuneate, only abaxial surface sparsely pubescent.		59 C. shensiensis
20 (15)	Corolla 2.6-3.5 cm.		65 C. laeta
+	Corolla 1.3-2.3 cm		(21)
21 (20)	Corolla standard suborbicular; pedicel 9-21 mm.		66 C. frutex
+	Corolla standard obovate, broadly obovate, or broadly ovate; pedicel 2-8 mm		(22)
22 (21)	Legume 1-2.5(-3.5) cm; corolla 1.4-1.6 cm.		61 C. brevifolia
+	Legume 3-4.5 cm; corolla 1.6-2.3 cm		(23)
23 (22)	Auricle of corolla wings nearly as long as claw; standard broadly obovate, apex emarginate.		62 C. chinghaiensis
+	Auricle of corolla wings 1/5-1/3 as long as claw; standard ovate or obovate, apex obtuse		(24)
24 (23)	Leaflet blades 6-13 mm; legume 3-4 mm in diam..		63 C. densa
+	Leaflet blades 4-6 mm; legume 4-6 mm in diam..		64 C. turfanensis
25 (1)	All leaves 4-foliolate		(26)
+	Leaves 4-20-foliolate (at least some leaves on plant with more than 4 leaflets)		(28)
26 (25)	Leaves on long branchlets pinnate but on short branchlets sessile and digitate; claw of corolla wings ca. 1/3 as long as limb, auricle ± as long as claw.		1 C. dasyphylla
+	Leaves on long and short branches pinnate or sometimes digitate or only on short branches sometimes digitate; claw of corolla wings ca. 1/2 as long as limb, auricle short and obtuse		(27)
27 (26)	Corolla 2.8-3 cm; calyx tube 1.2-1.4 cm; apical pair of leaflets larger than others.		2 C. sinica
+	Corolla 2.2-2.5 cm; calyx tube 0.6-0.8 cm; leaflets all of equal size.		3 C. ussuriensis
28 (25)	Short branchlets with digitate or pinnate leaves and 4-foliolate, long branchlets with pinnate leaves and 4-8-foliolate		(29)
+	All branches with pinnate leaves and 4-20-foliolate		(32)
29 (28)	Old branches yellow; legume densely villous.		4 C. tragacanthoides
+	Old branches yellowish brown, reddish brown, or greenish brown; legume glabrous or pilose		(30)
30 (29)	Leaflet blades 1.5-2(-3) cm.		5 C. spinosa
+	Leaflet blades 0.3-1.2 cm		(31)
31 (30)	Flowers solitary or 2 or 3 in a fascicle; calyx tube 1-1.3 cm; corolla standard suborbicular.		6 C. pruinosa
+	Flowers solitary or to 4 in a fascicle; calyx tube 0.8-1 cm; corolla standard broadly ovate to oblong-obovate.		7 C. erinacea
32 (28)	Petiole and rachis caducous (only often caducous in C. boisii, rarely persistent in C. turkestanica)		(33)
+	Petiole and rachis persistent and spinelike at least on long branchlets		(48)
33 (32)	Calyx tube campanulate (campanulate-tubular in C. zahlbruckneri, tubular to broadly campanulate in C. manshurica), length and width nearly equal; leaflet blades often longer than 1 cm		(34)
+	Calyx tube campanulate or tubular, length longer than width; leaflet blades often shorter than 1 cm		(41)
34 (33)	Flowers usually in pairs on a peduncle, rarely solitary; leaves 4-8-foliolate; ovary sericeous.		27 C. soongorica
+	Flowers solitary (or 2 in a fascicle in C. zahlbruckneri, rarely 2 in a fascicle in C. fruticosa and C. manshurica, to 3 in a fascicle in C. boisii, to 5 in a fascicle in C. arborescens); leaves 8-20-foliolate; ovary pubescent or glabrous (densely sericeous in C. stipitata)		(35)
