| 1 |
Leaves 3-foliolate; calyx subcampanulate |
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(2) |
| + |
Leaves simple; calyx subcampanulate or 2-lipped |
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(12) |
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| 2 (1) |
Legume 0.3-0.5 cm, 2-seeded |
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(3) |
| + |
Legume 2-4 cm, (4-)20-30-seeded |
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(4) |
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| 3 (2) |
Leaflet blades elliptic, 2-3 × 1-1.5 cm; legume ca. 5 mm in diam.; corolla keel without twisted beak. |
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5 C. uncinella |
| + |
Leaflet blades obovate to oblanceolate, 1-2 × 0.3-0.8 cm; legume 3-4 mm in diam.; corolla keel with twisted beak. |
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39 C. medicaginea |
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| 4 (2) |
Legume densely pubescent, not glabrescent; corolla only slightly longer than calyx |
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(5) |
| + |
Legume thinly pubescent when young, later glabrous; corolla ca. 2 × as long as calyx |
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(8) |
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| 5 (4) |
Leaflet blades suborbicular to elliptic-obovate, 2-4 × 1-2 cm; stems spreading pilose. |
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1 C. incana |
| + |
Leaflet blades elliptic to narrowly elliptic, 5-7 × 2-4 cm; stems appressed pilosulose |
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(6) |
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| 6 (5) |
Corolla 10-15 mm; legume 2.5-4 × 1-1.5 cm. |
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2 C. micans |
| + |
Corolla 5-9 mm; legume ca. 2 × 0.5-1 cm |
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(7) |
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| 7 (6) |
Leaflet blades elliptic to oblong-elliptic, 3-5 × 2-2.5 cm, apex obtuse; legume stipe ca. 4 mm. |
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3 C. jianfengensis |
| + |
Leaflet blades narrowly elliptic, 5-7 × 2.5-4 cm, apex acuminate; legume stipe absent. |
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4 C. bracteata |
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| 8 (4) |
Calyx glabrous |
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(9) |
| + |
Calyx with trichomes |
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(10) |
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| 9 (8) |
Leaflet blades oblong to narrowly elliptic, 2-3 cm wide; corolla standard orbicular. |
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9 C. trichotoma |
| + |
Leaflet blades linear to linear-lanceolate, 0.5-1 cm wide; corolla standard oblong. |
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10 C. ochroleuca |
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| 10 (8) |
Legume compressed, 4-8-seeded. |
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6 C. psoraleoides |
| + |
Legume inflated, 20- or more seeded |
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(11) |
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| 11 (10) |
Leaflet blades oblong to elliptic, 3-6 × 1.5-3 cm. |
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7 C. pallida |
| + |
Leaflet blades linear to linear-lanceolate, 5-9(-12) × 0.5-1 cm. |
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8 C. lanceolata |
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| 12 (1) |
Stipules lanceolate-lunate; corolla pale yellow, white, or often tinged blue. |
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11 C. verrucosa |
| + |
Stipules not lanceolate-lunate, sometimes absent; corolla red, purple, purplish blue, yellow, or rarely pale yellow or white |
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(13) |
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| 13 (12) |
Corolla purplish red to purple or purplish blue |
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(14) |
| + |
Corolla usually yellow, rarely pale yellow or white |
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(17) |
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| 14 (13) |
Flowers in a condensed headlike raceme; corolla deep purple or purplish blue. |
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27 C. mairei |
| + |
Flowers in an elongated raceme or rarely solitary; corolla purplish red to purple |
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(15) |
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| 15 (14) |
Plant prostrate; leaf blade obovate to obovate-elliptic, less than 2 × as long as wide; legume with trichomes. |
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23 C. hainanensis |
| + |
Plant erect; leaf blade linear-lanceolate to elliptic-oblanceolate, more than 2.5 × as long as wide; legume glabrous |
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(16) |
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| 16 (15) |
Leaf blade 2-4 × 0.6-0.8 cm, adaxially with trichomes; plants ca. 0.6 m tall. |
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22 C. chiayiana |
| + |
Leaf blade 5-8 × ca. 2 cm, adaxially glabrous; plants 1-1.5 m tall. |
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24 C. occulta |
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| 17 (13) |
Stipules winglike, decurrent along stem. |
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12 C. alata |
| + |
Stipules not winglike, sometimes absent |
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(18) |
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| 18 (17) |
Plant ca. 9 cm tall, erect; leaf blade 0.5-1 cm |
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(19) |
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Plant 20-150 cm tall or prostrate; leaf blade 1.5-20(-25) cm |
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(20) |
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| 19 (18) |
Calyx subcampanulate, 5-6 mm, lobes all similar; corolla standard without glandular trichomes. |
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41 C. tiantaiensis |
| + |
Calyx 2-lipped, ca. 7 mm, adaxial 2 lobes distinctly wider than abaxial 3 lobes; corolla standard with glandular trichomes along margin near base. |
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42 C. anningensis |
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| 20 (18) |
Legume ovoid-globose, 0.4-0.7 cm, 6-12-seeded |
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(21) |
| + |
Legume cylindric, 1-4(-6) cm, 10-30-seeded |
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(24) |
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| 21 (20) |
Bracts ovate-triangular, 6-7 mm; calyx 8-10 mm, divided for ca. 1/2 its length. |
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35 C. dubia |
| + |
Bracts lanceolate or linear, 1.5-3(-4) mm; calyx 4-7 mm, deeply divided |
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(22) |
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| 22 (21) |
