114 Karl M. Wiegand and Arthur J. Eames 



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i. Perigynia abruptly beaked, 3-6 mm. long; pistillate spikes 



6-12 mm. thick 102. C. rostrata 132 



i. Perigynia more gradually beaked, 5-10 mm. long; pistillate 



spikes 10-20 mm. thick 102a. C. r., var. utriculata 132 



/. Staminate spike solitary ; scales of the pistillate spikes often rough- 

 awned; plant cespitose. 

 g. Perigynia lanceolate or conic-subulate, slightly inflated, 10-15 

 mm. long; spikes scattered; leaves 9-14 mm. wide, yellowish 



green 103. C. folliculata 132 



g. Perigynia ovoid-lanceolate or ovoid, more inflated and papery; 

 spikes more nearly contiguous; leaves 3-9 (12 in no. 105) mm. 

 wide, green. 

 h. Perigynia 4-8 mm. long; pistillate spikes spreading or droop- 

 ing, the scales rough-awned. 

 i. Teeth 0.5 mm. long or more; perigynia more or less reflexed, 

 slightly inflated, strongly and closely 15-20-ribbed; (spikes 

 drooping). 

 /. Teeth erect or spreading, 0.5-1 mm. long; perigynia 4-5 

 mm. long; beak shorter than the body. 



104. C. Pseudo-Cyperus 132 

 /. Teeth recurved, 1.2-2 mm. long; perigynia 6 mm. long; 



beak equaling or longer than the body.. 105. C. comosa 132 

 i. Teeth 0.5 mm. long or less ; perigynia spreading. 

 ;. Perigynia 15-20-nerved, 6 mm. long, moderately inflated, 

 widely spreading ; spikes subtruncate at base ; staminate 



scales awned 106. C. hystericina 132 



;. Perigynia 8-10-nerved; beak less toothed. 



k. Spikes elongated-cylindrical, 3-7 cm. long, 8-13 mm. 

 thick, tapering and abortively flowered at base ; peri- 

 gynia 5 mm. long, about 8-nerved, moderately inflated; 



staminate scales awnless 107. C. Schweinitzii 133 



k. Spikes cylindrical, 1.5-6 cm. long, 15-20 mm. thick, sub- 

 truncate at base; perigynia 7-8 mm. long, 10-nerved, 

 much inflated ; staminate scales rough-awned. 



108. C. lurida 133 

 h. Perigynia 10-17 mm. long, papery-inflated (less inflated in no. 

 110a) ; pistillate spikes erect or ascending, the scales awned 

 or awnless. 

 i. Perigynia ascending. 



;'. Pistillate spikes oblong, many-flowered, very large and 

 heavy. 

 k. Pistillate spikes approximate, clustered about the sessile 



staminate spike 109. C. lupulina 133 



k. Pistillate spikes scattered, some or all peduncled ; stami- 

 nate spike more conspicuous, usually peduncled ; peri- 

 gynia more spreading 109a. C. I., var. pedimculata 133 



;'. Pistillate spikes globose or short-ovoid, 1-13-flowered. 

 k. Perigynia 5-8 mm. thick, 10-15 mm. long. 



110. C. intumescens 133 

 k. Perigynia 3-5 mm. thick, 12-17 mm. long. 



110a. C. i., var. Femaldii 133 

 i. Perigynia radiating in all directions from a common center ; 



spikes globose 111. C. Grayii 134 



