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Cyperaceae 87 
F.  Perigynia shorter than the scales. W. 
C. pansa, Bail. 
FF. Perigynia equaling or exceeding the scales. 
G.. Perigynia 2—3 times as long as the scales, rough-beaked;_ perigynium- 
beak 1—2 times as long as the body. W. C. E. 
C. stipate, Muhl. 
GG.  Perigynia I—11/ times as long as the scales, rough on the ridges 
above; perigynium-beak long or short. 
H.  Bracts small or none. 
I. Inflorescence dense, spike-like, dark-brown. E. (C. diandra.) 
C. teretiuscula Good. 
II. Inflorescence loose, somewhat panicle-like, light-brown. W. C. E. 
_ (C. teretiuscula ampla; C. diandra ramosa.) 
C. teretiuscula praing Brit. 
HH. Bracts setaceous, exceeding the spikes. W. (C. vicaria costata.) 
C. vicaria Bail. 
GROWP.3 
A. Spikes greenish; pistillate scales white, equaling or shorter than the perigynia. E. 
C. tenella Schk. 
AA. Spikes yellow or brown; pistillate scales various in color and length. 
B. Bracts longer than their spikes; pistillate scales acute or cuspidate. 
C. Scales shorter than the perigynia, ovate; heads |—4 cm. long; perigynia 
rough on the ridges above. W. (C. vicaria costata.) 
C. vicaria Bail. 
CC. Scales equaling the perigynia, lanceolate; heads 4—12 cm. long; perigynia 
smooth. E. C. vulpinoidea Michx. 
BB.  Bracts shorter than their spikes or occasionally the lower one a little longer. 
D. Scales shorter than the perigynia, blunt or obtuse. ~ C. 
C. jonesii Bail. 
DD. Scales equaling or exceeding the perigynia. 
E.  Pistillate scales acute or cuspidate; perigynia rough on the ridges above. E. 
(C. marcida debilis.) 
C. marcida Boott 
EE. Pistillate scales blunt or obtuse; perigynia hairy on the ridges above. E. 
j CG usta Bail. 
GROUP 14 
A.  Bracts subtending the head leaf-like, 2 or more times as long as the head. C. E. 
C. athrostachya O!ln. 
AA. Bracts subtending the head often scale-like, not exceeding the head. 
B. Perigynia not wing-margined, rough above. W. C. E. (C. canescens ore- 
gana. ) C. arcta Boott 
BB. Perigynia wing-margined. 
C. Spikes in an oval or roundish head; perigynia rough on the ridges above. 
D.  Perigynia about as long as wide. E. 
C. festucacea brevior Fer. 
DD. Perigynia about twice as long as wide. 
E. Stem roughish above; pistillate scales blunt or acute. C. 
C. specifica Bail. 
EE. Stem smooth; pistillate scales acuminate or cuspidate. W. 
C. scoparia, Schk. 
