1	Inflorescence a panicle of racemes or spikes; styles united into a column		(2)
+	Inflorescence a panicle of umbels or heads; styles distinct or none		(10)
2 (1)	Flowers borne in spikes, sessile; leaflets abaxially densely stellate tomentose, tertiary veins indistinct.		1 S. delavayi
+	Flowers borne in racemes, with a distinct pedicel, abaxially glabrous or sparsely stellate pubescent, tertiary veins distinct		(3)
3 (2)	Leaflets 12-16, rarely 7-9		(4)
+	Leaflets 3-9		(6)
4 (3)	Leaflets abaxially stellate pubescent (sometimes very sparsely so on veins), some smaller than others, but never bractlike; lateral veins 8-15 pairs.		2 S. chapana
+	Leaflets abaxially glabrous, some highly reduced and bractlike, lateral veins 5-8 pairs		(5)
5 (4)	Leaves adaxially with tertiary veins impressed in dry material.		3 S. metcalfiana
+	Leaves adaxially with tertiary veins raised in dry material.		4 S. hainanensis
6 (3)	Leaflets abaxially moderately to densely stellate pubescent, margin sparsely serrate, tertiary venation adaxially impressed in dry material, abaxially raised.		5 S. wardii
+	Leaflets abaxially glabrous, margin entire, tertiary venation adaxially not impressed in dry material		(7)
7 (6)	Petiolules to 1(-1.3) cm.		6 S. shweliensis
+	Petiolules longer than 1.5 cm		(8)
8 (7)	Leaflets adaxially shiny, lateral veins 16-22 pairs, diverging from midvein at more than 45° angle		7 S. multinervia
+	Leaflets adaxially not shiny, lateral veins 8-12(-16) pairs, diverging from midvein at less than 45° angle		(9)
9 (8)	Petals and stamens 5; ovary 5-carpellate.		8 S. hoi
+	Petals and stamens 6; ovary 6-carpellate.		9 S. taiwaniana
10 (1)	Styles none, stigmas sessile		(11)
+	Styles distinct, or united into a column		(17)
11 (10)	Inflorescence with stalked, branched trichomes; largest leaflet more than 11.5 cm wide (rarely only ca. 8 cm wide).		10 S. petelotii
+	Inflorescence with stellate trichomes but lacking stalked, branched trichomes; largest leaflet no more than 9 cm wide (rarely to 16 cm in S. elliptica)		(12)
12 (11)	Flowers and fruit in heads, sessile or subsessile.		11 S. pauciflora
+	Flowers and fruit distinctly pedicellate		(13)
13 (12)	Fruit red-brown glandular punctate; disk rounded to flat		(14)
+	Fruit not glandular punctate; disk usually broadly conic to pyramidal		(15)
14 (13)	Ovary 5-carpellate, stigmas 5; calyx obscure, reduced to a line; disk rounded to nearly flat; leaflets subleathery.		12 S. leucantha
+	Ovary (7 or)8- or 9-carpellate, stigmas 7-9; calyx evident, forming a distinct rim; disk flat to slightly depressed; leaflets membranous to papery.		13 S. zhuana
15 (13)	Ovary 5-loculed.		14 S. elliptica
+	Ovary 6-9(or 10)-loculed		(16)
16 (15)	Leaflets 7-9, blade of largest less than 12 cm, secondary veins 4-6 pairs; ovary 6-loculed.		15 S. arboricola
+	Leaflets 5-7, blade of largest 17-35 cm, secondary veins 12-16 pairs; ovary 6-9(or 10)-loculed; inflorescence pseudo-lateral, borne below leaves.		16 S. khasiana
17 (10)	Styles free at least apically, free arms radiating to recurved (appressed at anthesis, but not fused)		(18)
+	Styles completely united into a column		(20)
18 (17)	Flowers long pedicellate, arranged in umbels.		17 S. hypoleucoides
+	Flowers sessile or subsessile (pedicel to 3 mm, but usually obscure), arranged in compact heads		(19)
19 (18)	Leaflets elliptic to slightly ovate, 8-23 × 4-12 cm, base broadly cuneate or rounded; calyx margin entire or subentire.		18 S. chinensis
+	Leaflets lanceolate to elliptic-lanceolate, 12-26 × 3-6 cm, base cuneate; calyx margin with 5 sharp teeth.		19 S. guizhouensis
20 (17)	Inflorescence pseudo-lateral, borne below leaves (at least in fruit)		(21)
