1	Female glume awnless (sometimes awned or mucronate); utricle less than 3 mm, brown to reddish brown or pale brown with dense reddish brown spots and lines; style base not thickened or slightly thickened		(2)
+	Female glume aristate; utricle 3.5-10 mm, pale brown to pale green; style base usually thickened		(7)
2 (1)	Female glume awned or mucronate; upper part of utricle hairy		(3)
+	Female glume awnless, glabrous abaxially; utricle glabrous		(5)
3 (2)	Inflorescence branches linear; beak of utricle straight, strongly 2-toothed.		14 C. burttii
+	Inflorescence branches oblong-lanceolate to ovate-triangular; beak of utricle straight, minutely 2-toothed or obliquely truncate		(4)
4 (3)	Inflorescence branches ovate-triangular, single; utricle pale brown with dense brown spots and lines, beak slightly shorter than 1/2 length of utricle; style base slightly thickened.		20 C. continua
+	Inflorescence branches oblong-lanceolate, usually binate; utricle reddish brown, beak ca. 1/2 length of utricle; style base not thickened.		21 C. rafflesiana
5 (2)	Inflorescence branches compact; female glumes and utricles pale brown, pale yellowish green, or pale green, sometimes with scattered brown spots and lines.		19 C. subfilicinoides
+	Inflorescence branches patent and lax; female glumes and utricles brown to reddish brown or pale brown with dense reddish brown spots and lines		(6)
6 (5)	Utricle elliptic or narrowly elliptic, with many fine veins, beak ca. 1/2 length of utricle; inflorescence branches triangular-ovate.		17 C. filicina
+	Utricle ovate-oblong, with several raised veins, beak slightly shorter than 1/2 length of utricle; inflorescence branches elliptic.		18 C. doisutepensis
7 (1)	Male part of spike oblong, 6-7 × 2-3 mm; utricle 5.5-10 mm, beak thin and long, nearly 2 × as long as utricle body; inflorescence branches loosely few spiked; leaf blade 2-2.5 mm.		9 C. commixta
+	Male part of spike oblong-cylindric or cylindric, 5-8 × ca. 1 mm; utricle 3.5-5 mm, beak shorter than or as long as utricle body; inflorescence branches many spiked (only C. tenuipaniculata with few spikes); leaf blade 5-12 mm		(8)
8 (7)	Female glume with excurved or twisting awn, awn 1-2 × as long as glume		(9)
+	Female glume with straight awn, awn shorter than glume		(10)
9 (8)	Inflorescence branches compact; male part longer than or as long as female part of spike; utricle ovate or elliptic, trigonous, slightly inflated, green, pale brown when dried; female glume yellowish brown, 1/3-1/2 length of utricle.		10 C. indica
+	Inflorescence branches lax and outspread; male part 1/5-1/3 length of female part of spike; utricle rhomboid-ovate, trigonous, not inflated, pale green; female glume yellowish white, ca. 1/4 length of utricle.		11 C. indiciformis
10 (8)	Female glume yellowish white, with dense brown spots and lines; inflorescence axes densely hairy; orifice of utricle beak 2-toothed		(11)
+	Female glume brown or pale yellowish green; inflorescence axes slightly hairy or glabrous; orifice of utricle beak obliquely truncate		(12)
11 (10)	Inflorescence branches many spiked; peduncles of inflorescence branches and inflorescence axes rigid; utricle elliptic.		12 C. cruciata
+	Inflorescence branches 3-8-spiked; peduncles of inflorescence branches and inflorescence axes flaccid; utricle narrowly elliptic or oblanceolate.		13 C. tenuipaniculata
12 (10)	Female glume brown, falling off with utricle at maturity, apex emarginate; inflorescence branches lax; utricle narrowly elliptic, ca. 5 mm; ligule of cladoprophyll ca. 2 × as long as body.		15 C. deciduisquama
+	Female glume pale yellowish green, stramineous when dried, persistent, apex rounded or obtuse; inflorescence branches compact; utricle oblong or ovate- oblong, ca. 3.5 mm; ligule of cladoprophyll nearly as long as body.		16 C. stramentitia