| 1 |
Stamens monadelphous, axillary filament connate to other filaments above middle (only D. sequax to below middle) |
|
(2) |
| + |
Stamens diadelphous, axillary filament free from other filaments |
|
(9) |
| |
|
|
|
| 2 (1) |
Stipules linear; keel equal to wings; legume moniliform, with dense rust-colored or brown minute hooked hairs. |
|
32 D. sequax |
| + |
Stipules mostly narrowly ovate; keel shorter than wings; legume not moniliform, with hooked and straight hairs or glabrous |
|
(3) |
| |
|
|
|
| 3 (2) |
Bracteoles absent |
|
(4) |
| + |
Bracteoles present |
|
(5) |
| |
|
|
|
| 4 (3) |
Legume densely appressed sericeous; leaflets abaxially sericeous, midvein and lateral veins conspicuous. |
|
25 D. multiflorum |
| + |
Legume glabrous; leaflets abaxially velutinous, veins inconspicuous. |
|
26 D. amethystinum |
| |
|
|
|
| 5 (3) |
Terminal leaflet 5-17 cm wide |
|
(6) |
| + |
Terminal leaflet 1-5 cm wide |
|
(7) |
| |
|
|
|
| 6 (5) |
Young branchlets white pubescent; terminal leaflet ovate or broadly ovate, base oblique, abaxially densely sericeous. |
|
30 D. megaphyllum |
| + |
Young branchlets densely white or gray tomentose; terminal leaflet orbicular, ovate, or obovate, base not oblique, abaxially densely gray or white tomentose. |
|
31 D. yunnanense |
| |
|
|
|
| 7 (5) |
Terminal leaflet lanceolate or lanceolate-linear, more than 4 × as long as wide; legume glabrous. |
|
29 D. stenophyllum |
| + |
Terminal leaflet not as above, if lanceolate, then less than 2 × as long as wide; legume hairy or subglabrous |
|
(8) |
| |
|
|
|
| 8 (7) |
Apex of standard emarginate; keel not mucronate at apex; young branchlets pubescent. |
|
27 D. elegans |
| + |
Apex of standard orbicular, not emarginate; keel mucronate at apex; young branchlets subglabrous. |
|
28 D. callianthum |
| |
|
|
|
| 9 (1) |
Legume linear, articles linear, oblong, or oblong-linear to narrowly obovoid, ca. 3 × as long as wide or more |
|
(10) |
| + |
Legume narrowly oblong, articles often orbicular, nearly oblong, or nearly quadrate, nearly as long as wide or slightly longer |
|
(15) |
| |
|
|
|
| 10 (9) |
Leaves 1-foliolate (D. gracillimum rarely 3-foliolate near base of stem) |
|
(11) |
| + |
Leaves 3-foliolate |
|
(12) |
| |
|
|
|
| 11 (10) |
Leaves 1-foliolate, leaflet blade ovate, ovate-elliptic, or lanceolate, 5-12 × 2-5 cm; legume 8-12 cm, 6-8-jointed, articles longer than 12 mm. |
|
4 D. zonatum |
| + |
Leaves often 1-foliolate, sometimes 3-foliolate near base of stem, leaflet blade broadly triangular or broadly ovate, 2-3.5 × 1.5-2.5 cm; legume 2-3.5 cm, 3-5-jointed, articles 6-7 mm. |
|
5 D. gracillimum |
| |
|
|
|
| 12 (10) |
Terminal leaflet elliptic-oblong, 1-4 × 0.7-2.5 cm, lateral veins 4 or 5; stipules ca. 2 mm. |
|
6 D. scorpiurus |
| + |
Terminal leaflet basically ovate-elliptic, 4.5-10(-15) × 3-6(-8) cm, lateral veins 7-12; stipules 7-10 mm |
|
(13) |
| |
|
|
|
| 13 (12) |
Legume plicate when young; pedicels deflexed after flowering; flowers opening almost at same time; articles oblong; leaves always 3-foliolate. |
|
3 D. hispidum |
| + |
Legume always straight; pedicels not deflexed after flowering; flowers opening one by one; articles linear to narrowly oblong; leaves 3- or 1-3-foliolate |
|
(14) |
| |
|
|
|
| 14 (13) |
Terminal leaflet ovate or ovate-elliptic, lateral veins 9-12; upper lobe of calyx entire or nearly so at apex. |
|
1 D. laxiflorum |
| + |
Terminal leaflet rhombic-ovate or obovate, lateral veins 7-9; upper lobe of calyx 2-toothed at apex. |
|
2 D. diffusum |
| |
|
|
|
| 15 (9) |
Leaves 1-foliolate (D. styracifolium sometimes 3-foliolate) |
|
(16) |
| + |
Leaves 3-foliolate (D. dichotomum, D. heterophyllum, D. microphyllum, D. reticulatum, and D. tortuosum sometimes mixed 1-foliolate leaves near base of stem) |
