CAREX 127 



rarely scattered, in an oblong to cylindric 



cluster 2-5 cm. long 



(a) Per igy nia winged 



x. Beak nearly as long as body or longer 



(x) Perigynia broadly winged C.siccdta 



(y) Perigynia narrowly winged C. leporina 



y. Beak J^-J^ as long as body ; perigynia 



broadly winged C. festucdcea 



(b) Perigynia not winged, sometimes with 



a ridge-like margin 

 x. Beak 1-2 times longer than body C. stipdta 



y. Beak equalling or shorter than body 



(x) Beak equalling the body C. teretiuscula 



(y) Beak shorter than body 

 m. Leaves 1-3 mm. wide; scales acute 



or pointed C. muriedta 



n. Leaves 2-4 mm. wide ; scales ob- 

 tuse C. Sartwellii 

 ( 3 ) Spikes less than 5 mm. long, sometimes 

 longer in C. deweyana, rarely crowded, 

 mostly widely separated in a narrow 

 cylindric cluster 2-7 cm.x4-8 mm. 



(a) Flower cluster raceme-like, the spikes 



mostly 1-3-flowered, 1.5-5 mm. long; 

 perigynia ovoid, minutely beaked, 

 larger than the scale C. tenella 



(b) Flower cluster of 3-9 distinct 3-15-flow- 



ered spikes 

 x. Perigynia with a beak more than one- 

 half as long to as long as the body 

 (x) Perigynia spreading or reflexed 

 when mature, 2-3 mm. long ; 

 spikes 8-15-flowered C. sterilis 



(y) Perigynia erect, 4-5 mm. long; 



spikes 3-8-flowered C. deweyana 



y. Perigynia 1-2 mm. long, not spreading, 

 with a minute beak less than one-half 

 as long as the body ; spikes 10-20- 

 flowered C. canescens 



b. Terminal spike staminate or in the next often 

 pistillate above and staminate below, the 

 lateral spikes usually pistillate ; stigmas 3 



