1	Leaves palmately compound		(2)
+	Leaves simple, palmately lobed or divided, lobes (if present) joined at base by continuous tissue		(10)
2 (1)	Inflorescence with 2-5 umbels, primary axis less than 15 cm		(3)
+	Inflorescence with more than 10 umbels, primary axis at least 30 cm		(6)
3 (2)	Leaflets abaxially glaucous; ovary 3- or 4-carpellate.		21 B. kwangsiensis
+	Leaflets abaxially not glaucous; ovary 2-carpellate		(4)
4 (3)	Leaflets 3(or 4); inflorescence terminal.		22 B. tripteris
+	Leaflets (3-)5-9; inflorescence axillary		(5)
5 (4)	Leaflets narrowly lanceolate, 13-24 × 1.5-2.5 cm, sessile or subsessile (petiolules to 0.5 cm), adaxially glabrous, secondary veins 12-21 pairs.		23 B. angustifolia
+	Leaflets ovate or elliptic-lanceolate, 8-20 × 3-8 cm, petiolules 0.5-3.5 cm, adaxially sparsely shortly setose, secondary veins 6-8 pairs.		24 B. gracilis
6 (2)	Petiolules stout, 2.5-5 mm in diam., leaflets densely brown to ferruginous stellate pubescent; inflorescence with short bristles.		16 B. chengkangensis
+	Petiolules slender, 1-1.5 mm in diam.; leaflets and inflorescence ferruginous tomentose or glabrescent		(7)
7 (6)	Ovary (3 or)4- or 5-carpellate; inflorescence with persistent spiny bracts.		17 B. producta
+	Ovary 2-carpellate; inflorescence lacking spiny bracts		(8)
8 (7)	Petiolules very short, to 1 cm; leaflets narrowly elliptic to linear.		18 B. shweliensis
+	Petiolules (1.5-)2-10 cm; leaflets oblong to ovate-elliptic or broadly linear		(9)
9 (8)	Leaflets 15-35 × 6-15 cm, margin entire or sparsely serrulate; fruit didymo-globose or globose.		19 B. glomerulata
+	Leaflets 10-15 × 3.5-4.5 cm, margin sharply serrate; fruit ellipsoid-globose.		20 B. quercifolia
10 (1)	Umbels generally 2-5(or 6) per inflorescence; branches generally without prickles; shrubs		(11)
+	Umbels (5 or)6 to many per inflorescence; branches prickly; trees or shrubs		(14)
11 (10)	Inflorescence axillary; leaves deeply 3- or 4-lobed, lobes elliptic.		15 B. moumingensis
+	Inflorescence terminal (rarely also lateral); leaves entire or 2- or 3(-5)-lobed		(12)
12 (11)	Leaves entire or 2- or 3(-5)-lobed, blade and lobes ovate-lanceolate to narrowly lanceolate; inflorescence ferruginous pubescent (eventually glabrescent).		14 B. ferruginea
+	Leaves 3(-5)-lobed, inflorescence glabrous or bristly, lacking ferruginous pubescence		(13)
13 (12)	Leaf base deeply cordate, margin weakly serrate, teeth triangular, 4-11 mm apart; inflorescence glabrous.		12 B. ficifolia
+	Leaf base truncate to very shallowly cordate, margin ciliate-serrulate, teeth linear, curved, spine-tipped, 2-4 mm apart; inflorescence bristly.		13 B. triloba
14 (10)	Inflorescence unarmed		(15)
+	Inflorescence prickly (sometimes sparsely so)		(19)
15 (14)	Leaves not divided or lobed, oblong-elliptic or elliptic.		7 B. simplicifolia
+	Leaves divided, 3-11-lobed		(16)
16 (15)	Leaves 3-7-lobed, bases of lobes only slightly narrowed if at all		(17)
+	Leaves 7-11-lobed, bases of lobes distinctly narrowed (sometimes forming a pseudo-petiolule)		(18)
17 (16)	Ovary 5-carpellate, leaves (5-)7-lobed; mature fruit 10.5-14 mm high.		10 B. grushvitzkyi
+	Ovary 2-carpellate, leaves 3-5-lobed; mature fruit 7-9 mm high.		11 B. stellata
18 (16)	Pedicels slender, (8-)10-30 mm, bracts subtending flowers 1-2 mm, caducous; inflorescence terminal or pseudo-lateral.		8 B. fatsioides
+	Pedicels stout, 5-8(-12) mm, bracts subtending flowers 4-10 mm, stiff, persistent; inflorescence pseudo-lateral, borne on woody stems below leaves.		9 B. dumicola
19 (14)	Lobes of leaves divided less than 1/2 way to base, broadly ovate-triangular to nearly rounded, at most 1.5 × as long as distance between sinuses.		1 B. hainla
+	Lobes divided at least 1/2 way to base, elliptic to ovate or obovate (often narrowly so), 2-3 × as long as distance between sinuses		(20)
20 (19)	Inflorescence lateral, borne below leaves		(21)
+	Inflorescence terminal, borne above leaves		(22)
21 (20)	Leaves 3-5-lobed, margins irregularly serrate, larger teeth 2-2.5 mm; primary axis of inflorescence not more than 35 cm.		5 B. tibetana
+	Leaves (5-)7-9(-11)-lobed, margins ciliate-serrulate, teeth 1-1.5 mm; primary axis of inflorescence (20-)30-150 cm.		6 B. ciliata
22 (20)	Leaves 5-7-lobed.		2 B. pseudoficifolia
+	Leaves (5-)7-11-lobed		(23)
23 (22)	Petiole sparsely prickly or unarmed; leaves papery to membranous, margins serrulate-ciliate, with 4-6 teeth per cm.		3 B. bodinieri
+	Petiole densely prickly, leaves subleathery, margins spinose-serrulate, with 2-3 teeth per cm.		4 B. hispida