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| 1 |
Petiole and rachis of leaves without glands |
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(2) |
| + |
Petiole and rachis of leaves with glands |
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(5) |
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| 2 (1) |
Petiole and rachis of leaves with 2 longitudinal ribs, narrowly winged; legume with a membranous wing at middle downward to base of each valve. |
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1 S. alata |
| + |
Petiole and rachis of leaves without wings |
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(3) |
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| 3 (2) |
Leaflets abaxially densely yellowish brown velutinous; legume narrowly cylindric. |
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4 S. spectabilis |
| + |
Leaflets abaxially glabrous and farina-white; legume flattened |
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(4) |
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| 4 (3) |
Leaflets 6-10 pairs; stipules linear, caducous. |
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2 S. siamea |
| + |
Leaflets 8-16 pairs; stipules ovate-cordate, tardily deciduous. |
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3 S. didymobotrya |
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| 5 (1) |
Glands on petiole only |
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(6) |
| + |
Glands only present on rachis between leaflets |
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(9) |
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| 6 (5) |
Gland on upper part of petiole, blackish brown, discoid, sessile; leaflets 8-28 pairs. |
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8 S. nomame |
| + |
Leaf with a solitary gland above base of petiole; leaflets 3-10 pairs |
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(7) |
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| 7 (6) |
Young branchlets, petiole, and rachis of leaves densely yellowish brown villous; leaflets villous on both surfaces; legume densely hirsute on surfaces of valves. |
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5 S. hirsuta |
| + |
Plants glabrous or subglabrous throughout; legume glabrous |
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(8) |
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| 8 (7) |
Petiolar gland sessile, globose or ovoid, at basal joint; legume flattened, 10-13 cm. |
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6 S. occidentalis |
| + |
Petiolar gland narrow, clavate to subulate, above basal joint; legume terete, 5-10 cm, with light-colored suture. |
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7 S. sophera |
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| 9 (5) |
Leaflets 2 pairs, obliquely ovate, very unequally sided, 4-16.5 × 2-7 cm, larger half facing leaf base. |
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9 S. fruticosa |
| + |
Leaflets 3 to more pairs, smaller than above |
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(10) |
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| 10 (9) |
Leaflets 10-26(-50) pairs, a conical or narrowly ovoid gland between lowermost pair of leaflets (often early caducous). |
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10 S. multijuga |
| + |
Leaflets 3-9 pairs |
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(11) |
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| 11 (10) |
Fertile stamens 10 |
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(12) |
| + |
Fertile stamens 7 |
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(13) |
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| 12 (11) |
Leaflets 4-6 pairs; leaves 15-30 cm; stipe of legume 10-20 mm. |
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11 S. sulfurea |
| + |
Leaflets 6-9 pairs; leaves 10-15 cm; stipe of legume 5-7 mm. |
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12 S. surattensis |
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| 13 (11) |
Rachis of leaves with a gland between lowest pair of leaflets. |
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15 S. bicapsularis |
| + |
Rachis of leaves with a gland between each pair of leaflets |
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(14) |
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| 14 (13) |
Legume terete, 6-10 × ca. 1 cm; leaflets ovate to ovate-elliptic, apex acute to acuminate. |
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13 S. septemtrionalis |
| + |
Legume linear, terete, 10-15 × ca. 0.5 cm; leaflets obovate, apex broadly rounded. |
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14 S. tora |
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