| 1 |
Leaf blade abaxially pubescent or tomentose at least on primary and secondary veins |
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(2) |
| + |
Leaf blade abaxially without trichomes |
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(6) |
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| 2 (1) |
Leaf blade abaxially with trichomes extending across entire surface; petioles and peduncles pubescent or tomentose |
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(3) |
| + |
Leaf blade abaxially with trichomes restricted to primary and secondary veins; petioles and peduncles glabrous |
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(4) |
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| 3 (2) |
Abaxial surface of leaf blades, petioles, and peduncles tomentose; perianth lacking red pigmentation; tepals 5-7. |
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9 S. tomentella |
| + |
Abaxial surface of leaf blades, petioles, and peduncles pubescent; perianth with red pigmentation; tepals 7 or 8. |
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10 S. pubescens |
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| 4 (2) |
Largest tepals 2-5 mm wide; staminate flowers with (4 or)5(-7) stamens; flower peduncle 0.6-2.8 cm (staminate), 0.7-3.5 cm (pistillate). |
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16 S. chinensis |
| + |
Largest tepals 6-10.5 mm wide; staminate flowers with 14-28 stamens; flower peduncle 2.3-5.2 cm (staminate), 5-7.1 cm (pistillate) |
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(5) |
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| 5 (4) |
Young branches lacking wings; leaf blade abaxially not glaucous; staminate flowers with 14-19 stamens; seeds smooth to ± rugulose. |
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11 S. pubinervis |
| + |
Young branches narrowly winged; leaf blade abaxially variably glaucescent; staminate flowers with 18-28 stamens; seeds tuberculate to very tuberculate. |
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15 S. longipes |
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| 6 (1) |
Flowers solitary, paired, or in clusters; stamens connate into an androecial mass |
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(7) |
| + |
Flowers solitary; stamens essentially distinct but apical stamens occasionally connate |
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(8) |
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| 7 (6) |
Leaf blade venation adaxially not prominent; fused androecium subglobose to globose; thecae borne on distinct connectives arising from cavities on surface of fused androecium; fruit torus 2-6.5 cm; apocarps 4.5-9 × 4-8.5 mm. |
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18 S. propinqua |
| + |
Leaf blade venation adaxially prominent; fused androecium elongate; thecae sessile, located on opposing sides of cavities on surface of fused androecium; fruit torus 5-17 cm; apocarps ca. 10 × 12 mm. |
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19 S. plena |
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| 8 (6) |
Staminate flowers with 5 stamens radiating horizontally outward from a broad floral apex (forming a 5-merous staminal "shield"). |
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17 S. bicolor |
| + |
Staminate flowers with (4 or)5-70 stamens ± spirally arranged around an elongate floral axis |
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(9) |
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| 9 (8) |
Largest tepals 0.6-2.3 cm; pollen 3-colpate; pistillate flowers with (35-)50-120 carpels; pseudostyle large and broad |
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(10) |
| + |
Largest tepals 0.3-1.3 cm; pollen 6-colpate; pistillate flowers with 14-65 carpels; pseudostyle small or narrow |
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(13) |
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| 10 (9) |
Leaf blade 3.5-8(-12.5) × 1.5-3(-6.5) cm; stamens partially adnate with broad floral axis, only uppermost free with short distinct filaments. |
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4 S. sphaerandra |
| + |
Leaf blade 5.5-15 × 2-5.5(-7.5) cm; stamens distinct |
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(11) |
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| 11 (10) |
Perianth deep purplish red to deep red. |
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2 S. rubriflora |
| + |
Perianth cream, white, or flesh-pink |
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(12) |
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| 12 (11) |
Perianth cream or white; fruit torus 13-18(-25) cm. |
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1 S. grandiflora |
| + |
Perianth flesh-pink; fruit torus 5-11 cm. |
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3 S. incarnata |
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| 13 (9) |
Young branches narrowly or conspicuously winged. |
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14 S. henryi |
| + |
Young branches lacking wings |
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(14) |
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| 14 (13) |
Staminate flowers with (4 or)5(-7) stamens; apical stamens not connate. |
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16 S. chinensis |
| + |
Staminate flowers with 7-40 stamens; apical stamens generally connate |
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(15) |
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| 15 (14) |
Largest tepals 3-6.5 mm; pistillate flowers with 14-24 carpels; fruit torus 1.5-6.5 cm |
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(16) |
| + |
Largest tepals 4-12 mm; pistillate flowers with 20-56 carpels; fruit torus 2-15.5(-22) cm |
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(17) |
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| 16 (15) |
Leaf blade narrow, 2-3.7 × as long as wide; fruit torus 3-6.5 cm. |
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12 S. lancifolia |
| + |
Leaf blade broad, 1-1.9(-2.5) × as long as wide; fruit torus 1.5-3.5 cm. |
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13 S. micrantha |
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| 17 (15) |
Leaf blade abaxially conspicuously glaucous. |
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8 S. glaucescens |
| + |
Leaf blade abaxially not glaucous |
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(18) |
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| 18 (17) |
Leaf blade secondary and lower order veins not prominent abaxially or adaxially; seed testa smooth. |
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6 S. sphenanthera |
| + |
Leaf blade secondary and lower order veins prominent abaxially and often adaxially; seed testa smooth, rugulose, or rarely tuberculate |
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(19) |
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| 19 (18) |
Leaf blade venation dark after drying. |
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5 S. neglecta |
| + |
Leaf blade venation pale after drying. |
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7 S. arisanensis |