35 (34)	Ovary and legume stipitate.		28 C. stipitata
+	Ovary and legume not stipitate		(36)
36 (35)	Pedicel 0.8-1.5 cm		(37)
+	Pedicel 1-5 cm		(38)
37 (36)	Leaves 10-18-foliolate; current-year branchlets reddish brown; corolla 2.3-2.5 cm.		29 C. zahlbruckneri
+	Leaves 8-12-foliolate; current-year branchlets greenish brown; corolla 1.6-1.9 cm.		30 C. fruticosa
38 (36)	Flowers solitary or 2-5 in a fascicle		(39)
+	Flowers solitary (rarely 2 in a fascicle in C. manshurica)		(40)
39 (38)	Corolla 1.6-2 cm; spinelike stipules 5-10 mm; trees 2-6 m tall.		31 C. arborescens
+	Corolla 2-2.5 cm; spinelike stipules 8-15 mm; shrubs to 1.3 m tall.		32 C. boisii
40 (38)	Leaves 10-20-foliolate; limb of corolla keel ± cuneate.		33 C. manshurica
+	Leaves 6-10-foliolate; limb of corolla keel not cuneate.		34 C. turkestanica
41 (33)	Ovary and legume stipitate		(42)
+	Ovary and legume not stipitate		(43)
42 (41)	Legume falcately curved; old branches brown and glaucous; leaflets, pedicels, and current-year branchlets with dense trichomes, not glabrescent, glaucous.		35 C. davazamcii
+	Legume straight; old branches bright yellow and not glaucous; leaflets, pedicels, and current-year branchlets pubescent, glabrescent, not glaucous.		36 C. purdomii
43 (41)	Ovary and legume densely pubescent.		37 C. pekinensis
+	Ovary and legume glabrous, rarely sparsely pubescent		(44)
44 (43)	Spinelike stipules 10-13 mm; claw of corolla wings ca. 1/3 as long as limb; leaflet blades glabrous.		38 C. litwinowii
+	Spinelike stipules 1.5-7 mm; claw of corolla wings ca. 1/2 as long to almost as long as limb; leaflet blades with trichomes (sometimes glabrous in C. microphylla)		(45)
45 (44)	Leaflet blades obovate, obovate-oblong, or rarely almost elliptic, apex obtuse, truncate, or emarginate; legume cylindric, 4-5 cm × 4-5 mm		(46)
+	Leaflet blades lanceolate to narrowly oblong or elliptic to obovate-elliptic, apex acute, obtuse, rounded, or rarely truncate; legume lanceolate to oblong-lanceolate, 2-3.5 cm × 5-7 mm		(47)
46 (45)	Stipules usually obliquely erect; leaflet blades obovate to obovate-oblong, apex obtuse to truncate; ovary often glabrous.		39 C. microphylla
+	Stipules ± deflexed hooklike; leaflet blades obovate to rarely almost elliptic, apex emarginate; ovary sparsely appressed pubescent.		40 C. potaninii
47 (45)	Legume 2.5-3.5 cm × 5-6 mm; leaflet blades whitish green, both surfaces villous.		41 C. liouana
+	Legume 2-2.5 cm × 6-7 mm; leaflet blades whitish, both surfaces densely appressed sericeous.		42 C. korshinskii
48 (32)	Spinelike petiole and rachis persistent on long branchlets but caducous on short branchlets		(49)
+	Spinelike petiole and rachis persistent on both long and short branchlets		(52)
49 (48)	Leaves 4-10-foliolate.		8 C. acanthophylla
+	Leaves 8-18-foliolate		(50)
50 (49)	Leaflet blades obovate-lanceolate, apex acuminate; calyx tube 1-1.5 cm.		9 C. crassispina
+	Leaflet blades obovate-oblong, oblong, or elliptic, apex obtuse or acute; calyx tube 0.8-1.2 cm		(51)
