46 CYPERACEAE 



20. Obtusatae. 

 Represented by one species. 70. C. obtusata. 



21. NlTIDAE. 

 Represented by one species in our range. 71. C. supina. 



22. RUPBSTBES. 

 Represented by one species. 72. C. rupestris. 



23. FIBMICULMES. 



Represented by one species in our range. 73. C. Geyeri. 



24. FiLIFOLIAE. 



Leaf-blades filiform at base, 0.25-0.5 mm. wide; culms filiform, obtusely triangular, 

 smootliisli: lowest scale rarely awned. 

 Perigynia sharply triangular below, obpyramidal; basal sheaths rarely Qlamentose, 



74. C. elynoides. 

 Perigynia rounded on the angles, obovoid to globose; basal sheaths fllamentose. 



75. C.ftli/olia. 

 Leaf-blades flattened at ba.se, 1.5-2 mm. wide; culms stoutish, sharply triangular, often 



much roughened; lowest scale conspicuously awned. 76. CI. oreocharis. 



25. SCIEPESTAE. 

 Culms phyllopodic, the culm-leaves 6-10; scales concealing perigynia. 



77. C. pseudoscirpoidea. 

 Culms aphyllopodic, the culm-leaves 3-6; scales shorter than perigynia. 



Perigynia lanceolate, flattish, 4 mm. long. 78. C. stenochlaena. 



Perigynia broader, triangular, 3 mm. long or less. 



Scales very minutely hyalin&-margined; perigynia whitish-pubescent. 



79. C. scirpoidea. 

 Scales very broadly hyaline-margined; perigynia yellowish-hirsute. 



80. C scirpiformis. 



26. MONTANAE. 

 Basal spikes absent. 



Long stoloniferous; scales about equalling the perigynia. 81. C. heliophila. 



Without long stolons; scales much shorter than the perigynia. 82. C. Peckii. 

 Basal spikes present. 



Lower bract e.tceeded by the culm, scale-like, hyaline-margined at base. 



83. C umbellala. 

 Lower bract normally exceeding the culm, leaf-like, not hyaline-margined at base. 



Perigynia 2.75 mm. long or less, shallowly bidentate; rootstocks slender. 



84. C dejiexa. 

 Perigynia longer, deeply bidentate; culms densely cespitose. 



85. C. Bossii. 



27. DiGITATAE. 



Basal spikes present; scales abruptly cuspidate. 86. C. pedunculala. 



Basal spikes absent ; scales not abruptly cuspidate. 



Staminate spike 3-6 mm. long; scales obtuse, one-half as long as the perigynia. 



87. C. concinna. 

 Staminate spike 8-22 mm. long; scales acute to acuminate, from little shorter than 

 to exceeding the perigynia. 

 Perigynia loosely pubescent, wider and longer than the scales; staminate spike 



nearly sessile; pistillate spikes few-flowered. 88. C. concinnoides. 



Perigynia appressed-pubescent, narrower and shorter than the scales; staminate 

 spike noticeably peduncled; pistillate spikes many-flowered. 



89. C. Richardsonii. 



28. AU3AE. 



Represented by one species in our range. 90. C. eburnea. 



29. BlCOLORES. 



Mature perigynia whitish, elUpsoid, not fleshy or translucent. 91. C. Hassei. 

 Mature perigynia orange or brownish, broader, fleshy, translucent. 



92. C. aurea. 



30. Paniceae. 

 Beak of the perigynia none or very short. 



Sheaths of the bracts short; plant glaucous; leaf-blades involute; spikes approximate. 



93. C. limda. 

 Sheaths of the bracts long; plant not glaucous; leaf-blades flat; spikes distant. 



Fertile culm-blades 3-5, 2-3.5 mm. wide; perigynia 3.5 mm. long or less; spikes 

 linear. 94. c. tetanica. 



Fertile culm-blades 6-10, 3-7 mm. wide; perigynia longer; spikes oblong or linear- 

 oblong. 95. c. Meadii. 

 Beak of the perigynia straight, prominent. 96. C. vaginata. 



31. Laxiflokae. 



Represented by one species in our range. 97. C blanda. 



32. GRANTTLAREa. 



Plants cespitose; bracts elongate, overtopping the spikes; staminate spike short-stalked. 



98. C. Shriveri. 

 the spik 

 Crawei. 



Plants with long-creeping rootstocks; bracts short, rarely overtopping the spikes; stam- 

 inate spike long-stalked. ' 99. c. " 



