226 



CYPERACEAE (SEDGE FAMILY) 



395. C. rosea. 



41. C. r5sea Schkuhr. Always slender and weak, erect, 2-7 dm. high, 

 cuhns exceeding the narrow (1.5-8 nun. broad) leaves ; spikes 3-8, 6-15-^oice?'ed, 

 the rippermost ayyroyated, the others O.b-l.b cm. apart, the lowest 

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

 convex, shiiyng, 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 ichite scale. — Open dry 

 woods, N. S. to JNIan., and south w. May-July. Fig. 395. 



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

 sometimes almost capillary ; spikes 2-5, scattered, 

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

 woods, e. Que. to Ont., and south w. ; 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 396. 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. texensis (Torr.) Fernald. Spikes 3-5; perigynium lance- 

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

 Bailey.) — Ky. to Mo., and southw. 



43. C. muricXta 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, 

 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 898. C. Muhlenbergii. 

 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. enervis Boott. Ferigynium nearly or entirely 

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

 southw. 



45. C. cephal6phora Muhl. Strict but soft, 

 2-7 dm. high; leaves 2—1.5 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 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. l-o (iin. high ; leaves 1-3 mm. wide; bead 0.7-1.5 cm. long; 

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

 cephnlophora, var. angnntifolia Boott.) — Damp woods and banks, Ont. to Ky , 

 Fla.,andTex. Mav,'-Iune. Fig. 400. 



47. C. sparganioides Muhl. Culm 4-10 dm. high; leaves veiy broad 



397. C. muricata. 



899. C. cephalophora. 



400. C. Leaven 

 wortbii. 



