1	Terminal or all spikes gynaecandrous		(2)
+	Terminal spike male		(5)
2 (1)	All spikes gynaecandrous; female glumes much longer than utricle.		192 C. atrofuscoides
+	Terminal 1 or 2 spikes gynaecandrous; female glumes shorter than or equaling utricle		(3)
3 (2)	Plants without creeping rhizomes.		193 C. viridimarginata
+	Plants with creeping rhizomes		(4)
4 (3)	Upper 1 or 2 spikes gynaecandrous, remaining ones female; utricles dark purple-red, apex abruptly contracted into a short beak.		194 C. nivalis
+	Terminal spike gynaecandrous or merely male, remaining ones female; utricles yellow-green, apex abruptly contracted into a long beak.		195 C. psychrophila
5 (1)	Involucral bracts sheathless.		196 C. neodigyna
+	Involucral bracts sheathing		(6)
6 (5)	Rhizomes neither creeping nor stoloniferous		(7)
+	Rhizomes creeping, emitting stolons		(10)
7 (6)	Leaf blades 3-4 mm wide; utricles narrowly lanceolate, scabrous on upper margins.		197 C. cruenta
+	Leaf blades 1-2.5 mm wide; utricles oblong		(8)
8 (7)	Spikes 7-13.		198 C. gonggaensis
+	Spikes 4-6		(9)
9 (8)	Terminal spike male; female glumes elliptic, obtuse at apex.		199 C. nakaoana
+	Terminal 2 or 3 spikes male; female glumes broadly ovate, acuminate at apex.		200 C. kwangtoushanica
10 (6)	Leaf blades ca. 1 mm wide, involute toward apex		(11)
+	Leaf blades 2-3 mm wide, flat, acuminate at apex		(12)
11 (10)	Lateral female spikes sessile; utricles abruptly contracted into a long beak.		187 C. mucronatiformis
+	Lateral female spikes with peduncles, slender, slightly pendent; utricles abruptly contracted into a short beak or beakless.		188 C. montis-everestii
12 (10)	Utricles broadly elliptic, with rather broad light green to yellowish green margins.		189 C. coriophora
+	Utricles without light green to yellowish green margins		(13)
13 (12)	Female glumes ovate-lanceolate or oblong-lanceolate, 4-5 mm, apex acute.		190 C. atrofusca
+	Female glumes elliptic, 3-3.5 mm, apex obtuse.		191 C. qinghaiensis