1	Style conspicuously clavate.		(2)
+	Style cylindrical or slightly expanded at apex, not clavate.		(6)
2 (1)	Deciduous shrub; leaves lanceolate to elliptic, rarely narrowly elliptic, veins (2 or)3(or 4).		13 Cornus quinquenervis
+	Deciduous tree; leaves elliptic or ovate-elliptic to broadly ovate, veins (3 or)4(or 5) or 5–8.		(3)
3 (2)	Leaf veins 5–8.		9 Cornus macrophylla
+	Leaf veins (3 or)4(or 5).		(4)
4 (3)	Bark light brown; leaf base rounded, rarely oblique; flowers smaller, ca. 5.2 mm in diam.		6 Cornus coreana
+	Bark dark gray or dark brown; leaf base cuneate to broadly cuneate, often oblique; flowers 7–9.5 mm in diam.		(5)
5 (4)	Abaxial surface of leaves grayish green, pubescent with fine, appressed trichomes, veins 4; petiole 1.2–2.2 cm; inflorescences loose, branches spreading, often arched toward center; calyx teeth longer than disk.		8 Cornus koehneana
+	Abaxial surface of leaves light green, pubescent with thick appressed trichomes, scabrous, veins (3 or)4 or 5; petiole (0.8–)3.5 cm; inflorescences dense, compact, branches straight, rarely arched; calyx teeth equal to disk.		16 Cornus walteri
6 (1)	Shrub, spreading; fruit creamy white or light blue at maturity; stone of fruit laterally compressed.		3 Cornus alba
+	Shrub or tree; fruit bluish black or black at maturity; stone of fruit not laterally compressed.		(7)
7 (6)	Leaves leathery; stigma smaller than or subequaling style in diam.		(8)
+	Leaves papery; stigma obviously larger than style, rarely smaller than style in diam.		(9)
8 (7)	Leaves broadly elliptic, lateral veins 3(or 4), conspicuous, smaller veins conspicuous; flowers ca. 9 mm in diam.		10 Cornus oligophlebia
+	Leaves elliptic, lateral veins 4 or 5, inconspicuous, smaller veins obscure; flowers ca. 7 mm in diam.		4 Cornus austrosinensis
9 (7)	Leaf veins 3; flowers ca. 4.5 mm in diam.; stigma smaller than or equaling style in diam., punctiform.		12 Cornus parviflora
+	Leaf veins (2 or)3–8(or 9); flowers 7–9 mm in diam.; stigma broader than style, not punctiform.		(10)
10 (9)	Abaxial surface of leaves conspicuously pubescent with ± curly or non-curly soft, raised trichomes (trichomes Y-shaped, V-shaped, or pseudofiliform).		(11)
+	Abaxial surface of leaves conspicuously pubescent with short, appressed trichomes, without raised trichomes except sometimes in axils of veins.		(13)
11 (10)	Lateral veins thin, tertiary veins inconspicuous.		5 Cornus bretschneideri
+	Lateral veins thick, tertiary veins conspicuous.		(12)
12 (11)	Veins 5–7, with dense yellowish trichomes; inflorescences loose corymbose cymes, nearly glabrous at anthesis; branches of inflorescences arched inward; flowers sessile or shortly pedicellate, pedicel thick, to 2 mm.		15 Cornus ulotricha
+	Veins 5–8(or 9); both veins and interveinal areas of abaxial surface with dense yellowish, grayish, or brown trichomes; inflorescences corymbose or paniculate cymes, densely pubescent at anthesis; branches of inflorescences straight; flowers pedicellate, pedicel slender, 0.5–6 mm.		14 Cornus schindleri
13 (10)	Leaf veins 3 or 4(or 5).		17 Cornus wilsoniana
+	Leaf veins (5 or)6–8(or 9).		(14)
14 (13)	Leaves 6–17 cm; inflorescences loose, paniculate or corymbose cymes; filaments thick, equaling or slightly exceeding petals; style slightly thickened at apex, appearing subclavate.		9 Cornus macrophylla
+	Leaves 4.5–12 cm; inflorescences compact, convex corymbose cymes; filaments slender, longer than petals; style cylindrical, not subclavate.		(15)
15 (14)	Old branches light yellow; abaxial surface of leaves grayish white, inconspicuously papillate; small veins inconspicuous.		5 Cornus bretschneideri
+	Old branches red, reddish brown, purplish red, or brown; abaxial surface of leaves grayish green, conspicuously papillate; small veins conspicuous.		(16)
16 (15)	Abaxial surface of leaves with blackish streaks; flowers white.		11 Cornus papillosa
+	Abaxial surface of leaves without blackish streaks; flowers white or yellowish.		7 Cornus hemsleyi