226 



CYPERACEAE (SEDGE FAMILY) 



895. C. rosea. 



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

 culins exceeding the narrow (1.5-3 mm. broad) leaves ; spikes 3-8, ft-lo-flowered, 

 the uppermost aggregated, the others 0.5-2.5 c. apart, 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 ichitc scale. Open dry 

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



Var. radiata Dewey. Much more slender, the loose culms 

 sometimes almost capillary ; spikes 2-5, scattered. 

 2- 4-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 3-8, mostly aggregated, the lower 1 or 2 slightly 

 separated and commonly subtended by a conspicuous bract, often 896. C. retroflexa. 

 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. texnsis (Torr.) Fernald. Spikes 3-5 ; perigynium lance- 

 ovoid or lance-subulate. (<7. rosea, var. Torr. C. texensis 

 Bailey.) Ky. to Mo., and southw. 



43. C. MUKicXTA 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. Muhlenb6rgii 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 

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

 gynium nearly circular, very strongly nerved on both faces, 

 broader than the rough-cusped scale and about as long. 

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

 FIG. 398. Var. EXERVIS Boott. Perigynium nearly or entirely 

 nerveless. (Var. xalapensis Britton.) Mass, to Neb., and 

 southw. 



45. C. cepha!6phora Muhl. Strict but soft, 

 2-7 dm. high ; leaves 2-4.5 mm. wide ; head 

 small. 0.7-1.8 mm. long, globular or very short- 

 cylindric, never interrupted, the lower 1 or 2 spikes usually bearing 

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

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

 scale. Dry woods and knolls, Me. to Ont, and southw. May- 400. c. Leaven 

 July. FIG. 399. , worthii. 



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. 

 cephalophora, var. angustifolia Boott. ) Damp woods and banks, Ont. to Ky , 

 Fla., and Tex. May, June. FIG. 400. 



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



C. MnhlenbergiL 



899. C. cephalophora. 



