1 |
Stamens monadelphous, axillary filament connate to other filaments above middle (only D. sequax to below middle) |
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(2) |
+ |
Stamens diadelphous, axillary filament free from other filaments |
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(9) |
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2 (1) |
Stipules linear; keel equal to wings; legume moniliform, with dense rust-colored or brown minute hooked hairs. |
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32 D. sequax |
+ |
Stipules mostly narrowly ovate; keel shorter than wings; legume not moniliform, with hooked and straight hairs or glabrous |
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(3) |
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3 (2) |
Bracteoles absent |
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(4) |
+ |
Bracteoles present |
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(5) |
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4 (3) |
Legume densely appressed sericeous; leaflets abaxially sericeous, midvein and lateral veins conspicuous. |
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25 D. multiflorum |
+ |
Legume glabrous; leaflets abaxially velutinous, veins inconspicuous. |
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26 D. amethystinum |
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5 (3) |
Terminal leaflet 5-17 cm wide |
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(6) |
+ |
Terminal leaflet 1-5 cm wide |
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(7) |
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6 (5) |
Young branchlets white pubescent; terminal leaflet ovate or broadly ovate, base oblique, abaxially densely sericeous. |
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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. |
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31 D. yunnanense |
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7 (5) |
Terminal leaflet lanceolate or lanceolate-linear, more than 4 × as long as wide; legume glabrous. |
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29 D. stenophyllum |
+ |
Terminal leaflet not as above, if lanceolate, then less than 2 × as long as wide; legume hairy or subglabrous |
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(8) |
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8 (7) |
Apex of standard emarginate; keel not mucronate at apex; young branchlets pubescent. |
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27 D. elegans |
+ |
Apex of standard orbicular, not emarginate; keel mucronate at apex; young branchlets subglabrous. |
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28 D. callianthum |
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9 (1) |
Legume linear, articles linear, oblong, or oblong-linear to narrowly obovoid, ca. 3 × as long as wide or more |
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(10) |
+ |
Legume narrowly oblong, articles often orbicular, nearly oblong, or nearly quadrate, nearly as long as wide or slightly longer |
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(15) |
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10 (9) |
Leaves 1-foliolate (D. gracillimum rarely 3-foliolate near base of stem) |
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(11) |
+ |
Leaves 3-foliolate |
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(12) |
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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. |
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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. |
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5 D. gracillimum |
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12 (10) |
Terminal leaflet elliptic-oblong, 1-4 × 0.7-2.5 cm, lateral veins 4 or 5; stipules ca. 2 mm. |
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6 D. scorpiurus |
+ |
Terminal leaflet basically ovate-elliptic, 4.5-10(-15) × 3-6(-8) cm, lateral veins 7-12; stipules 7-10 mm |
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(13) |
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13 (12) |
Legume plicate when young; pedicels deflexed after flowering; flowers opening almost at same time; articles oblong; leaves always 3-foliolate. |
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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 |
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(14) |
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14 (13) |
Terminal leaflet ovate or ovate-elliptic, lateral veins 9-12; upper lobe of calyx entire or nearly so at apex. |
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1 D. laxiflorum |
+ |
Terminal leaflet rhombic-ovate or obovate, lateral veins 7-9; upper lobe of calyx 2-toothed at apex. |
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2 D. diffusum |
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15 (9) |
Leaves 1-foliolate (D. styracifolium sometimes 3-foliolate) |
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(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) |
|
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16 (15) |
Leaflets orbicular to broadly obovate, reniform, or compressed rhombic |
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(17) |
+ |
Leaflets not as above, longer than wide |
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(18) |
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17 (16) |
Leaflets orbicular to broadly obovate, abaxially densely adpressed white sericeous, lateral veins 8-10. |
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20 D. styracifolium |
+ |
Leaflets reniform or compressed rhombic, abaxially glabrous, lateral veins 3 or 4. |
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21 D. renifolium |
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18 (16) |
Leaflets 1-2.2 × 0.7-1.2 cm; legume glabrous. |
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19 D. rubrum |
+ |
Leaflets longer than 3 cm; legume hairy or nearly glabrous |
|
(19) |
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19 (18) |
Flowers crowded on peduncles; leaflets yellow-brown velutinous on both surfaces. |
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14 D. velutinum |
+ |
Flowers lax, scattered on peduncles; leaflets adaxially glabrous, abaxially pubescent or villous |
|
(20) |
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20 (19) |
Flowering pedicel ca. 12 mm; legume subglabrous, glabrescent. |
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13 D. oblongum |
+ |
Flowering pedicel 2-5 mm; legume with hooked hairs |
|
(21) |
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21 (20) |
Corolla green-white; petioles with dense straight and minute hooked hairs. |
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11 D. gangeticum |
+ |
Corolla purple; petioles sparsely villous. |
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12 D. flexuosum |
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22 (15) |
Terminal leaflet shorter than 2.5 cm |
|
(23) |
+ |
Terminal leaflet usually longer than 2.5 cm |
|
(26) |
|
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23 (22) |
Racemes 6-flowered to numerous |
|
(24) |
+ |
Flowers solitary, in pairs at axils, or 2 or 3 scattered on peduncle |
|
(25) |
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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. |
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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 |
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25 (23) |
Terminal leaflet broadly elliptic or broadly obovate; flowering pedicel 10-25 mm; articles of legume 3.5-4 mm. |
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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 |
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26 (22) |
Racemes shorter than 7 cm; flowers dense |
|
(27) |
+ |
Racemes longer than 10 cm; flowers slightly sparse |
|
(28) |
|
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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) |
|
|
|
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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 |