62 CYPEEACEAE. 



pressed, little inflated, 3-4 mm. long, and about \ as broad, each tapering to 

 an acute entire orifice. W. S. Rather rare, in low grounds. Sandstones 

 and shales, schists. Sum. 



61. C. crinita Lam. Culms 3-angled, 5-13 dm. tall: leaves not glaucous; 

 sheaths smooth; blades rough-margined, 3-10 mm. wide, the lowest very short 

 and sheathing: staminate spikes 1 or 2, stalked: pistillate spikes 2-6, narrowly 

 cylindric, 2-11 cm. long, 6-12 mm. in diameter, stalked, drooping: scales green, 

 abruptly contracted intp a rough awn, spreading, 2-6 times as long as the peri- 

 gynia: stigmas 2: perigynia broadly obovoid, obtuse, 2-3.5 mm. long, 1-2 mm. 

 thick, nerveless, inflated, the walls thin, each abruptly tipped by a short entire 

 beak. Bather common, in wet places. Sum. 



62. C. Buxbaumii Wahl. Culms slender, stiff, sharp-angled, rough above, 3-9 

 dm. tall: leaves rough; basal sheaths strongly filamentose ; blades erect, 2-4 mm. 

 wide: spikes 2-7, oblong or cylindric, erect, all sessile and close together, or the 

 lowest sometimes distant and short-stalked, 8-40 mm. long, about 8 mm. in 

 diameter, the terminal one staminate at the base or rarely throughout: scales 

 ovate, awn-tipped, black or dark-brown with a green midvein, longer than the 

 perigynia: perigynia elliptic or obovate, flat, ascending, 3-4 mm. long, light- 

 green, faintly few-nerved, beakless, the apex minutely 2-toothed. M. S. 

 Bather rare, in swamps. Limestones, schists, serpentine. Spr. and sum. 



63. C. Shortiana Dewey. Culms slender, rough above, 3-10 dm. tall, usually 

 overtopped by the upper leaves: leaves roughish; blades elongate, 4-8 mm. wide: 

 bracts short, narrow, rarely much exceeding the spikes: spikes 3-7, linear- 

 cylindric, densely many-flowered, 1-3 cm. long, 4-5 mm. in diameter, erect, the 

 lower stalked, uppermost staminate at base: stigmas 3: perigynia dark-brown, 

 compressed, 2-edged, orbicular or obovoid, nerveless, 2 mm. long, ridged at apex, 

 each abruptly minutely beaked, equalling or shorter than its scale, which is 

 hyaline, scarious-margined, ovate or oblong-lanceolate, persistent, the orifice of 

 the perigynium entire or very nearly so. W. On moist banks near Conewago. 

 Sandstones and shales. Spr. and sum. 



64. C. lacustris Willd. Culms smooth, 5-10 dm. tall, purplish-tinged and 

 filamentose at base, the lower sheaths of fertile culms not blade-bearing: leaf- 

 blades elongate, 5-12 mm. wide, usually exceeding the culm: staminate spikes 

 1-5, linear: pistillate spikes 2-5, cylindric, 3-10 cm. long, about 10 mm. in 

 diameter, the upper erect, sessile or nearly so, the lower stalked: scales lanceo- 

 late or oblanceolate, long aristate or acute, purplish-tinged, the lower longer, the 

 upper equalling or shorter than the perigynia : perigynia narrowly ovoid, 6 mm. 

 long, 2.5 mm. wide, firm, scarcely inflated, strongly nerved, ascending, each 

 tapering into a short 2-toothed beak, the teeth usually erect. [C. riparia 

 authors.] S. Bare, in swamps. Schists. Sum. 



65. C. vestita Willd. Strongly stoloniferous. Culms strict and slender, 4-8 

 dm. tall, rough above: leaves not overtopping the culm; blades 3-5 mm. wide: 

 bracts similar, but narrower, short, rough: staminate spike usually solitary, 

 sessile or short-stalked: pistillate spikes 1-5, oblong, 1-2 cm. long, 6^8 mm. in 

 diameter, erect, commonly staminate at the summit, sessile, or the lower ones 

 short-stalked: perigynia ovoid, densely pubescent, less than 2 mm. in diameter, 

 prominently few-ribbed, each tapering gradually into a short conic somewhat 

 2-toothed beak, white-hyaline at orifice, slightly shorter than or equalling the 

 ovate, mostly acute, membranous scales. E. S. Bare, in swamps. Schists, 

 quartzite. Sum. 



66. C. lanuginosa Michx. Culms slender, but usually rather stouter than those 

 of C. lasiocarpa, sharp-angled and rough above. Leaves and the lower bracts 

 elongate; blades not involute, 2-4 mm. wide, sometimes overtopping the culms: 

 staminate spikes 1-3, long-stalked, sometimes pistillate at the base: pistillate 

 spikes 1-3, usually distant, sessile or the lower slender-stalked, cylindric, 5-7 

 mm. in diameter : scales acuminate or aristate. M. S. Bather rare, in swamps. 

 Limestones, schists, serpentine. Sum. 



