1	Leaf blade abaxially pale white to pale gray, margin entire or remotely toothed with a few sinuous teeth; fruiting pedicels slender, 2.5-4 cm; infructescence 10-32 cm		(2)
+	Leaf blade abaxially light green, margin toothed or rarely entire; fruiting pedicels relatively thick, 0.7-2(-4) cm; infructescence 7-12(-16) cm		(3)
2 (1)	Leaf blade 9-11 × 11-12 cm, abaxially very sparsely pubescent on veins and veinlets, though hairs not detectable by touch, 3-lobed, base rounded; nutlets 3.5-4.3 × 0.8-1.3 cm.		84 A. leipoense
+	Leaf blade 10-20 × 11-25 cm, very densely pubescent and hairs easily detectable by touch, 5-lobed, base cordate; nutlets 4.7-5.5 × 1.4-1.7 cm.		85 A. yangbiense
3 (1)	Samara 8-12 cm; leaf blade 3-lobed or unlobed, margin usually entire.		86 A. thomsonii
+	Samara 3.5-6.5 cm; leaf blade 3- or 5-lobed, lobes toothed		(4)
4 (3)	Flowers purple-red; leaf blade 5-lobed, rarely 3-lobed, lobes triangular, very remotely dentate or entire.		87 A. sinopurpurascens
+	Flowers green; leaf blade 3-, 5-, or 7-lobed, margin toothed		(5)
5 (4)	Leaf blade 3-, 5-, or 7-lobed, lobes obtuse.		88 A. sterculiaceum
+	Leaf blade 3-lobed, lobes acute		(6)
6 (5)	Leaf blade small, papery, secondary veins 9-11 pairs; infructescence 4-5 cm, pedicel slender; nutlets irregularly convex.		91 A. tsinglingense
+	Leaf blade large, leathery or subleathery, secondary veins 14-24 pairs; infructescence 7-12 cm; pedicel stout; nutlets distinctly convex		(7)
7 (6)	Leaf blade subleathery, margin crenate, abaxially densely yellowish pilose; infructescence 7-9 cm; samara wing including nutlet 4-4.5 cm, yellowish pilose.		89 A. kungshanense
+	Leaf blade leathery, margin undulate or crenate, abaxially glabrous; infructescence ca. 12 cm; samara wing including nutlet 6-6.5 cm, glabrous.		90 A. lungshengense