1	Plant annual, lacking a caudex (3. C. sect. Annui)		(2)
+	Plant perennial with a robust caudex densely clothed in persistent and straw-colored scales		(5)
2 (1)	Plants dwarf, less than 20 cm tall; flowers almost sessile, typically 4-merous; corolla usually less than 10 mm, rarely up to 15 mm.		17 C. hookeri
+	Plants taller; flowers pedicellate, typically 5-merous; corolla usually more than 15 mm		(3)
3 (2)	Calyx covered with red-brown setae, base of setae swollen, black verrucose; calyx lobes obovate- oblong, broadest at middle or above middle; corolla pale yellow or white.		14 C. lichiangensis
+	Calyx villous; calyx lobes sublinear or triangular, broadest below middle; corolla blue or blue-purple		(4)
4 (3)	Leaves glabrous or sparsely puberulent; flowers in dichasia, fascicled at top of stem; calyx lobes linear.		15 C. fasciculatus
+	Leaves hairy; flowers solitary, terminal on top of stem and branches, rarely 3-5-fascicled; calyx lobes triangular.		16 C. inflatus
5 (1)	Calyx with brown-black setae, sometimes mixed with other hairs; corolla lobes suborbicular, broadly ovate, or oblong, as long as or slightly longer than broad (2. C. sect. Cyananthus)		(6)
+	Calyx glabrous or covered with hairs other than brown-black setae; corolla lobes usually oblong, longer than broad (1. C. sect. Stenolobi)		(11)
6 (5)	Calyx covered with brown-black and white setae; stems sparsely arachnoid		(7)
+	Calyx covered with only brown-black setae; stems villous, scaberulose, or sericeous		(8)
7 (6)	Leaf blade cordate to triangular-ovate, base cordate or rounded, margin obviously crenulate.		12 C. cordifolius
+	Leaf blade linear-elliptic, base cuneate, margin entire or sinuous.		13 C. sherriffii
8 (6)	Leaves less than 11 mm.		11 C. microphyllus
+	Leaves more than 10 mm		(9)
9 (8)	Leaf blade usually oblanceolate, spatulate, or obovate, margin with 3-9 obtuse lobes above middle.		8 C. lobatus
+	Leaf blade elliptic or ovate-lanceolate, margin entire or sinuous-crenulate above middle		(10)
10 (9)	Leaves hispidulous on both surfaces; pedicels 12-32 mm; no leaves aggregated below pedicels.		9 C. pedunculatus
+	Leaves adaxially glabrous, abaxially densely sericeous; pedicels 5-12 mm; several leaves aggregated below pedicels, whorl-like.		10 C. sericeus
11 (5)	Flowers several on a stem in racemelike inflorescence; leaves ovate-lanceolate, abaxially densely sericeous; margin strongly recurved.		7 C. longiflorus
+	Flowers solitary and terminal on a stem; leaves rhombic, flabellate, spatulate, or ovate, rarely lanceolate, rarely sericeous, margin spreading or slightly recurved		(12)
12 (11)	Leaves usually rhombic, flabellate, or spatulate, (2-)2.5-4.8(-5.5) mm, base usually truncate or broadly cuneate, obviously petiolate		(13)
+	Leaves usually spatulate, elliptic, ovate, or obovate-lanceolate, (3-)4.5-16 mm, base cuneate or rounded, attenuate into shortly petiolate, or leaves sessile		(14)
13 (12)	Flowers 1.6-2.4 cm; leaves rhombic, base broadly cuneate.		1 C. delavayi
+	Flowers 2.5-4.8 cm; leaves spatulate to rhombic, margins serrate to sinuous-crenulate, rarely entire.		2 C. formosus
14 (12)	Plants densely covered with long yellow-brown appressed hairs except corolla; scales on caudexes 10-15 × ca. 3 mm; corolla 3-4 cm, lobed to 1/3.		4 C. wardii
+	Plants glabrous or covered with other types of hairs than above, leaves adaxially white hirsute or white hispidulous; scales on caudexes much smaller; corolla 2-2.5(-3.8) cm, lobed to middle		(15)
15 (14)	Leaves spatulate, petiole short, narrowly winged, (0.5-)1.3-5 mm.		3 C. macrocalyx
+	Leaves elliptic, ovate, narrowly ovate, or narrowly obovate, sessile or petiole extremely short, less than 1(-1.7) mm		(16)
16 (15)	Leaves shortly petiolate or sessile, elliptic, narrowly elliptic, or oblanceolate, base cuneate; flowers blue or blue-purple.		5 C. incanus
+	Leaves sessile, broadly ovate or obovate-lanceolate, base rounded; flowers yellow or white.		6 C. flavus