226 



CYPERACEAE (SEDGE FAMILY) 



395. C. rosea. 



C. retroflexa 



41. C. rbsea Schkuhr. Always slender and weak, erect, 2-7 dm. high, 

 culms exceeding the narrow (1.5-3 mm. broad) leaves ; spikes 3-8, Q-lb-Jlvwered, 

 the uppermost aggregated, the. others O.o-'2.!S cm. cqjart, the lowest 

 usually with a setaceous bract; perigynium lance-ovoid, plano- 

 convex, shining, nerveless, rough on the edges above, with a flat 

 bidentate beak, perfectly squarrose, very green, 2.5-4 mm. long, 

 about twice longer than the translucent white scale. — Open dry 

 woods, N. S. to Man., and southw. May-July. Fig. 395. 



A^ar. radiata Dewey. Much more slender, the loose culms 

 sometimes almost capillary; spikes 2-6, scattered, 

 2-i-flowered ; perigynium mostly narrower. — Rich 

 woods, e. Que. to Ont., and southw.; commonest 

 in the Alleghenies. 



Var. minor Boott. Erect, very slender ; spikes 

 3-10-flowered ; perigynia ascending. — Local, s. 

 Me. to Mich. 



42. C. retroflexa Muhl. Similar; stiff, 1-6 dm. 

 high ;' spikes 8-8, mostly aggregated, the lower 1 or 2 slightly 

 separated and commonly subtended by a conspicuous bract, often 

 brownish; perigynium ovoid, smooth throughout, very promi- 

 nently corky and swollen at the base, at maturity widely spread- 

 ing ; scales brownish and sharp, at length deciduous. (C. rosea, 

 var. Torr.)— Dry open woods, Mass. to Ont. and Tex. May, 

 June. Fig, 396. 



Var. tex6nsis (Torr.) Fern aid. Spikes 3-5 ; perigynium lance- 

 ovoid or lance-subulate. (C. rosea, var. Torr. • C. texensis 

 Bailey.) — Ky. to Mo., and southw. 



43. C. MURiclTA L. Culm 1.5-8 dm. high, rough, longer than 

 the narrow leaves ; spikes 5-10, variously disposed, but usually 

 some of them scattered, frequently all aggre- 

 gated, rarely tawny; perigynium heavy, ovate, 

 897. C.muricata. 4-6 mm. long, shining, nerveless, the long beak 

 minutely rough, spreading, a little longer than 

 the sharp green or brownish scale. — Dry fields, local, s. Me. 

 to Va. and O. (Nat. from Eu.) Fig. 397. 



44. C. Muhlenbergii Schkuhr. Plant very stiff through- 

 out, pale, growing in small tufts, 2.5-8 dm. high ; culms much 

 prolonged beyond the few narrow (2.5-4 mm. broad) and at 

 length"^ plicate or involute leaves; head 1.5-4 cm. long, the 89S. C. Muhlenbergii 

 individual spikes clearly defined; spikes globular, 3-10 ; peri- , ,, , 



gynium nearly circular, very strongly nerved on both taces, 

 broader than the rough-cusned scale and about as long. — 

 Open sterile soils ; s. Me. to Ont. , and southw. June, July. 

 * Fig. 398. Var. enervis Boott. Perigynium nearly or entirely 

 nerveless. (Var. xalapensis Britton.) —Mass. to Keb., and 

 southw. 



45. C. cephal6phora Muhl. Strict but soft, 

 ,„„ ^ t, 1 V 2-7 dm. hi2:h : leaves 2-4.5 mm. wide; head 



899. C. cephalophora. 'JJ^^/_{^ ;,„,. j^^g^ ^^.^ular or very short- 



cylindric, never intermixed, the lower 1 or 2 spikes usually bearmg 

 a very setaceous short bract; perigynium elliptic-ovate, about 

 2 mni. long, slightly longer than the acute or rough-cusped 

 scale. —Dry woods and knolls. Me. to Ont., and southw. May- 

 July. Fig. 399. ,. , •, . 



46. C. Leavenw6rthii Dewey. In habit resembling the last, 



usually more lax, 1-5 dm. high ; leaves 1-3 mm. wide ; head 0.7-1.5 cm. long ; 

 perigynia cordate-deltoid, exceeding the acutish rarely cuspidate scale. (C. 

 cepha'lophora, var. angustifolia Boott.) — Damp woods and banks, Ont. to K} , 

 Fla., and Tex. May, June. Fig. 400. , . , , , ^ 



47. C. sparganioides MuhL Culm 4-10 dm. high; leaves very broad 



