1	Inflorescences terminal, narrowly cylindric thyrses, sharply differentiated from vegetative shoots, cymes subtended by very reduced bracts.		(2)
+	Inflorescences axillary or subterminal, mostly cymes, sometimes compact thyrses or reduced to a solitary flower, all except sometimes the uppermost subtended by normal leaves.		(3)
2 (1)	Thyrses lax; lateral cymes to 5-flowered; calyx clearly 2-lipped; corolla white		12 Caryopteris siccanea
+	Thyrses very dense; lateral cymes more than 5-flowered; calyx deeply 6-lobed; corolla bluish purple		13 Caryopteris bicolor
3 (1)	Inflorescences dense axillary thyrses; fruit globose, ca. 4 as long as calyx		14 Caryopteris paniculata
+	Inflorescences axillary or subterminal cymes, often corymbose, sometimes reduced to 1 flower; fruit usually winged or lobed, to 2 as long as calyx.		(4)
4 (3)	Leaf blade entire or with occasional teeth.		(5)
+	Leaf blade regularly crenate or serrate.		(8)
5 (4)	Leaf blade linear-lanceolate or linear-oblong to narrowly oblanceolate, abaxial veins often darker than rest of leaf surface.		(6)
+	Leaf blade elliptic to subrounded, abaxial veins same color or paler than rest of leaf surface.		(7)
6 (5)	Leaf blade adaxially puberulent; corolla 10-15 mm; ovary glabrous		1 Caryopteris mongholica
+	Leaf blade adaxially glutinous and shiny; corolla 6-8 mm; ovary hairy		2 Caryopteris glutinosa
7 (5)	Leaf blade elliptic to narrowly ovate; corolla whitish to yellow, rarely pale blue		3 Caryopteris forrestii
+	Leaf blade ovate to subrounded; corolla purplish		4 Caryopteris jinshajiangensis
8 (4)	Cymes dense, corymbose, without bracts and bractlets; abaxial corolla lobe fringed to dentate; nutlets winged, glabrous or with subapical tuft of stiff coarse hairs.		(9)
+	Cymes lax, rarely clearly corymbose, with bracts and bractlets; abaxial corolla lobe entire; nutlets not winged, uniformly puberulent.		(11)
9 (8)	Corolla glabrous except for a patch of long lanate hairs on each lobe		7 Caryopteris trichosphaera
+	Corolla uniformly appressed puberulent.		(10)
10 (9)	Leaf blade same color on both surfaces; nutlets with subapical patch of stiff coarse hairs		5 Caryopteris incana
+	Leaf blade distinctly white abaxially; nutlets glabrous		6 Caryopteris tangutica
11 (8)	Cymes more than 5-flowered, branches divaricate; calyx shallowly bowl-shaped, exposing nutlets		11 Caryopteris divaricata
+	Cymes 1-5-flowered, branches not divaricate; calyx campanulate, enclosing nutlets.		(12)
12 (11)	Leaf blade irregularly sharply serrate with 1-3 teeth per side, those subtending cymes subentire; ovary and nutlets with yellow hairs		10 Caryopteris aureoglandulosa
+	Leaf blade, including those subtending cymes, regularly serrate to crenate with 4-10 teeth or lobes per side; ovary and nutlets with white hairs.		(13)
13 (12)	Leaf blade crenate with 4-6 rounded lobes per side; flowers always solitary		8 Caryopteris nepetifolia
+	Leaf blade serrate with 6-10 sharp teeth per side; flowers mostly in (2- or) 3-5-flowered cymes, rarely solitary		9 Caryopteris terniflora