62 CYPERACEAE. 



pressed, little inflated, 3-4 mm. long, and about i 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: staniinate spikes 1 or 2, stalked: pistillate spikes 2-o, narrowly 

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

 abruptly contracted into 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. — Rather 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 filameutose ; 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. 

 Rather 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, liuear- 

 cylindrie, 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. Rare, 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 staniinate 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. Rare, in swamps. — Schists, 

 quart zite. ■ — 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. Rather rare, in swamps. 

 — Limestones, schists, serpentine. — Sum. 