Leaf blade broadly ovate-elliptic to suborbicular, apex not mucronate. |
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36 C. humifusa |
| + |
Leaf blade narrowly linear, oblanceolate, or oblong, apex mucronate |
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(23) |
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| 23 (22) |
Leaf blade oblanceolate to oblong; plants ascending to erect, 50-100 cm tall; inflorescences elongated, 10-20 cm. |
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37 C. linifolia |
| + |
Leaf blade narrowly linear; plants prostrate to erect, to 30 cm tall; inflorescences very short and headlike. |
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38 C. nana |
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| 24 (20) |
Legume 1-1.5 cm, 10-15(-30)-seeded; herbs |
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(25) |
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Legume 2-4(-6) cm, (10-)20-30-seeded; herbs or shrublets |
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(33) |
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| 25 (24) |
Stipules absent |
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(26) |
| + |
Stipules present but sometimes caducous |
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(29) |
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| 26 (25) |
Leaf blade 3-8 × 2-4 mm, elliptic to ovate, adaxially glabrous. |
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34 C. similis |
| + |
Leaf blade 10-60 × 4-25 mm, elliptic to linear, adaxially usually with trichomes (sometimes glabrous in C. chinensis) |
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(27) |
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| 27 (26) |
Corolla standard 4-5 mm; calyx 3-4 mm. |
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33 C. prostrata |
| + |
Corolla standard 6-11 mm; calyx 5-10 mm |
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(28) |
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| 28 (27) |
Leaf blade oblong-linear to linear; racemes 1-5-flowered. |
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29 C. chinensis |
| + |
Leaf blade narrowly elliptic to elliptic; racemes 5-30-flowered. |
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32 C. yunnanensis |
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| 29 (25) |
Stipules needlelike, ca. 1 mm |
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(30) |
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Stipules linear, 2-6 mm |
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(31) |
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| 30 (29) |
Racemes terminal or axillary, 20-30-flowered. |
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30 C. albida |
| + |
Racemes axillary, (1 or)2- or 3-flowered. |
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31 C. uliginosa |
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| 31 (29) |
Leaf blade orbicular to elliptic; corolla 4-6 mm. |
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28 C. acicularis |
| + |
Leaf blade linear, linear-lanceolate, or elliptic-oblanceolate; corolla 8-12 mm |
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(32) |
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| 32 (31) |
Leaf blade linear-elliptic to elliptic-oblanceolate, ca. 2 cm wide. |
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24 C. occulta |
| + |
Leaf blade linear to linear-lanceolate, 0.5-1 cm wide. |
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26 C. sessiliflora |
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| 33 (24) |
Calyx 2-3 cm, black when mature. |
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25 C. calycina |
| + |
Calyx less than 1.5 cm, brownish yellow when mature |
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(34) |
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| 34 (33) |
Stems 3- or 4-angled |
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(35) |
| + |
Stems terete |
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(36) |
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| 35 (34) |
Stems 4-angled; leaf blade 10-20(-25) cm; racemes 6-10-flowered; legume 4-5 cm. |
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18 C. tetragona |
| + |
Stems 3-angled; leaf blade 2-3 cm; racemes 1-3-flowered; legume ca. 2 cm. |
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40 C. triquetra |
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| 36 (34) |
Stipules 5-30 mm |
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(37) |
| + |
Stipules 1-3 mm |
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(39) |
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| 37 (36) |
Stipules leaflike, broadly lanceolate, 10-30 mm. |
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13 C. mysorensis |
| + |
Stipules ovate-triangular, lanceolate, or triangular-lanceolate, 5-10 mm |
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(38) |
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| 38 (37) |
Stems and leaf blade adaxially glabrous; leaf blade 7-15 cm; stipules ovate-triangular, ca. 10 mm. |
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14 C. spectabilis |
| + |
Stems and leaf blade adaxially pilose; leaf blade 2-6 cm; stipules lanceolate to triangular-lanceolate, 5-8 mm. |
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21 C. ferruginea |
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| 39 (36) |
Leaf blade obovate to obovate-elliptic, 1-3 cm; corolla yellow or purplish red. |
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23 C. hainanensis |
| + |
Leaf blade narrowly elliptic, lanceolate, or linear, 5-12 cm; corolla always yellow |
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(40) |
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| 40 (39) |
Corolla 1-1.2(-1.5) cm, equal to or only slightly exserted beyond calyx |
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(41) |
| + |
Corolla 1.5-2.5 cm, clearly exserted beyond calyx |
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(42) |
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| 41 (40) |
Leaf blade linear to oblong-linear, 4-7 × 0.4-1 cm; legume 3-4 cm, densely brown silky pubescent. |
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19 C. yaihsienensis |
| + |
Leaf blade narrowly elliptic, 6-11 × 2-3 cm; legume 1-2.5 cm, glabrous. |
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20 C. kurzii |
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| 42 (40) |
Leaf blade linear-lanceolate to oblong-linear, 0.5-2 cm wide. |
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17 C. juncea |
| + |
Leaf blade oblanceolate or narrowly elliptic, 2-4 cm wide |
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(43) |
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| 43 (42) |
Leaf blade apex obtuse to acuminate, mucronate; legume 4-6 cm. |
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15 C. assamica |
| + |
Leaf blade apex emarginate, not mucronate; legume 2.5-3 cm. |
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16 C. retusa |