+	Inflorescence terminal		(22)
21 (20)	Leaflets 7-9(-12), leathery, petiole 7-10 mm in diam. at base, with a prominent ligule 15-20 mm; ovary 6-carpellate.		34 S. lociana
+	Leaflets 5-7, membranous, petiole 2-4 mm in diam. at base, with a small ligule 2-5 mm; ovary 6-10-carpellate.		35 S. brevipedicellata
22 (20)	Leaflets abaxially stellate pubescent, at least when young (sometimes minute and scattered)		(23)
+	Leaflets abaxially completely glabrous		(30)
23 (22)	Petals stellate pubescent; terminal leaflet often more than 8 cm wide (sometimes narrower in S. hypoleuca)		(24)
+	Petals glabrous; terminal leaflets less than 8 cm wide		(25)
24 (23)	Leaf apically acute; inflorescence stellate pubescent or glabrous, inflorescence with primary axis 15-30(-40) cm.		20 S. hypoleuca
+	Leaf apically acuminate; inflorescence densely ferruginous-brown stellate pubescent (glabrescent), primary axis to ca. 75 cm.		21 S. macrophylla
25 (23)	Secondary and tertiary veins adaxially impressed in dry material		(26)
+	Secondary and tertiary veins adaxially not impressed in dry material		(27)
26 (25)	Leaflets oblong or elliptic to slightly obovate, abaxially densely yellow-brown stellate pubescent; inflorescence rounded, primary axis to 15(-25) cm.		22 S. fengii
+	Leaflets narrowly obovate to oblanceolate, abaxially gray stellate pubescent or sparsely pubescent; inflorescence tall, primary axis 25-40 cm.		23 S. rhododendrifolia
27 (25)	Styles stout, shorter than 1.5 mm in fruit; ovary 5-9(or 10)-carpellate; inflorescence axes light to rusty brown pubescent.		24 S. heptaphylla
+	Styles slender, longer than 1.5 mm in fruit; ovary 5(or 6)-carpellate; inflorescence axes not light to rusty brown pubescent		(28)
28 (27)	Inflorescence compact, primary axis 5-15(-17) cm, gray or brown tomentose; margins of leaflets often sparsely to moderately serrulate.		25 S. bodinieri
+	Inflorescence elongate, primary axis at least 25 cm, densely yellow-brown or ferruginous pubescent; margins of leaflets usually entire, sometimes sparsely serrulate		(29)
29 (28)	Leaflets 7, elliptic, abaxially ferruginous stellate pubescent.		26 S. marlipoensis
+	Leaflets (5-)9-13, ovate to ovate-lanceolate or oblong-lanceolate, abaxially minutely stellate pubescent.		27 S. minutistellata
30 (22)	Leaflets less than 2 cm wide, linear-oblong, abaxially ferruginous pubescent.		28 S. parvifoliolata
+	Leaflets more than 2.5 cm wide		(31)
31 (30)	Leaflets obovate-oblong, broadest in distal half		(32)
+	Leaflets ovate-lanceolate or elliptic, broadest at middle or in basal half		(33)
32 (31)	Leaves with secondary and tertiary veins adaxially impressed in dry material		29 S. glabrescens
+	Leaves with secondary and tertiary veins adaxially not impressed in dry material.		30 S. napuoensis
33 (31)	Leaflets leathery, elliptic, secondary and tertiary veins adaxially impressed in dry material; inflorescence a corymbose panicle, glabrous.		31 S. pes-avis
+	Leaflets papery to subleathery, secondary and tertiary veins adaxially not impressed in dry material; inflorescence paniculate, ± pubescent		(34)
34 (33)	Ovary 5-9(or 10)-carpellate, styles shorter than 1.5 mm.		24 S. heptaphylla
+	Ovary 5-carpellate, styles (1-)1.5-3.5 mm		(35)
35 (34)	Inflorescence compact, primary axis 5-15(-17) cm, gray or brown tomentose.		25 S. bodinieri
+	Inflorescence elongate, primary axis at least (20-)30 cm		(36)
36 (35)	Petals stellate pubescent.		20 S. hypoleuca
+	Petals glabrous		(37)
37 (36)	Leaflets oblong-lanceolate, 20-25 × 5.5-6.5 cm, apex acuminate.		32 S. elata
+	Leaflets oblong-elliptic or elliptic, 11-15 × 5-9 cm, apex abruptly acute.		33 S. insignis