1	Corolla lobe margin usually narrowly involute, valvate or induplicate.		(2)
+	Corolla lobe margin plane, imbricate.		(14)
2 (1)	Calyx and pedicel glabrous		19 Styrax wuyuanensis
+	Calyx and pedicel densely scaly or stellate pubescent.		(3)
3 (2)	Leaf blade abaxially densely covered with silvery gray or brownish glossy scales		20 Styrax argentifolius
+	Leaf blade abaxially glabrous or stellate tomentose.		(4)
4 (3)	Leaf blade abaxially densely stellate tomentose.		(5)
+	Leaf blade abaxially glabrous or sparsely stellate pubescent.		(9)
5 (4)	Petiole 1--3 mm; leaf blade abaxially densely grayish stellate tomentose, tertiary veins reticulate; fruit obovoid, ca. 6 mm in diam.		21 Styrax calvescens
+	Petiole 10--30 mm; leaf blade abaxially densely brown or browish stellate tomentose, tertiary veins subparallel; fruit ovoid-globose, globose, or subglobose, 10--22 mm in diam.		(6)
6 (5)	Calyx teeth ovate-deltoid and ca. 2 mm; leaf blade abaxially densely stellate tomentose but stellate pubescent on veins		22 Styrax chinensis
+	Calyx teeth ± rudimentary, limb undulate, truncate, or subtruncate and less than 2 mm; leaves abaxially stellate tomentose.		(7)
7 (6)	Leaf blade twice or more as long as wide, base cuneate; fruit ovoid-globose		25 Styrax suberifolius
+	Leaf blade less than twice as long as wide, base rounded or broadly cuneate; fruit globose or compressed globose.		(8)
8 (7)	Petiole 2--3 cm; leaf blade thickly leathery, apex shortly acuminate		23 Styrax hainanensis
+	Petiole 1--1.5 cm; leaf blade leathery, apex acuminate		24 Styrax benzoides
9 (4)	Fruit cylindrical to oblique-ovoid or ellipsoid to ellipsoid-ovoid; filaments flexuous.		(10)
+	Fruit subglobose, globose, ovoid, or obovoid; filaments straight.		(11)
10 (9)	Fruit cylindrical to oblique-ovoid, 1.2--3 X 8--16 mm, apex rostrate to shortly pointed; leaf blade elliptic, oblong, or elliptic lanceolate, margin entire or irregularly denticulate		26 Styrax agrestis
+	Fruit ellipsoid to ellipsoid-ovoid, 8--16 X 6--8 mm, apex acute or apiculate; leaf blade ovate, oblong, or ovate-lanceolate, margin serrate or rarely entire		27 Styrax serrulatus
11 (9)	Trees; leaf blade leathery or nearly leathery; inflorescences (3--)5-flowered or more.		(12)
+	Shrubs; leaf blade papery; inflorescences to 5-flowered.		(13)
12 (11)	Inflorescences racemose; fruit 8--15 mm in diam.		28 Styrax confusus
+	Inflorescences paniculate; fruit 5--7 mm in diam.		29 Styrax dasyanthus
13 (11)	Calyx 2.5--3 mm; fruit irregularly rugose		30 Styrax formosanus
+	Calyx 4--5 mm; fruit smooth		31 Styrax faberi
14 (1)	Leaf blade abaxially densely stellate tomentose.		(15)
+	Leaf blade abaxially glabrous or sparsely stellate pubescent.		(21)
15 (14)	Branchlets with a pair of opposite leaves at base; inflorescences a well defined 6--15 cm raceme, sometimes with 1 to 3 lateral racemes from near base.		(16)
+	Leaves never opposite; inflorescences an irregular panicle with cymose branches or if unbranched and racemelike then 6 cm or less (sometimes to 10 cm in S. tonkinensis).		(17)
16 (15)	Petiole forming a broad sheath at base to enclose winter buds; leaf blade subrounded to broadly elliptic		1 Styrax obassis
+	Petiole without a broad sheath at base; leaf blade elliptic to elliptic-oblong		2 Styrax huanus
