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| 1 |
Leaves palmately compound, leaflets 7-9 |
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(2) |
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Leaves simple |
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(3) |
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| 2 (1) |
Calyx divided for ca. 1/2 length or slightly more, lobes incurved, calyx tube well developed, campanulate; leaflet blades with lateral veins dense and apparent. |
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1 S. pexa |
| + |
Calyx divided to base, lobes recurved, calyx tube absent; leaflet blades with lateral veins lax and obscure. |
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2 S. foetida |
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| 3 (1) |
Leaf blade palmately divided, abaxially and adaxially densely brown tomentose, very densely so abaxially. |
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3 S. villosa |
| + |
Leaf blade not divided |
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(4) |
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| 4 (3) |
Leaf blade abaxially densely hairy |
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(5) |
| + |
Leaf blade abaxially glabrous or sparsely hairy only on veins |
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(8) |
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| 5 (4) |
Lead blade base obtuse, subrounded, or obliquely cordate |
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(6) |
| + |
Leaf blade base cuneate |
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(7) |
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| 6 (5) |
Leaf blade usually ovate-elliptic, base more or less obliquely cordate, basal veins 5, petiole ca. 5 cm. |
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11 S. euosma |
| + |
Leaf blade elliptic, base rounded or obtuse, basal veins 1, petiole 1-2 cm. |
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12 S. tonkinensis |
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| 7 (5) |
Leaf blade with one obvious pair of basal veins, abaxially not very densely hairy; epicalyx lobes as long as pedicels. |
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13 S. cinnamomifolia |
| + |
Leaf blade without a pair of basal veins, abaxially very densely hairy; epicalyx lobes much longer than pedicels. |
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14 S. pinbienensis |
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| 8 (4) |
Veins of old leaf blade abaxially sparsely stellate |
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(9) |
| + |
Veins of old leaf blade abaxially glabrous |
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(11) |
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| 9 (8) |
Lateral veins and veinlets apparently impressed adaxially, veinlets prominently raised abaxially, purple-red when dried. |
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4 S. impressinervis |
| + |
Lateral veins and veinlets not impressed adaxially, veinlets not impressed abaxially, not purple-red when dried |
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(10) |
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| 10 (9) |
Lateral veins 16-24 on each side of midrib, petiole 0.8-1 cm; calyx lobes much longer than calyx tube. |
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5 S. hymenocalyx |
| + |
Lateral veins 11 or 12 on each side of midrib, petiole 3-8 cm; calyx lobes as long as calyx tube. |
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7 S. micrantha |
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| 11 (8) |
Leaf blade base cordate. |
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10 S. ceramica |
| + |
Leaf blade base not or only slightly cordate |
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(12) |
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| 12 (11) |
Petiole to 1.2 cm. |
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20 S. brevissima |
| + |
Petiole at least 1.5 cm |
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(13) |
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| 13 (12) |
Lateral veins 12-20 on each side of the midrib |
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(14) |
| + |
Lateral veins 6-10 on each side of the midrib |
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(19) |
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| 14 (13) |
Branchlets densely hairy |
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(15) |
| + |
Branchlets glabrous or nearly so |
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(17) |
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| 15 (14) |
Leaf blade apex acute, base decurrent, cuneate or obtuse, petiole 1.5-3 cm; calyx green, subglabrous. |
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16 S. gengmaensis |
| + |
Leaf blade apex acuminate, base rounded to shallowly cordate, cuneate or acute, petiole 2.5-5.5 cm; calyx red or purple, exterior stellate hairy |
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(16) |
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| 16 (15) |
Inflorescence rachis indumentum yellow-brown; leaf blade base rounded or cuneate; epicalyx lobes as long as pedicels. |
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17 S. henryi |
| + |
Inflorescence rachis indumentum purple; leaf blade base shallowly cordate; epicalyx lobes ca. 1/2 as long as pedicels. |
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18 S. simaoensis |
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| 17 (14) |
Calyx tube well developed, campanulate; leaves clustered at branchlet tip. |
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8 S. kingtungensis |
| + |
Calyx divided to near base, lobes ± free; leaves not clustered |
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(18) |
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| 18 (17) |
Leaf blade 12-18 cm wide, petiole 5-12 cm; sepals ca. 20 mm. |
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15 S. scandens |
| + |
Leaf blade 2.5-6 cm wide, petiole 1.5-2.5 cm; sepals ca. 6 mm. |
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24 S. hainanensis |
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| 19 (13) |
Leaf blade obovate or narrowly obovate, 13-26 × 7-10 cm, apex rounded or with short acumen, lateral veins 5-9. |
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25 S. yuanjiangensis |
| + |
Leaf blade not as above, apex not rounded |
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(20) |
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| 20 (19) |
Base and apex of petiole pulvinate |
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(21) |
| + |
Petiole not pulvinate |
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(22) |
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| 21 (20) |
Petiole 2.5-3.5 cm. |
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23 S. lanceifolia |
| + |
Petiole 1-1.5 cm. |
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26 S. guangxiensis |
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| 22 (20) |
Calyx campanulate, lobes as long as calyx tube |
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(23) |
| + |
Calyx divided almost to base, lobes ± free |
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(24) |
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| 23 (22) |
Leaf blade oblong or elliptic, base rounded or obtuse. |
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6 S. monosperma |
| + |
Leaf blade oblanceolate or elliptic-obovate, base acute or cuneate. |
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9 S. subracemosa |
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| 24 (22) |
Sepals 10-20 mm, incurved and cohering with each other at apex. |
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19 S. principis |
| + |
Sepals 4-8 mm, spreading, starlike |
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(25) |
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| 25 (24) |
Inflorescence 10-18 cm; sepals ca. 8 mm, apex acuminate; leaf blade with 5 basal veins. |
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21 S. subnobilis |
| + |
Inflorescence less than 10 cm; sepals 4-6 mm, apex obtuse or with short acumen; leaf blade with 1-3 basal veins. |
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22 S. lanceolata |
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