i8o 



CYPERACEAE 



Tips of perigynia appressed or ascending; spikes 



7-10 mm. long. 

 Tips of perigynia widely spreading or recurved; 

 spikes 4-8 mm. long. 

 Inflorescence dense, oblong; culm stiff, 



stoutish. 

 Inflorescence loose, elongate; culm weak, 

 slender. 

 Perigynia ovate-lanceolate or broader, at most twice 

 as long as broad. 



a. Perigynia strongly exceeding scales, or if nearly 



equalled by them much wider. 

 Perigynia narrowly to broadly ovate, 3-4 mm. 

 long, the tips not appressed. 

 Perigynia brownish; spikes closely aggregate'. ], 



rounded at base. 

 Perigynia green; spikes contiguous to widely 

 separate, usually clavate at base. 

 Leaves 2 mm. wide or less. 

 Leaves 2.5-6 mm. (averaging 4 mm.) 

 wide. 

 Perigynia ovate to reniform, 4 mm. or more long, 

 if shorter with closely appressed tips. 

 Perigynia spreading-ascending; spikes green 

 or brownish. 

 Spikes approximate or scattered, the head 

 stiff. 

 Perigynia 4-4.7 mm. long, thickish, 

 nerveless or obscurely nerved on 

 inner surface. 

 Perigynia 4.7-6.7 mm. long, very 

 thin, prominently about 10-nerved 

 on inner fai e. 

 Spikes in moniliform flexuous head; scales 

 long-pointed. 

 Perigynia closely appressed, or if somewhat 

 spreading-ascending, the spikes whitish 

 or silvery green. 

 Spikes approximate, the head stiff. 



Scales long acuminate or aristate; 



achenes stipital 

 Scales obtuse, or acutish; achenes 

 nearly sessile. 

 Spikes in moniliform flexuous head. 



b. Scales very slightly shorter or slightly longer than 



perigynia and concealing them. 

 Perigynia nerveless on inner face or faintly 



nerved. 

 Perigynia strongly nerved on inner face. 

 11. Phyllostachvae. 



Body of perigynia oblong; pistillate flowers usually 3-10. 



36. C. tribuloides. 



37. C. cristatella. 



38. C. projeda. 



39. C. Bebbii. 



40. C. straminea. 



4 1 . C. normalis. 



42. C. feslui 



43. C. Bicktit 



44. C. hormathodes. 



45. C. alata. 



46. C. albolulescens. 



47. C. silicea. 



48. C. aenea. 



49. C. foenea. 



50. C. Willdenovii. 