|
(22) |
| |
|
|
|
| 16 (15) |
Leaflets orbicular to broadly obovate, reniform, or compressed rhombic |
|
(17) |
| + |
Leaflets not as above, longer than wide |
|
(18) |
| |
|
|
|
| 17 (16) |
Leaflets orbicular to broadly obovate, abaxially densely adpressed white sericeous, lateral veins 8-10. |
|
20 D. styracifolium |
| + |
Leaflets reniform or compressed rhombic, abaxially glabrous, lateral veins 3 or 4. |
|
21 D. renifolium |
| |
|
|
|
| 18 (16) |
Leaflets 1-2.2 × 0.7-1.2 cm; legume glabrous. |
|
19 D. rubrum |
| + |
Leaflets longer than 3 cm; legume hairy or nearly glabrous |
|
(19) |
| |
|
|
|
| 19 (18) |
Flowers crowded on peduncles; leaflets yellow-brown velutinous on both surfaces. |
|
14 D. velutinum |
| + |
Flowers lax, scattered on peduncles; leaflets adaxially glabrous, abaxially pubescent or villous |
|
(20) |
| |
|
|
|
| 20 (19) |
Flowering pedicel ca. 12 mm; legume subglabrous, glabrescent. |
|
13 D. oblongum |
| + |
Flowering pedicel 2-5 mm; legume with hooked hairs |
|
(21) |
| |
|
|
|
| 21 (20) |
Corolla green-white; petioles with dense straight and minute hooked hairs. |
|
11 D. gangeticum |
| + |
Corolla purple; petioles sparsely villous. |
|
12 D. flexuosum |
| |
|
|
|
| 22 (15) |
Terminal leaflet shorter than 2.5 cm |
|
(23) |
| + |
Terminal leaflet usually longer than 2.5 cm |
|
(26) |
| |
|
|
|
| 23 (22) |
Racemes 6-flowered to numerous |
|
(24) |
| + |
Flowers solitary, in pairs at axils, or 2 or 3 scattered on peduncle |
|
(25) |
| |
|
|
|
| 24 (23) |
Leaflets obtriangular-ovate or obovate, 1-2.5 × 1-1.6 cm; branchlets spreading yellow-brown or rust-colored pubescent; seed without aril. |
|
15 D. griffithianum |
| + |
Larger leaflets narrowly obovate-elliptic or narrowly elliptic, 1-1.2 × 0.4-0.6 cm, smaller leaflets obovate or elliptic, 0.2-0.6 × 0.15-0.4 cm; branchlets nearly glabrous; seed arillate. |
|
22 D. microphyllum |
| |
|
|
|
| 25 (23) |
Terminal leaflet broadly elliptic or broadly obovate; flowering pedicel 10-25 mm; articles of legume 3.5-4 mm. |
|
23 D. heterophyllum |
| + |
Terminal leaflet obcordate, obtriangular, or obovate; flowering pedicel 3-8 mm; articles of legume shorter than 2.5 mm. |
|
24 D. triflorum |
| |
|
|
|
| 26 (22) |
Racemes shorter than 7 cm; flowers dense |
|
(27) |
| + |
Racemes longer than 10 cm; flowers slightly sparse |
|
(28) |
| |
|
|
|
| 27 (26) |
Rachis densely yellowish spreading hooked hairy; legume erect. |
|
16 D. heterocarpon |
| + |
Rachis densely gray-white adpressed villous; legume pendent. |
|
17 D. strigillosum |
| |
|
|
|
| 28 (26) |
Terminal leaflet narrowly ovate, or ovate-elliptic to narrowly elliptic, adaxially glabrous. |
|
18 D. reticulatum |
| + |
Terminal leaflet elliptic, broadly elliptic, ovate, broadly ovate, or rhombic-ovate to obovate, adaxially sparsely hairy |
|
(29) |
| |
|
|
|
| 29 (28) |
Upper suture of legume straight or slightly undulate, lower suture constricted between articles |
|
(30) |
| + |
Both sutures of legume constricted between articles, moniliform |
|
(31) |
| |
|
|
|
| 30 (29) |
Shrubs with terete and glabrescent branches; terminal leaflet elliptic or obovate. |
|
9 D. concinnum |
| + |
Prostrate or climbing herbs with triangular stems; terminal leaflet broadly ovate to rhombic, rarely elliptic. |
|
10 D. intortum |
| |
|
|
|
| 31 (29) |
Flowering pedicel 8-17 mm, with minute hooked and glandular hairs; bracts caducous; leaflets sparsely hairy on both surfaces. |
|
7 D. tortuosum |
| + |
Flowering pedicel 2-5 mm, with minute hooked hairs and minute pubescence; bracts persistent; leaflets adaxially with adpressed and intermixed hooked hairs, abaxially densely adpressed hairy. |
|
8 D. dichotomum |