17 (15)	Seeds densely tuberculate, stellate pubescent; inflorescence a 3--10 cm raceme		3 Styrax tonkinensis
+	Seeds smooth or rugose, glabrous; inflorescences to 6 cm, often paniculate.		(18)
18 (17)	Leaf blade 1--2.5(--4) X 0.7--2(--2.6) cm, margin 2--4 lobed or apically coarsely serrate; calyx 2--3 mm		4 Styrax wilsonii
+	Leaf blade 3.5--8.5(--9.5) X 2--4.5 cm, margin entire or finely serrate to serrulate, never lobed; calyx 4.5--7 mm.		(19)
19 (18)	Bracteoles linear, 6--12 mm; leaf blade adaxially usually rugose; fruit ca. 8 mm in diam.		5 Styrax rugosus
+	Bracteoles subulate, 3--4 mm; leaf blade adaxially not rugose or sometimes slightly rugose when young (adaxially rugose in S. perkinsiae); fruit 10--15 mm in diam.		(20)
20 (19)	Branchlets and abaxial surface of leaves including veins densely brownish stellate tomentose and shortly pubescent; leaf blade elliptic to obovate		6 Styrax limprichtii
+	Branchlets and abaxial surface of leaves densely gray stellate tomentose but not shortly pubescent; leaf blade ovate, ovate-elliptic, or elliptic-lanceolate		7 Styrax perkinsiae
21 (14)	Leaves at least some subopposite, either a pair at base of each new shoot or near apex of branchlets.		(22)
+	Leaves always alternate.		(25)
22 (21)	Leaf blade coarsely serrate to 3--5-lobed; calyx teeth 4--5 mm, lanceolate; stamens alternately differing in length		10 Styrax supaii
+	Leaf blade entire, subentire, denticulate, or serrate; calyx teeth less than 3 mm, deltoid, triangular, or subulate; stamens ± equal in length.		(23)
23 (22)	Inflorescences 8--10-flowered; petiole 7--15 mm		11 Styrax hemsleyanus
+	Inflorescences 1-flowered; petiole less than 7 mm or absent.		(24)
24 (23)	Fruit 2--2.5 cm in diam.; seeds glabrous		12 Styrax macrocarpus
+	Fruit 1--1.2 cm in diam.; seeds sparsely stellate pubescent		13 Styrax zhejiangensis
25 (21)	Fruit densely golden-yellow stellate tomentose; leaf blade sparsely hirsute with both simple and stellate hairs		14 Styrax chrysocarpus
+	Fruit densely gray, gray-yellow, or brownish stellate pubescent; leaf blade glabrous to stellate (mixed with simple hairs in S. roseus).		(26)
26 (25)	Pedicel 2.5--5 cm, equal to or longer than subtended flower.		(27)
+	Pedicel 0.2--1.8 cm, often shorter than subtended flower.		(28)
27 (26)	Pedicel and calyx glabrous or (S. japonicus var. calyconthrix) sparsely stellate pubescent		8 Styrax japonicus
+	Pedicel and calyx densely stellate tomentose		9 Styrax grandiflorus
28 (26)	Seeds with scales; leaves yellowish when dried; filaments slightly flexuous at middle		15 Styrax odoratissimus
+	Seeds glabrous; leaves brownish to dark green when dried; filaments not flexuous.		(29)
29 (28)	Leaf blade base narrowly cuneate; fruit smooth when mature		16 Styrax bashanensis
+	Leaf blade base rounded or broadly cuneate; fruit rugose when mature.		(30)
30 (29)	Leaf blade ovate-lanceolate to oblong; petiole 5--10 mm; calyx yellow tomentose; corolla tube 3--4 mm; fruit obovoid-cylindrical		17 Styrax macranthus
+	Leaf blade elliptic to ovate-elliptic; petiole 3--5 mm; calyx yellow-brown to orange-red and tomentose to shortly pubescent; corolla tube ca. 2 mm; fruit subglobose		18 Styrax roseus