51 (50)	Leaflet blade apices obtuse to acute; flowers solitary or in pairs on a peduncle; calyx tube dark brown; corolla standard emarginate at apex; wings with 1 auricle.		10 C. bicolor
+	Leaflet blade apices obtuse; flowers solitary, rarely in pairs on a peduncle; calyx tube yellowish brown; corolla standard either slightly emarginate or not at apex; wings with 2 auricles.		11 C. franchetiana
52 (48)	Corolla rosy, reddish purple, bright purple, pink, or white; calyx tube 1.4-1.7 cm.		12 C. jubata
+	Corolla yellow (yellowish white with reddish claws in C. chumbica, yellow but standard sometimes purple in C. roborovskyi); calyx tube 0.7-1.5 cm (to 2.1 cm in C. pleiophylla)		(53)
53 (52)	Corolla standard villous on both surfaces.		13 C. chumbica
+	Corolla standard glabrous on both surfaces		(54)
54 (53)	Ovary glabrous or nearly so		(55)
+	Ovary distinctly pubescent		(56)
55 (54)	Leaflet blades lanceolate to oblanceolate, 8-15 × 3-6 mm; legume lanceolate to narrowly obovoid.		14 C. kozlowii
+	Leaflet blades elliptic, 5-7 × 2-3 mm; legume cylindric.		25 C. tekesiensis
56 (54)	Corolla wings narrowly cuneate, auricle short to inconspicuous		(57)
+	Corolla wings not cuneate, with a distinct auricle		(58)
57 (56)	Standard oblong; calyx tubular, ca. 1 cm; leaves 6(or 8)-foliolate; leaflet blades oblong, apex acute; plant densely white villous.		15 C. cuneatoalata
+	Standard suborbicular; calyx campanulate, ca. 1.7 cm; leaves 8-10-foliolate; leaflet blades elliptic-obovate, apex blunt; plant densely fulvous villous.		16 C. aliensis
58 (56)	Legume inside glabrous		(59)
+	Legume inside with trichomes		(61)
59 (58)	Leaves (4 or)6-foliolate, apical pair often largest.		23 C. tangutica
+	Leaves 6-14-foliolate, all nearly equal		(60)
60 (59)	Leaf rachis 1-2.5 cm; calyx tube 10-12 mm; auricle of corolla wings slightly shorter than claw.		24 C. roborovskyi
+	Leaf rachis 2-3(-6.5) cm; calyx tube 7-10 mm; auricle of corolla wings only ca. 1 mm and much shorter than claw.		26 C. changduensis
61 (58)	Leaf rachis glaucous and glabrous or whitish pubescent.		17 C. leucospina
+	Leaf rachis neither glaucous nor whitish pubescent		(62)
62 (61)	Shrubs less than 30 cm tall; claw of corolla wing as long as or longer than limb		(63)
+	Shrubs more than 40 cm tall; claw of corolla wing shorter than limb		(64)
63 (62)	Shrubs cushion-shaped; leaflet blades linear, 8-12 mm; flowers subsessile; legume 0.7-0.8 cm.		18 C. tibetica
+	Shrubs caespitose but not cushion-shaped; leaflet blades oblong-elliptic, 4-5 mm; flowers with a 5-7 mm pedicel; legume 1.5-2 cm.		19 C. aegacanthoides
64 (62)	Pedicel 5-7 mm; calyx 1.5-2.1 cm; legume 3-3.5 cm.		20 C. pleiophylla
+	Pedicel 2-4 mm; calyx 1-1.3 cm; legume 1.5-2.5 cm		(65)
65 (64)	Leaves (4 or)6- or 8(or 10)-foliolate; leaflet blades elliptic to obovate, pubescent on both surfaces; claw of corolla keel shorter than limb; legume lanceolate to narrowly ovoid.		21 C. gerardiana
+	Leaves 8-12-foliolate; leaflet blades oblong, narrowly oblong, or obovate-oblong, pubescent only on abaxial surface; claw of corolla keel longer than limb; legume cylindric.		22 C. junatovii