1Infructescences cauline (inflorescence unknown). Leaves 1-foliolate. Pods densely pubescent, 2- or 3-seeded
1'Inflorescences and/or infructescences axillary and/or terminal
2Leaflets entirely glabrous on the lower surface
2'Leaflets velutinous-hirsute to minutely apressedly puberulous (at least on the midrib and nerves), rarely glabrescent and seemingly glabrous, on the lower surface
3Stipules falcate, or foliaceous, 5-9 mm long
3'Stipules ovate, very small or minute, up to 3.5 mm long
4Stipules connate at the base, 5-6 mm long. Leaves (l-)2-3(-4)-foliolate. Bracts at the base of peduncles usually subulate, up to 8 mm long, sometimes aggregate, surrounding the base and brush-like
4'Stipules free, 7.5-9 mm long. Bracts at the base of peduncles ovate, c. 3 mm long, not as above
5Stipules up to 7.5 mm long. Leaves (4-)5-6-foliolate. Pods obliquely obovate, 11 by 5-6 cm, puberulous
5'Stipules 9 mm long. Leaves 4- or 5-foliolate. Pods elliptic to elliptic-obovate, up to 15 by 6-7 cm, brown velvety
6Leaves 1- or 2-foliolate
6'Leaves 3- or 4-foliolate, rarely associated with some 1- or 2-foliolate ones (in C. gracilis)
7Leaves usually 1-foliolate, when 2-foliolate then leaflets often not opposite. Ovary 3- or 4-ovuled
7'Leaves usually with 2 opposite leaflets, sometimes 1-foliolate. Ovary 2-ovuled.
8Pedicels long, (7-)15-22(-30) mm. Calyx lobes usually puberulous on the central, longitudinal part inside. Pods shining
8'Pedicels very short, 0-2 mm. Calyx lobes glabrous inside
9Inflorescences erect, up to c. 5 cm long, rachis scurfy-velvety. Calyx lobes velvety outside. Ovary 6-ovuled
9'Inflorescences pendulous, longer, 8-30 cm long, rachis glabrous. Calyx lobes glabrous outside
10Leaves (l-)3-foliolate. Stamens 8 or 9
10'Leaves 4-foliolate. Stamens 5
11Bracts usually lanceolate to linear, 7-15 mm long. Bracteoles 6-9 mm long.
11'Bracts and bracteoles, if present, usually very small, less than 5 mm long..
12Pedicels 6-15 mm, articulated at the apex; bracteoles 2, opposite, at the apex of the pedicel. Pods velvety
12'Pedicels 15-20 mm, articulated at the base; bracteoles 2, subopposite or alternate, at the upper half of the pedicel. Pods shortly hairy
13Leaflets rotund or apiculate at the apex. Leaves (1- or) 2-foliolate. Pods brownish hairy
13'Leaflets often acuminate, caudate, or cuspidate at the apex
14Leaves usually 2- or 3-foliolate
14'Leaves usually more than 3-, up to 13-foliolate
15Stipules free. Inflorescences very short, up to 2.5 cm long. Flowers almost sessile. Pods densely ferruginous velvety, 1- (or 2-)seeded
15'Stipules connate at the base. Inflorescences much longer, 5-55 cm long. Flowers distinctly pedicelled
16Inflorescences 5-7 cm long. Pedicels 5-6 mm long. Pods finely rugulose
16'Inflorescences much longer, 12-55 cm long. Pedicels less than 2.5 mm. Pods (as now known) smooth
17Climber. Inflorescences pendulous, up to 55 cm long, rachis glabrous. Ovary 2-ovuled
17'Tree. Inflorescences erect or pendulous, 12-45 cm long, rachis (densely) puberulous. Ovary 3-5-ovuled
18Inflorescences erect, up to 12 cm long. Bracteoles at the apex of pedicel. Filaments of stamens 3-7(-10) mm
18'Inflorescences pendulous, up to 45 cm long. Bracteoles on the pedicel. Filaments of stamens up to 12 mm
19Leaves 9-13-foliolate. Pedicels 6-15 mm, with 2 bracteoles at the middle. Ovary 1- or 2-ovuled; style very short, c. 2 mm
19'Leaves usually less than 9-foliolate
20Inflorescences pendulous, 20-31 cm long
20'Inflorescences erect, usually 9-17 cm long
21Pedicels (1.5-3 mm) articulated at the apex
21'Pedicels (2-7 mm) articulated at the base
22Leaves (2- or) 3- or 4-foliolate. Calyx lobes broadly ovate or suborbiculate, 3-4 by 2.5-3 mm. Style very short, c. 3 mm
22'Leaves 5- or 6(-8)-foliolate. Calyx lobes elliptic, 5-6 by 3 mm. Style long, up to 12 mm
23Pedicels 6-15 mm, articulated at the apex. Ovary 2- (or l-)ovuled. Style c. 2 mm. Leaves 6-9- (or 10-)foliolate
23'Pedicels usually shorter, 2-5(-6) mm
24Pedicels articulated at the apex
24'Pedicels articulated at the base
25Leaves 7- or 8-foliolate. Ovary 2- or 3-ovuled; style very short, 1-2.5 mm. Pods rather small, 2.5-4 by 1.5-2 cm
25'Leaves 3- or 4-foliolate. Ovary 4(-6)-ovuled; style up to 6 mm. Pods unknown
26Filaments of stamens alternately longer and shorter
26'Filaments of stamens almost equal in length
27Leaves 3-7-foliolate. Bracts small, 1-1.5 mm long. Ovary (3- or) 4-ovuled; style 3.5-6 mm
27'Leaves 3- or 4-foliolate. Bracts larger, up to 4 mm long. Ovary 2(-4)-ovuled; style c. 8 mm