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| 1 |
Legume winged, wings 5-10 mm wide (C. subg. Mezonevron (Desfontaines) J. E. Vidal ex Herendeen & Zarucchi) |
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(2) |
| + |
Legume wingless or narrowly winged; wing less than 5 mm wide (C. subg. Caesalpinia) |
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(4) |
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| 2 (1) |
Leaflets usually more than 4 cm; pinnae usually 2-5 pairs; petals smooth, glabrous, inner one broad and short, shortly clawed; legume samara-like, oblong, zygomorphic, 1-seeded at central part. |
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15 C. cucullata |
| + |
Leaflets usually not more than 2.5 cm; pinnae usually 6-10 pairs; petals hairy, inner one with long claw; legume 3-7-seeded |
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(3) |
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| 3 (2) |
Leaflets glabrous; seeds swollen-ridged at middle; legume conspicuously swollen opposite each seed. |
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16 C. enneaphylla |
| + |
Leaflets hairy, especially densely so abaxially; legume and seeds not as above. |
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17 C. hymenocarpa |
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| 4 (1) |
Legume fleshy, indehiscent |
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(5) |
| + |
Legume not fleshy |
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(6) |
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| 5 (4) |
Rachis of leaves 17-23 cm; pinnae 3-6 cm; leaflets adaxially hairy, not shiny. |
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13 C. digyna |
| + |
Rachis of leaves 30-40 cm; pinnae 5-16 cm; leaflets adaxially glabrous or shortly hairy, shiny. |
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14 C. tortuosa |
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| 6 (4) |
Legume spiny or bristly |
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(7) |
| + |
Legume without spines and setae |
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(9) |
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| 7 (6) |
Legume obovoid, falcate, 4-5 × ca. 1 cm, much longer than wide, setose, 1- or 2-seeded. |
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3 C. mimosoides |
| + |
Legume oblong, 5-13 × 4-5 cm, densely spiny, 2-8-seeded |
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(8) |
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| 8 (7) |
Stipules large, leaflike, parted or lobed; bracts subulate; petals yellow; legume 5-7 × 4-5 cm, ca. as long as wide; seeds subglobose. |
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1 C. bonduc |
| + |
Stipules subulate; bracts elliptic; petals whitish, tinged with red spots; legume 7.5-13 × 4-4.5 cm; seeds terete. |
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2 C. minax |
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| 9 (6) |
Legume ovoid, elliptic, ± oblong, or lanceolate-oblong |
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(10) |
| + |
Legume compressed, suborbicular, ± obliquely broadly ovoid, or obliquely oblong |
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(15) |
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| 10 (9) |
Leaflets abaxially farinose-brown when dry; legume ventral sutures narrowly winged, apex without beak. |
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9 C. caesia |
| + |
Leaflets abaxially not farinose-brown; legume ventral sutures narrowly winged or not winged, apex with or without beak |
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(11) |
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| 11 (10) |
Legume oblong-ligulate or oblanceolate-oblong, 6-9-seeded or more; pedicels 3.5-7 cm |
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(12) |
| + |
Legume suboblong, oblong to elliptic, or oblong-obovoid, 1-4-seeded; pedicels to ca. 2 cm |
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(13) |
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| 12 (11) |
Climbers with copious prickles; legume oblong-ligulate, 2.5-3 cm wide, narrowly winged along ventral suture, dehiscent. |
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11 C. decapetala |
| + |
Small trees, without or with scattered, sparse prickles; legume oblanceolate-oblong, 1.5-2 cm wide, not winged along ventral suture, indehiscent. |
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12 C. pulcherrima |
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| 13 (11) |
Leaflets 10-17 pairs per pinna, papery, 10-20 × 5-7 mm; legume woody. |
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10 C. sappan |
| + |
Leaflets 2 pairs per pinna, leathery, 60-130 × 25-80 mm; legume leathery |
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(14) |
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| 14 (13) |
Leaflets 2.5-3 cm wide, glabrous, apex acuminate; legume dehiscent. |
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18 C. yunnanensis |
| + |
Leaflets 4.5-8 cm wide, abaxially brown hairy, apex rounded or obtuse; legume indehiscent. |
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19 C. elliptifolia |
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| 15 (9) |
Leaflets 7-13 mm; legume leathery, winged along ventral suture. |
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4 C. millettii |
| + |
Leaflets 15-150 mm; legume woody or leathery, winged or not winged along ventral suture |
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(16) |
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| 16 (15) |
Leaflets 6-10 pairs, ovate-lanceolate, apex acuminate, abaxially glaucous; legume without reticulate veins. |
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8 C. vernalis |
| + |
Leaflets 2-6 pairs, elliptic, ovate, oblong, or broadly ovate; legume with conspicuous reticulate veins |
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(17) |
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| 17 (16) |
Legume woody; leaflets to 15 cm. |
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5 C. magnifoliolata |
| + |
Legume leathery; leaflets not more than 9 cm |
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(18) |
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| 18 (17) |
Apices of leaflets acuminate; legume with wings ca. 3 mm wide, along ventral sutures. |
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6 C. sinensis |
| + |
Apices of leaflets obtuse-rounded, sometimes emarginate, rarely acute; legume not winged or wings obscure |
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(19) |
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| 19 (18) |
Leaflets 4-6 pairs per pinna, ovate or elliptic, 3-6 × 1.5-3 cm. |
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7 C. crista |
| + |
Leaflets 3 or 4 pairs per pinna, slightly rhombic, 1.5-2 × 0.8-1.2 cm. |
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20 C. rhombifolia |
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