1	Leaf blade 3-lobed, margin undulate; lobes obtuse.		1 A. miaotaiense
+	Leaf blade 3-, 5-, or 7-lobed, or unlobed, margin entire or rarely dentate; middle lobes usually acute or acuminate		(2)
2 (1)	Shoots gray or brownish yellow		(3)
+	Shoots green or purple-green		(6)
3 (2)	Leaf blade 4-6 × 3-6 cm, usually 3-lobed, rarely undivided, suborbicular or ovate, base rounded or subcordate, margin entire or slightly sinuate, apex obtuse or acute, abaxially glabrous except slightly pubescent at vein axil.		9 A. tenellum
+	Leaf blade 7-13 × 5-20 cm, usually 3- or 7-lobed, base truncate or obtuse, apex acuminate, abaxially densely pubescent or glabrous		(4)
4 (3)	Leaves abaxially densely pubescent, usually 3-lobed, or unlobed when young.		10 A. fulvescens
+	Leaves abaxially glabrous, usually 5-lobed, sometimes 3- or 7-lobed		(5)
5 (4)	Nutlets convex and thick; leaf base usually truncate, lobes sometimes dentate.		11 A. truncatum
+	Nutlets flat and thin; leaf base rounded or cordate, lobes entire.		12 A. pictum
6 (2)	Nutlets slightly convex		(7)
+	Nutlets flat, thin		(9)
7 (6)	Leaf blade 3- or 5-lobed.		6 A. shenkanense
+	Leaf blade 5- or 7-lobed		(8)
8 (7)	Wing including nutlet 2-5 cm × 5-9 mm; leaves abaxially glabrous or slightly pubescent, base truncate or cordate.		7 A. cappadocicum
+	Wing including nutlet 3.5-4 cm × ca. 12 mm; leaves abaxially densely yellow-gray tomentose, base rounded.		8 A. tibetense
9 (6)	Leaves glabrous		(10)
+	Leaves abaxially pubescent		(11)
10 (9)	Leaf blade unlobed or 3-lobed, 4-11 × 2.5-4(-8) cm, apex caudate-acuminate; nutlet including wing ca. 2.5 cm.		2 A. chunii
+	Leaf blade 3- or 5-lobed, rarely unlobed, 10-20 × 4-26 cm, apex usually obtuse or acute; nutlet including wing (2.5-)3-4.5 cm.		3 A. amplum
11 (9)	Leaf blade usually 3-lobed or unlobed when young, base rounded or slightly cordate; nutlets conspicuously veined.		4 A. longipes
+	Leaf blade usually 5- or 7-lobed, base truncate or cordate; nutlets not veined.		5 A. acutum