CYPERACEAE. 63 



67. C. lasiocarpa Ehrh. Culms very slender, erect, smooth, obtusely angled, 

 5-9 dm. long. Leaf-blades very narrow, involute, 2 mm. wide or less, rough- 

 margined, not overtopping the culm: lower bracts similar to the leaves, upper 

 bracts filiform: staminate spikes 1-3, commonly 2, stalked: pistillate spikes 

 1-3, cylrndric, 1-2.5 cm. long, about 6 mm. in diameter, erect, sessile or the 

 lower distant and short-peduncled: scales ovate, membranous, acute or short- 

 awned, shorter than or equalling the perigynia: perigynia green, ascending, oval- 

 ovoid, densely pubescent, faintly nerved, about 2 mm. in diameter, each tapering 

 into a short 2-toothed beak. [C. filiformis authors. Not L.] — M. Eare, in 

 swamps. — Limestones. — Sum. 



68. C. trichocarpa INIuhl. Culms usually 6-8 dm. tall, smooth below, very rough 

 above: leaf -blades elongate, rough-margined, 3-6 mm. wide: staminate spikes 

 2-6, long-stalked : pistillate spikes eylindrie, densely flowered except at the base, 

 2-lb cm. long, 1-1.6 cm. in diameter, the upper sessile or nearly so and erect, 

 the lower slender-stalked: scales hyaline, acute to aristate: stigmas 3: peri- 

 gynia ovoid, pubescent in our form, many-ribbed, 8-10 mm. long, 3-4 mm. wide, 

 each tapering into a long conspicuously 2-toothed beak, the teeth somewhat 

 spreading. — M. Rare, in wet meadows near Lancaster. — Limestones. — Sum, 



69. C. folliculata L. Yellow or yellowish. Culms erect or reclining, 4—10 dm. 

 long: leaf -blades 4-16 mm. wide: pistillate spikes 2-5, usually distant, all 

 except the uppermost slender-stalked, the lower often nodding: bracts commonly 

 overtopping the spikes : stigmas 3 : perigynia lanceolate, slightly inflated, rather 

 prominently many-nerved, 12-16 mm. long, about 3 mm. in diameter near the 

 base, each tapering from below the middle into a slender 2-toothed beak, longer 

 than the awned scarious-margined persistent scale, the teeth nearly erect. — 

 Rather rare, in swamps. — Sum. 



70. C. monile Tuckerm. Culms 4-9 dm. tall, not spongy at base, acutely angled 

 and very rough above: leaves and bracts narrow and elongate; blades 3-6 mm. 

 wide: staminate spikes 1-4, usually 2 or 3, slender-stalked: pistillate spikes 1-3, 

 2.5-25 cm. long, 7 mm. wide, eylindrie: stigmas 3: perigynia inflated, broadly 

 ovoid, 5-8 mm. long, 8-10-nerved, each abruptly contracted into a slender 2- 

 toothed smooth beak, longer than the scale. — S. Eare, in swamps. — Schists. 

 — Sum. 



71. C. buILata Schk. Culms slender, 3-9 dm. high, roughish above: leaves 

 and bracts very narrow and elongate; blades rarely more than 4 mm. wide, 

 rough-margined: staminate spikes mostly 2, long-stalked: pistillate spikes 1-3, 

 light-green, oblong or oblong-cylindric, many-flowered, 2-5 cm. long, 9-18 mm. 

 in diameter: stigmas 3: perigynia much inflated, ovoid. 5-8 mm. long, each 

 abruptly contracted into a slender rough 2-toothed beak, dull or shining, strongly 

 nerved, longer than the acuminate to obtusish scale. — S. Eare, in s-wamps. 



— Spr. 



72. C. lurida Wahl. Culms slender, 2-9 dm. tall : leaves elongate, rough ; blades 

 4-7 mm. wide: staminate spike short- or long-stalked: pistillate spikes 1-4, 

 mostly oblong-cylindric, 2-6 cm. long, 14-20 mm. in diameter, the upper sessile, 

 the lower peduncled: perigynia inflated, ovoid, each tapering into a long slender 

 beak, ascending or the lower spreading, 6-9 mm. long, thin, yellowish-green, 

 conspicuously ribbed, longer than the rough-awned scale. [C. tentaculata 

 Muhl.] — Common, in swamps. — Sum. 



73. C. hystricina Muhl. Culms 3-8 dm. tall: leaf -blades 3-8 mm. wide: 

 staminate spike slender-stalked: pistillate spikes 1-4, oblong-cylindric, dense, 

 1-6 cm. long, 10-14 mm. in diameter, the lower slender-stalked and drooping: 

 stigmas 3: perigynia ascending, somewhat inflated, ovoid-conic, 5-7 mm. long, 

 strongly 15-20-nerved, each tapering into a slender 2-toothed beak, equalling or 

 the upper longer than the narrow rough-awned scales. — Common, in swamps. 



— Sum. 



