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| 1 |
Flowers distinctly pedicellate, in racemes or panicles; fruit maturity delayed to following year |
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(2) |
| + |
Flowers sessile or subsessile, in spikes or spicate panicles; fruit maturity in current year |
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(3) |
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| 2 (1) |
Leaves 5-12 × 2.5-5 cm, with 5 or 6(or 7) pairs of lateral veins. |
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18 S. henryi |
| + |
Leaves distinctly smaller, 0.8-2 × 0.7-1.2 cm, with 3 or 4 pairs of lateral veins. |
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19 S. pedicellata |
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| 3 (1) |
Rachis of inflorescence glabrous, rarely sparsely pubescent |
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(4) |
| + |
Rachis of inflorescence tomentose or densely pubescent |
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(9) |
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| 4 (3) |
Leaf blade 0.5-2(-2.5) cm × less than 1.4 cm, petiole 1-3 mm, lateral veins 3-5 pairs |
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(5) |
| + |
Leaf blade larger than 2.5 × 1.4 cm, petiole longer than 4 mm, lateral veins 2-8 pairs |
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(6) |
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| 5 (4) |
Leaves papery, often fascicled, leaf blade obovate or oblong, apex emarginate or rounded, margin entire or crenate; inflorescences usually inserted at middle of branches. |
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1 S. horrida |
| + |
Leaves leathery, not fascicled, but often distichous, leaf blade oblong or ovate-elliptic, apex obtuse or acute, not emarginate, margin minutely serrulate; inflorescences at ends of branchlets. |
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2 S. pycnophylla |
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| 6 (4) |
Leaves adaxially smooth; lateral veins few, 2 or 3(or 4) pairs. |
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3 S. paucicostata |
| + |
Leaves adaxially shiny; lateral veins 5-8 pairs |
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(7) |
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| 7 (6) |
Leaves abaxially barbate at vein axils, leaf bases asymmetric. |
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4 S. lucida |
| + |
Leaves abaxially glabrous, leaf bases symmetric |
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(8) |
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| 8 (7) |
Leaves papery or subleathery, apex acuminate or acute, margin not revolute; flowers usually in terminal spicate-paniculate inflorescences; fruit maturity in following year. |
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5 S. gracilis |
| + |
Leaves leathery or thickly so, apex obtuse or rounded, margin often revolute; flowers in axillary or terminal lax spikes; fruit maturity within current year. |
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6 S. camelliifolia |
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| 9 (3) |
Leaf blade abaxially glabrous or pubescent on veins, or barbate at vein axils |
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(10) |
| + |
Leaf blade abaxially tomentose, hairs persistent or ± deciduous |
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(14) |
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| 10 (9) |
Leaves up to 4.5 × 2.5 cm, lateral veins 3-5(-7) pairs, adaxially not impressed. |
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13 S. thea |
| + |
Leaves 4-15 cm × more than 3.5 cm, lateral veins 5-10 pairs, adaxially distinctly impressed |
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(11) |
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| 11 (10) |
Branchlets often with hooked, incurved long spines; leaf blade usually oblong, abaxially barbate at axils of veins, petioles glabrous; fruit ripe in current year |
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(12) |
| + |
Branchlets with erect spines or without spines; leaf blade usually ovate-elliptic, glabrous or abaxially pubescent on veins, petioles pubescent or sparsely pubescent; fruit ripe in following year |
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(13) |
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| 12 (11) |
Leaves leathery, major veins adaxially distinctly impressed. |
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14 S. hamosa |
| + |
Leaves papery, major veins adaxially inconspicuously impressed. |
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15 S. randaiensis |
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| 13 (11) |
Leaf blade leathery, abaxially glabrous, lateral veins 5-7 pairs, apex acuminate, rarely acute, base subrounded, slightly asymmetric. |
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16 S. melliana |
| + |
Leaf blade papery or thinly leathery, abaxially on veins pubescent, lateral veins 7-10 pairs, apex caudate-acuminate or long acuminate, base cordate or subrounded, never asymmetric. |
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17 S. subcaudata |
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| 14 (9) |
Leaf blade 1-2.5 × 0.3-1.5 cm, abaxially persistently densely tomentose |
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(15) |
| + |
Leaf blade larger than 3 × 1 cm, often ferruginous or canescent tomentose, hairs deciduous or not |
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(17) |
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| 15 (14) |
Leaf blade papery, margin explanate, lateral veins 4-6 pairs. |
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7 S. brandrethiana |
| + |
Leaf blade leathery, margin revolute or not, lateral veins 3 or 4 pairs |
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(16) |
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| 16 (15) |
Leaf blade dimorphic, large one 1.5-2.5 × 0.8-1.5 cm, small one 1-1.5 × 0.3-0.6 cm, all thickly leathery, margin revolute; calyx and ovary tomentose. |
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8 S. lijiangensis |
| + |
Leaf blade uniform, 1-1.5 × 0.7-1 cm, thinly leathery, margin explanate; calyx puberulous; ovary glabrous. |
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9 S. yilinii |
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| 17 (14) |
Leaf blade oblong, ovate-oblong, or ovate, apex acute, adaxially distinctly rugose. |
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10 S. rugosa |
| + |
Leaf blade lanceolate, lanceolate-oblong, or lanceolate-elliptic, apex acuminate or long acuminate, adaxially not rugose |
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(18) |
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| 18 (17) |
Leaves abaxially incanous or ferruginous tomentose, lateral veins 7-9 pairs; branchlets and petioles incanous or ferruginous tomentose. |
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11 S. omeiensis |
| + |
Leaves abaxially ferruginous tomentose, hairs later partly or wholly deciduous, lateral veins 5 or 6 pairs; branchlets and petioles ferruginous pubescent. |
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12 S. laxiflora |
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