1	Leaf blade triplinerved		(2)
+	Leaf blade pinninerved		(3)
2 (1)	Buds, branchlets, and leaf blade densely ferruginous pubescent; fruit 2.5-4.5 × 1-2 cm, fruiting pedicel robust, 0.5-0.6 cm × 3-4 mm.		1 A. obovata
+	Buds, branchlets, and leaf blade glabrous; fruit ca. 2.5 × 1.5 cm, fruiting pedicel slender, ca. 1 cm × 2 mm.		2 A. menghaiensis
3 (1)	Bud scales persistent, surrounding bases of branchlets		(4)
+	Bud scales caducous		(9)
4 (3)	Bud scales smaller, 3-8 × 2-6 mm, densely arranged		(5)
+	Bud scales larger, 10-22 × 6-10 mm, sparsely arranged		(6)
5 (4)	Leaf blade narrowly lanceolate, thickly leathery, lateral veins 18-26 pairs, obscure or nearly obscure abaxially; fruit glabrous.		3 A. obscurinervia
+	Leaf blade oblanceolate or oblong, leathery, lateral veins 6-10 pairs, conspicuously prominent abaxially; fruit yellow appressed tomentose.		4 A. trichocarpa
6 (4)	Petiole less than 7 mm; lateral veins 7-9 pairs; leaf base rounded or broadly cuneate.		5 A. koshepangii
+	Petiole more than 11 mm; lateral veins 11-15 pairs; leaf base cuneate		(7)
7 (6)	Petiole glabrous; leaf blade glabrous abaxially (only gray puberulent when young, soon glabrous).		6 A. omeiensis
+	Petiole and leaf blade abaxially densely tomentose		(8)
8 (7)	Leaf blade elliptic, oblong-elliptic, or obovate-elliptic, broader, mostly more than 5 cm in diam.; petiole up to 4 cm; fruit subglobose, fruiting pedicel 4-5 mm.		7 A. kweichowensis
+	Leaf blade elliptic-lanceolate, narrower, mostly less than 5 cm in diam.; petiole up to 2 cm; fruit oblong, fruiting pedicel 11-15 mm.		8 A. forrestii
9 (3)	Lateral veins 30-40 pairs or more.		9 A. lecomtei
+	Lateral veins less than 15 pairs		(10)
10 (9)	Inflorescence or fruiting inflorescence paniculiform		(11)
+	Inflorescence or fruiting inflorescence umbellate		(12)
11 (10)	Branchlets, young leaves, and inflorescence ferruginous tomentose; leaf blade obovate, rarely elliptic; fruiting tube subflat disciform.		15 A. pilosa
+	Branchlets with dense grayish appressed tomentum, leaf blade pubescent along midrib and veins abaxially, and inflorescence white sericeous; leaf blade lanceolate; fruiting tube shallowly cup-shaped.		14 A. henryi
12 (10)	Young branchlets glabrous.		16 A. acuminata
+	Young branchlets hairy		(13)
13 (12)	Petiole shorter, 3-8 mm		(14)
+	Petiole longer, usually 10-40 mm		(16)
14 (13)	Leaf blade oblanceolate or obovate-lanceolate; filaments longer, ca. 6.5 mm, villous.		10 A. tsaii
+	Leaf blade not as above; filaments shorter, ca. 4 mm, glabrous		(15)
15 (14)	Leaf blade oblong-ovate, base rounded or broadly cuneate, lateral veins 7-9 pairs.		5 A. koshepangii
+	Leaf blade oblong-lanceolate to oblong, base acuminate or acute, lateral veins 8-13 pairs.		11 A. cupularis
16 (13)	Leaf blade oblanceolate, obovate-lanceolate, occasionally oblong, thinner		(17)
+	Leaf blade long lanceolate, lanceolate, elliptic to oblong-elliptic, thicker		(18)
17 (16)	Leaves 5-7-verticillate, leaf blade 14-20.5 × 3.5-6.5 cm, appressed pubescent abaxially; fertile stamens 9-15, filaments glabrous.		12 A. paotingensis
+	Leaves scattered, leaf blade 6-12 × 1.8-3 cm, densely gray-yellow villous abaxially; fertile stamens 9, filaments villous.		17 A. mushaensis
18 (16)	Midrib prominent on both surfaces of leaf blade; fruit globose, smaller.		13 A. glaucina
+	Midrib concave on leaf blade adaxially; fruit oblong or subglobose		(19)
19 (18)	Leaf blade abaxially and petiole glabrous; fruit subglobose, to 20 mm in diam..		6 A. omeiensis
+	Leaf blade abaxially and petiole hairy; fruit oblong, 6-8 mm in diam..		8 A. forrestii