1	Utricles leathery, with winglike thickened margins, scabrous above, veins numerous on both faces, conspicuously raised.		503 C. curaica
+	Utricles membranous, with winged margins (at least above), veins not conspicuously raised		(2)
2 (1)	Utricles winged on margins above		(3)
+	Utricles narrowly winged on margins		(4)
3 (2)	Utricles ovate or oblong-ovate, sparsely pilose on both faces, rather densely so above, and usually verruculose.		493 C. pallida
+	Utricles obovate-oblong, distally verruculose and sparsely hirsute on both faces.		494 C. maorshanica
4 (2)	Utricles pubescent and verruculose, ovate-lanceolate or lanceolate		(5)
+	Utricles glabrous, not verruculose, ovate or elliptic-ovate		(6)
5 (4)	Leaf blades 2.5-3.5 mm wide; utricles 3.5-4.5 mm, pubescent on both faces, sometimes sparsely long puberulent at base.		495 C. dailingensis
+	Leaf blades 1.5-2 mm wide; utricles 5.5-6.5 mm, verruculose and sparsely hirsute on both faces above.		496 C. laricetorum
6 (4)	Utricles ovate to broadly ovate, spongy.		497 C. lithophila
+	Utricles elliptic-ovate or ovate-lanceolate, not spongy		(7)
7 (6)	Spikes usually unisexual; plants dioecious (rarely monoecious); utricles usually sparsely ferruginous dotted.		498 C. unisexualis
+	Spikes usually androgynous, rarely unisexual; plants monoecious; utricles not ferruginous dotted		(8)
8 (7)	Utricles 2-toothed at orifice		(9)
+	Utricles obliquely truncate at orifice, deeply cleft to middle or 2-toothed abaxially		(10)
9 (8)	Utricles gradually attenuate into a long beak; creeping rhizome subterete; plants of forests or sandy beaches.		499 C. yamatsutana
+	Utricles abruptly constricted into a short beak; creeping rhizome trigonous; plants of swamps.		500 C. pseudocuraica
10 (8)	Female glumes oblong, ca. 4 mm, apex acuminate.		501 C. jiaodongensis
+	Female glumes broadly ovate or suborbicular, 2-2.2 mm, apex obtuse.		502 C. paracuraica