CYPEEACEAE. 

 25. PEDUNCULATAE. 



73. C. pedunculata. 



26. MONTANAE. 

 Plant not stoloniferous. 74. C. pedicellata. 



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 oval. 75. C. Pennsylvanica. 



Plant light green; staminate spike shorter; perigynia oblong. 



76. C. varia. 

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



77. C. albicans. 

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



Scales light green with purple margins; perigynia oblong. 



78. C. nigromarginata. 

 Scales green with lighter scarious margins; perigynia oval. 



79. C. urnbellata. 



27. TRIQUETRAE. 



28. PHYLLOSTACHYAE. 



80. C. pubescens. 



Body of the perigynium oblong, its beak flattened. 81. C. Wildenovii. 

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



29. LEPTOCEPHALAE. 



30. DIOICAE. 



31. VULPINAE. 



83. C. leptalea. 



84. C. exilis. 



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



Beak of the perigynium equalling or longer than the body. 



86. C. stipata. 



32. MULTIFLORAE. 



Leaves 2 mm. wide or less. 



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



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 reflexed 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. 



94. C. cephaloidea. 

 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. Muhlenbergii. 



