326 SEDGE FAMILY 



m. Perigynia 1-2, obovate, 4-5 mm. 



long C. Geyeri 



n. Perigynia 3-6, oblong, 2 mm. long C. leptdlea 

 b. Stigmas 2; spike brown, about 1 cm. long; 

 perigynia beaked, often spreading; leaves 

 inrolled, thread-like; stems 3-10 in. high C.redowskydna 

 2. Spikes two or more 



a. Spikes all essentially alike, both pistillate and 

 staminate, but the latter flowers often few 

 or inconspicuous ; stigmas 2 



(1) Spikes crowded in a dense round or ovoid 



head, or if in an oblong spike, the latter 

 usually less than 2 cm. long 



(a) Heads pale 



x. Spikes of the head many; heads 1.5- 

 2.5x1-2 cm. ; perigynia beaked, hid- 

 den by the long pointed scale C. Dougldsii 



y. Spikes 3-12; heads 1-1.5x1 cm.; peri- 

 gynia winged, beaked, longer and 

 broader than the acute scale . C,arthrostdchya 



(b) Heads brown 

 x. Spikes 2-6 



(x) Stems 2-8 in. high; leaves inrolled, 

 thread-like 

 m. Spikes in a roundish head 1 cm. 



wide C. incurva 



n. Spikes in an oblong head 1-1.5 cm. 



x5-8 mm. C. stenophylla 



(y) Stems 8-15 in. high; leaves flat; 



heads 1 cm.x5 cm. C. Bonpldndii 



y. Spikes several-many 

 (x) Perigynia winged 

 m. Heads ovoid 1.5-2 cm.xl-1.5 cm.; 



perigynium longer than the scale C. f estiva 

 n. Heads oblong 1-1.5 cm.x8-10 mm.; 



perigynium and scale about equal C. Hoodii 

 (y) Perigynia nut winged, abruptly 

 short-beaked, hidden by the scale ; 

 heads 1.5-2.5 cm. long C. gaydna 



(2) Spikes more than 5 mm. long, densely 



crowded throughout or at least above. 



