1	Ten or more spikes on each branch; leaves flat; perigynium with 2 lateral veins on adaxial surface	2
–	Fewer than 10 spikes on each branch; leaves fan-shaped; perigynium with many raised veins	7
2	Panicle compound, several branched; culms rigid	3
–	Panicle simple, only one terminal branched or 1–2 lateral branched; culms flaccid	6
3	Inflorescence branches paniculate, 10–20 spikes; male part of spikes oblong-cylindrical	C.scaposa
–	Inflorescence branches subcorymbose, a few spikes; male part of spike circular or oblong	4
4	Leaves linear or linear-oblanceolate; perigynium ovate, beak ca. 1/4 length of perigynium	C.liouana
–	Leaves narrowly elliptical to elliptical-linear; perigynium elliptical, beak slightly shorter than 1/2 length of perigynium	5
5	Leaves margin glabrous, scabrid abaxially; petiole glabrous; nutlets ovate	C.adrienii
–	Leaves margin densely ciliate, glabrous on both surfaces or scabrid or densely hairy abaxially; petiole hairy; nutlets elliptical	C.densifimbriata
6	Leaves narrowly elliptical to linear-elliptical, margins densely replicate; male part of spike circular to oblong, 2.5–4 mm long, ca. 3 mm wide; culms loosely hairy	C.lingii
–	Leaves band shape, margins flat; male part of spikes circular-cylindrical, 3–5 mm long, ca. 1 mm wide; culms loosely hairy and then glabrescent	C.ypsilandrifolia
7	Branches single, rarely binate; basal leaf single	C.kucyniakii
–	Branches not only single; basal leaves 1–3 tufted	8
8	Branches binate or ternate. male part of spikes short-cylindrical	C.peliosanthifolia
–	Branches single (binate or ternate). Male part of spikes short-cylindrical or linear-cylindrical	C.qingyuanensis