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| 1 |
Shrubs usually deciduous; leaves papery or membranous, rarely leathery, margin serrate or serrulate |
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(2) |
| + |
Shrubs evergreen; leaves leathery, rarely papery, margin finely and densely serrate, rarely with incurved obtuse teeth |
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(4) |
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| 2 (1) |
Leaf blade oblong or oblong-lanceolate, rarely ovate, 2-2.5 × as long as wide or more, base usually cuneate, rarely subcordate or subobtuse. |
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7 S. himalaicus |
| + |
Leaf blade suborbicular, ovate, oblong-ovate, or obovate, rarely lanceolate, nearly as long as wide, rarely ca. 2 × as long as wide, base usually shallowly cordate, very rarely cuneate or subrounded |
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(3) |
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| 3 (2) |
Leaf blade suborbicular, apex obtuse to retuse or emarginate, abaxially densely white puberulous to glabrous, margin serrate. |
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5 S. retusus |
| + |
Leaf blade ovate, oblong-ovate, or suborbicular, rarely lanceolate, papery to membranous, apex acuminate to obviously caudate, abaxially glabrous, margin serrate or serrulate. |
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6 S. chinensis |
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| 4 (1) |
Leaf blade linear-lanceolate or narrowly lanceolate, 4-8 × as long as wide, 1-2 cm wide. |
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1 S. salicifolius |
| + |
Leaf blade ovate-lanceolate to obovate-lanceolate or obovate, less than 3 × as long as wide, 2-4 cm wide |
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(5) |
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| 5 (4) |
Leaf blade oblong to oblong-lanceolate, lateral veins joining a connecting vein, base usually cordate, rarely cuneate. |
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4 S. cordatulus |
| + |
Leaf blade ovate-lanceolate to obovate-lanceolate or obovate, lateral veins irregularly anastomosing at margin, base cuneate or obtuse |
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(6) |
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| 6 (5) |
Leaf blade ovate-lanceolate to obovate-lanceolate, apex usually shortly caudate, margin serrate throughout; inflorescences longer than 3 cm; peduncles 5-10 mm. |
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2 S. yunnanensis |
| + |
Leaf blade obovate, apex long caudate, margin usually serrate only in upper half; inflorescences shorter than 2 cm; peduncles 3-5 mm. |
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3 S. obovatus |
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