194 CYPERACEAE 
Perigynium lanceolate or 
lan ce-subulate, taper- 
HE in 2 e eak, 
y-nerved. 
Buren teeth re- 
flexed : perigynium 
pm early decidu- 
XXXIII. COLLINSIAE. 
Peri igynium. -teeth not r 
xed : Daa 
ello wish-green. 
Perigynium broader, ab- 
ruptly contracted into 
he beak, ally 
strongly ribbe ea 
one less than 1 
ng. 
Peric inmi -body 
ovoid or globose, 
h ot truncately 
contracted. 
Perigynium coarse- 
ly ribbed or 
an 
obovoid or obconic 
bo 
XXXIV. FOLLICULATAE. 
XXXV. VESICARIAE. 
XXXVI. PSEUDO-CYPEREAE. 
prominent beak. XXXVII. SQUARROSAE. 
Perigynium 1 cm. long 
or longer. XXXVIII. LUPULINAE. 
d s NAE 
I. MU 
Perigynium conspicuously corky-thickened at base, usually widely radiating or re- 
flexed at ma urity. 
Beak S eevee smooth: scales acuminate, deciduous: spikes mostly approxi- 
Body pu perigynium broadly ovate, uneaually bi- 
neus deep-green, many striate at base ven- 
Bod? ot perigynium lanceolate or ovate- oe 
late, plano-convex, light-green, nerveles 
Beak of perigynium serrulate: scales baie 
tis j 
TE stouter, twisted, short, deep- -brownish- 
red: perigynium deep- green, contracted 
n Prud conspicuously white-hyaline at 
th 
Leaf- a E 2.5 mm. wide: spikes 
usually with 9-12 perigynia: perigynium 
perigynium .5-3 mm. long, more ascen 
ng. 
Perigynium not or but little corky-thickened at base, 
spreading or ascendin 
Perigynium nerveless dor euis or 2- or 3-nerved 
scale (excluding awn) much cceeded by body 
of perigynium: sheaths not or but slightly 
thickened at mouth ; he ad vee orbicular. 
Perigynium elliptic-ov vate, narrowed at base. 
pud a middle, with piros raised 
argin 
Perigvnium Droad ovate, broadest at the trun- 
cate-cordate base, and sharp- Pw only to- 
wards the base, flat on inner 
1. C. retroflexa. 
2. C. texensis. 
3. C. rosea. 
4. C. convoluta. 
5. C. radiata. 
6. C. cephalophora. 
1. C. Leavenworth. 
