cyperAceae. 7§ 



25. pedunculatae. 



73. C. pedunculated. 



26, .MONTANAE. ' 

 Plant not stoloniferous. 74. C. pedieeilata. 



Plants stoloniferous, the stolons sometimes short. 

 Culms, or some of them, longer than the leaves. 



Staminate spikes conspicuous, mostly over 6 mm. long. , 



Plant dark green ; staminate spike very prominent.; perigynia 



' ■ broadly ioval. 75. C. Pennsylvav^i, 



Plant light green; staminate spike shorter; perigynia. oblong. 



76. C. vairifl, 

 , , <■ . Staminate. spikes inconspicuous, mostly less than. 6. mm. long. 



77 r C. ^albicans. 

 Culms,, or most of> them,, much shorter than the leaves. 



Scales^ light green with purple margins,; perigynia oblong. 



. ■ >' : •■'.-.-) .: ,.m,i ,,.) ... 78. C. nigrqiqarginata. 



Scales greeniwith lighter scarious margins ; perigynia ,o,val. 



. ," ; ,79. C. imtbellqta,. 



27. TBIQUETRAE. 



28. PHYLLOSTAOHYAE. 



80. C. pubesceus. 



83. C, leptalea. 



84. C. 



Body of the perigyniuim oblong, its beak flattened. 81. C. TPildtfifflifU. 

 Body of the perigynium globose, its beak subulate. 82. C. Jamesii. 



29. LEpitocfipHALAE.. 

 30. DIOICAE. 



, „ , 31.. ^ULPENTAE. , 



Beak of the perigynium shorter than the body. 85. C. eonjuncta. 



Beak of the perigynium equalling or longer 1 than' the body: ' ' 

 » 86. C. stipata. 



32. MULTIPLORAE. 



Leaves 2 mm. wide or less. ,. 



Perigynia 3-5 mm. long. 87. C. teretyiiscula. 



Perigynia 2-3 mm. long. 88. C. alopecoidea. 

 Leaves 2-6 mm, wide. 



Leaves as long as the culm or longer. 89. C. .vulpinoidea. 



Leaves shorter than the culm. 90. C. xanthocarpa. 



33. MUHLENBERGIANAE. 



Spikes separated or the upper close together; perigynia mostly radiating or 

 reflexed. 

 Leaves 1-3 mm. wide. 



Perigynia : stellately radiating. 91. C. rosea. 



Perigynia refl'exed when mature. 92. C. retroflexa. 



Leaves 5-9 mm. wide. ' 93. C. sparganioides. 



Spikes all aggregated or the lower. separated; perigynia spreading or ascend- 

 ing. 

 Leaf -blades relatively thin and lax, 4-8 mm. wide. 

 ■ . .V . i ■ '" ' '.'t'ff ii... 94. C. oephaloidea. 



Leaf -blades relatively, stiff, 1-4 mm. wide. 



Perigynia 2 mm. long or less, nerveless or faintly few-nerved. 



95. C. cephalophora. 

 Perigynia 3 mm. long, strongly-nerved. 96. C. Muhlenberg ii. 



