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| 1 |
Young current year branchlets, leaves, and petioles all glabrous or glabrate |
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(2) |
| + |
Young current year branchlets, leaves, and petioles all ± rusty pubescent |
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(4) |
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| 2 (1) |
Panicle conspicuously with small leaves so whole inflorescence like a floral branchlet of 1.5-4 cm; pedicels short, 1-2 mm. |
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7 S. sichourensis |
| + |
Panicle not with small leaves; pedicels slender, more than 2 mm |
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(3) |
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| 3 (2) |
Leaf blade elliptic to ovate-elliptic, 10-13 × 5-7 cm, glaucous abaxially, apex abruptly shortly acuminate with obtuse acumen up to 2 cm, base cuneate to rounded and subequal on both sides, margin revolute and undulate, lateral veins usually ca. 6 pairs; panicle (2.5-)3-6.5 cm, generally solitary but always collaterally 2 or 3; perianth glabrous on both surfaces. |
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8 S. kwangsiensis |
| + |
Leaf blade ovate-elliptic, 6.5-11.5 × 2.7-6.3 cm, not glaucous abaxially, apex shortly acuminate but always obtuse or emarginate, base broadly cuneate, margin revolute but not undulate, lateral veins 3-5 pairs; panicle 2-4 cm, solitary; perianth glabrous outside, yellowish brown puberulent inside. |
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9 S. pingbienensis |
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| 4 (1) |
Fruits rugose when dry, densely rusty brown scurfy. |
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1 S. furfuracea |
| + |
Fruits smooth when dry, not scurfy |
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(5) |
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| 5 (4) |
Leaf blade conspicuously large, midrib, lateral veins, and transverse veins conspicuously elevated abaxially, very impressed adaxially, lateral veins 5-7 pairs. |
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2 S. marlipoensis |
| + |
Leaf blade smaller, midrib and lateral veins elevated abaxially, impressed adaxially, but transverse veins always opaque and inconspicuous adaxially |
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(6) |
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| 6 (5) |
Fruit turbinate, contracted into a short stalk at base. |
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3 S. chinensis |
| + |
Fruit globose or suboblate, not contracted into a short stalk at base |
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(7) |
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| 7 (6) |
Panicle very short, 0.9-1.2 cm; fruit subglobose, subtruncate at apex; leaf blade not foveolate. |
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4 S. fooningensis |
| + |
Panicle more elongate, 2-3.5(-4) cm; fruit globose, rounded or apiculate at apex; leaf blade foveolate on both surfaces |
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(8) |
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| 8 (7) |
Leaf blade glabrous adaxially, sparsely pubescent abaxially; petiole rusty tomentose; lateral veins 4-7 pairs, lateral veins and midrib impressed adaxially, conspicuously elevated abaxially; fruit ca. 4 cm in diam., apiculate, fruit stalk elongate, ca. 4 mm. |
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5 S. lotungensis |
| + |
Both surfaces of leaf blade as well as petiole sparsely yellowish brown puberulent when young but glabrate when mature; lateral veins ca. 5 pairs, lateral veins and midrib elevated on both surfaces; fruit up to 5.5 cm in diam., fruit stalk robust, ca. 1.5 cm. |
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6 S. anlungensis |
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