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| 1 |
Leaves usually 3-lobed |
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(2) |
| + |
Leaves usually not lobed, sometimes 3-lobed in young shoots |
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(8) |
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| 2 (1) |
Leaves deeply 3-lobed, middle lobe oblong-lanceolate. |
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47 A. yui |
| + |
Leaves shallowly 3-lobed, middle lobe ovate, triangular, or triangular-ovate |
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(3) |
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| 3 (2) |
Leaf lateral lobes nearly same size as middle lobe. |
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48 A. buergerianum |
| + |
Leaf lateral lobes usually smaller than middle lobe (sometimes with unlobed leaves on same tree) |
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(4) |
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| 4 (3) |
Lateral lobes long, apex acuminate |
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(5) |
| + |
Lateral lobes small, apex obtuse |
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(6) |
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| 5 (4) |
Leaf central lobe apically acuminate, lateral lobes triangular, petiole 2-5 cm. |
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49 A. paxii |
| + |
Leaf lobes apically acute, petiole 2.5-9 cm. |
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50 A. shihweii |
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| 6 (4) |
Margin of leaf lobe serrulate. |
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51 A. cordatum |
| + |
Margin of leaf lobe entire |
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(7) |
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| 7 (6) |
Branchlets, inflorescence, and petioles densely pubescent; leaf margin reflexed, abaxially pubescent. |
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52 A. sycopseoides |
| + |
Branchlets and petioles glabrous, inflorescence hairy when immature; leaf margin not reflexed, abaxially glabrous. |
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53 A. paihengii |
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| 8 (1) |
Young branchlets, petioles, and leaves abaxially pubescent. |
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54 A. coriaceifolium |
| + |
Young branchlets, petioles, and leaves abaxially usually glabrous |
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(9) |
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| 9 (8) |
Leaves papery |
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(10) |
| + |
Leaves thickly leathery or subleathery |
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(11) |
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| 10 (9) |
Leaf base cordate, abaxially light green, usually serrulate in upper part; samara purple-red when young. |
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51 A. cordatum |
| + |
Leaf base rounded, abaxially pale white, margin entire or undulate; samara green when young. |
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55 A. gracilifolium |
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| 11 (9) |
Leaf blade ovate, apex obtuse. |
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56 A. poliophyllum |
| + |
Leaf blade oblong, oblong-ovate, or lanceolate, apex acute to acuminate |
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(12) |
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| 12 (11) |
Samara less than 2 cm; leaf blade lanceolate or oblong, apex acuminate or acute |
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(13) |
| + |
Samara usually 2-3 cm; leaf blade oblong, apex usually acute |
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(14) |
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| 13 (12) |
Leaf blade 8-14 × 2.5-5 cm. |
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57 A. albopurpurascens |
| + |
Leaf blade 3.5-4.5 × 1.5-2 cm. |
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58 A. yinkunii |
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| 14 (12) |
Leaves adaxially shiny, abaxially conspicuously pale white, margin slightly reflexed. |
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59 A. lucidum |
| + |
Leaves adaxially not shiny and deep green, abaxially light green or pale green, margin not reflexed. |
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60 A. oblongum |
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