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| 1 |
Trees, rarely shrubs; petiole base inflated, covering caducous bud stipules; stipels present; inflorescence paniculate |
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(2) |
| + |
Small trees, shrubs, subshrubs, or herbs; petioles not inflated at base, buds exposed; stipules present or absent; stipels absent; inflorescence racemose |
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(3) |
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| 2 (1) |
Ovary almost equal to stamens in length; legume linear, slightly constricted between seeds; seeds closely spaced. |
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20 S. japonica |
| + |
Ovary obviously shorter than stamens in length; legume thick, obviously constricted between seeds; seeds more distantly spaced. |
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21 S. brachygyna |
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| 3 (1) |
Herbs or subshrubs; flowers white to creamy white; raceme terminal |
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(4) |
| + |
Small trees, shrubs, or climbing shrubs; flowers white-yellow or purple, or, if herbs, flowers yellow; inflorescence terminal, opposite or alternate with leaves |
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(6) |
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| 4 (3) |
Legume indehiscent, seeds 2 per loment section; leaflets small, (3.5-)15-20(-27) × (2-)3-7 mm. |
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19 S. pachycarpa |
| + |
Legume tardily dehiscent, seed 1 per loment section; leaflets large, 1.5-6 × 1-2 cm |
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(5) |
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| 5 (4) |
Branches and leaflets densely hairy; flowers in dense racemes; keel mucronate at apex. |
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10 S. alopecuroides |
| + |
Branches and leaflets glabrous or pilose when young; flowers in lax racemes; keel obtuse at apex. |
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11 S. flavescens |
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| 6 (3) |
Plants spiny; stipules spinescent |
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(7) |
| + |
Plants without spines; stipules not spinescent |
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(8) |
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| 7 (6) |
Stems villous; flower ca. 2 cm, blue-purple. |
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8 S. moorcroftiana |
| + |
Stems glabrous; flower ca. 1.5 cm, white or creamy white, rarely blue-purple. |
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9 S. davidii |
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| 8 (6) |
Legume winged; plants flowering before leaves expand; some terminal leaflets changed to tendrils. |
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12 S. mollis |
| + |
Legume wingless; plants flowering after leaves expand; terminal leaflets normal |
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(9) |
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| 9 (8) |
Stipules absent or very small |
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(10) |
| + |
Stipules subulate, 4-10 mm |
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(12) |
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| 10 (9) |
Legume slightly curved; leaflets obviously smaller toward base; stipules very small; standard shorter than other petals. |
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7 S. tonkinensis |
| + |
Legume straight; leaflets not obviously smaller toward base; stipules absent; standard equal to other petals |
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(11) |
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| 11 (10) |
Shrubs or small trees, 2-4 m tall; leaflets large, 2.5-5 × 2-3.5 cm; flowers large, ca. 15 mm, yellow or creamy white. |
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13 S. tomentosa |
| + |
Subshrubs, 0.2-1 m tall; leaflets small, 1-2.5 × 0.7-1.5 cm; flowers small, ca. 10 mm, purple. |
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18 S. praetorulosa |
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| 12 (9) |
Legume dehiscent into 4 limbs; calyx compressed campanulate or cup-shaped, teeth small or not obvious |
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(13) |
| + |
Legume dehiscent into 2 limbs; calyx campanulate, teeth obvious, unequal |
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(16) |
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| 13 (12) |
Leaflet veins not obvious adaxially; seed 1 per legume, gray-brown |
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(14) |
| + |
Leaflet veins obvious adaxially; seeds 2-4 per legume, red |
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(15) |
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| 14 (13) |
Inflorescence terminal; leaflets oblong or ovate-oblong, reflexed at margin; corolla ca. 10 mm. |
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14 S. franchetiana |
| + |
Inflorescence alternate or opposite a leaf; leaflets ovate or ovate-elliptic, not reflexed at margin; corolla ca. 15 mm. |
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15 S. wilsonii |
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| 15 (13) |
Leaflets papery to nearly leathery, ovate-elliptic, ovate, or long elliptic, acute or shortly acuminate at apex. |
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16 S. prazeri |
| + |
Leaflets papery, ovate-oblong or ovate-lanceolate, long acuminate or caudate-acuminate at apex. |
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17 S. benthamii |
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| 16 (12) |
Leaflets small, less than 20 mm, ovate or elliptic-ovate, densely long hairy on both surfaces. |
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4 S. yunnanensis |
| + |
Leaflets large, (15-)20-40(-50) mm, usually ovate-lanceolate, or other shapes except ovate and elliptic-ovate, pilose adaxially or glabrous |
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(17) |
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| 17 (16) |
Inflorescence terminal, rarely opposite a leaf; flowers dense, yellow; seeds green. |
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6 S. xanthoantha |
| + |
Inflorescence opposite a leaf, pseudo-terminal or axillary; flowers sparse, white or purple-red; seeds yellow, yellow-brown, or red-brown |
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(18) |
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| 18 (17) |
Flowers white; seeds long ovoid, 7-8 mm. |
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5 S. albescens |
| + |
Flowers purple-red; seeds oblong or long ovate, 5-9 mm |
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(19) |
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| 19 (18) |
Fine veins on leaflets impressed adaxially; seeds long ovate, 5-6 mm. |
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2 S. dunnii |
| + |
Fine veins on leaflets not impressed adaxially; seeds oblong, elliptic, or long ovate, 6-9 mm |
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(20) |
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| 20 (19) |
Legume slender; seeds long ovate or elliptic, ends rounded, 6-7 mm. |
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3 S. microcarpa |
| + |
Legume thick, slightly compressed; seeds oblong-reniform, ends acute to rounded, 7-9 mm, yellow or yellow-brown. |
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1 S. velutina |
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