112 Karl M. Wiegand and Arthur J. Eames 



page 

 o. Perigynia with a narrow and sharp, more beak- 

 like, straight or only slightly oblique, apex; 

 spikes alternately flowered, not crowded, the 

 staminate spike conspicuous ; culms smooth or 

 rarely slightly erose ; bracts usually exceeding 

 the culm; basal leaves often broad. 



77. C. anceps 127 

 n. Perigynia obscurely 15-21-nerved, ellipsoidal, the 

 tip slender and straight or slightly oblique, rather 

 abrupt; culms retrorse-scabrous on the angles, 

 rarely almost smooth ; foliage deep green ; bracts 

 generally surpassing the culm.. 78. C. leptonervia 127 

 k. Perigynia rounded at base or at least not stipitate, 

 obtuse at apex; spikes remote. 

 /. Perigynia with 12-24 nerves. 



;». Plant stoloniferous ; spikes loosely flowered; peri- 

 gynia inconspicuously nerved. 

 n. Lower sheaths purple, mostly bladeless ; stolons 

 superficial ; plants of rich humus in woodlands. 



80. C. Woodii 128 

 n. Lower sheaths pale, mostly blade-bearing ; stolons 



deep-seated; plants of springy, marly places. 



81. C. tetanica 128 

 m. Plant cespitose ; spikes densely flowered ; perigynia 



conspicuously nerved. 

 n. Perigynia plump-ovoid, 1.5-2 mm. in diam. 



82. C. granulans 128 

 m. Perigynia oblong, slightly more pointed, less 

 inflated, 1-1.3 mm. in diam. 



82a. C. g., var. Haleana 128 

 /. Perigynia with 27-50 nerves, oblong to elliptic-ovoid; 

 plant cespitose; spikes densely flowered. 

 in. Leaves green ; perigynia 4.5-5 mm. long ; larger 



spikes 5-12-flowered 83. C. grisea 128 



m. Leaves very glaucous, firmer ; perigynia 3-4 mm. 

 long; larger spikes 15-25-flowered. 



84. C. glaucodea 129 

 i. Leaves capillary ; pistillate spikes clustered at summit of stem, 

 and most of them overtopping the minute staminate spike. 



85. C. ebnrnea 129 

 g. Spikes (0.5-8 cm. long) drooping, or if erect the terminal one 

 partly pistillate ; perigynia 5-18-nerved, glabrous, lustrous, apex 

 straight. 

 h. Terminal spike wholly staminate; pistillate spikes drooping; 

 perigynia very acute or beaked; (sheaths glabrous). 

 i. Spikes 0.5-1.5 cm. long; scales broad and very obtuse; peri- 

 gynia 2-3 (3.5) mm. long; leaves 2 mm. wide; basal 



sheaths pale 86. C. capillaris 129 



i. Spikes 2-6 cm. long ; scales oblong or ovate-lanceolate, sub- 

 acute ; perigynia 3-5 mm. long ; leaves 3-10 mm. wide ; 

 basal sheaths purple. 

 /. Broadest basal leaves 3-5 mm. wide ; perigynia much longer 



than the scales (5 mm. long).. 88. C. debilis, var. Rudgei 129 

 ;'. Broadest basal leaves 5-10 mm. wide ; perigynia slightly 



exceeding the scales (3-4 mm. long) 87. C. arctata 129 



