220 



CYPERACEAE (SEDGE FAMILY) 



357. C. horm 

 V. invisa. 



elongate-ovate, ascending or rarely spreading, distinctly about 10- 

 nerved on each face; scales laiice-atteiituate or aristate. (C. 

 straminea, var. aperta Boott ; C. tenera Britton, not Dewey.) — 

 Fresh or brackish marshes, commonest near the 

 coast, e. Que. to Del. and la. ; B. C. June-Aug. 

 Fig. 356. — Lower small-spiked (J)-6 mm. long) 

 plants have been separated as var. invisa (W. 

 Boott) Fernald. Fig. 357, 



Var. Richii Fernald. Perigynia 4-5 mm. long, 

 with suhorbicidar bodies abruptly contracted to con- 

 spicuous loosely ascending or spreading tips. (C. 

 tenera, var. Fernald.) — Mass. to D, C. Fig. 358. 



13. C. Bickn611ii Britton. Culms comparatively TerminalTnike 

 stout, 4-9 dm. high, smooth except at summit ; leaves ^q^ perigynium. 

 ascending, rather short and firm, 2-4.5 mm. broad ; 

 infloresconre of 3-7 silvery-brown or greeyiish ovoid, obovoid or subglobose 

 approximate or slightly remote spikes (8-14 mm. long) ; perigynia ascending^ 

 with broadly ovate or suborbi- 

 cidar bodies, the tips becoming 

 conspicuous, broadly wing-mar- 

 gined, when mature becoming 

 almost translucent and about 10- 



nerved on each face. (C. stra- ^^^Ji i^f>'^^ 



minea, var. Crawei Boott.) — Dry ^^^^>^ ffK^M^t 

 or rocky soil. Me. to Man., N. J., jjM^^P' [({lliffll''H 



0., and Ark. — May- July. Fig. i^^-^ VlllMflfii/i 



359. 



14. C. sillcea Olney. Culms 

 slender, stiff, 3-8 dm. high ; leaves 

 erectish, usually glaucous, 2-4.5 

 mm. wide, often becoming involute; 



inflorescence of 3-12 usually remote conic-ovoid and clavate- 

 based whitish spikes (1-1.5 cm. long) ; peHgynia firm 

 and opaque, 4-5 mm. long, 2.2-3 mm. broad, short-beaked, 

 broad-winged, the body distinctly 3-5-nerred on the inner, 

 Q-\2-nerved on the outer face. (C. foenea, var. subu- 

 lonum Gray.) — Sands and rocks 

 near the sea, Gulf of St. Law- 

 rence to N. J. June-Aug. Fig. 

 360. 



15. C. alata Torr. Culms rather 

 stout, smooth except at summit, 



leaves mostly short and harsh, 

 2.5-4.5 mm. wide, the sheath green and strongly nerved 

 nearly or quite to the narrow subchartaceous auricle ; 

 head oblong or ovoid, of 3-8 compact approximate 

 conic-ovoid or subcylindric spikes (8-15 mm. long) ; 

 perigynia appressed-ascending , firm and opaque, broad- 

 winged, very faintly nerved or tierveless, much broader 



than the usually rough-awned scales. 



(C. straminea, var. Bailey.) — Marshes 



and wet woods, N. H. to Mich, and Fla. 



July. Fig. 361. 



16. C. suber6cta (Olney) Britton. Similar ; slender ; the 



3-5 irregularly clustered spikes finally tawny or ferruginous ; 



perigynia ovate, 4-5 mm. long, 2.3-2.8 mm. broad; scales 



lance-ovate, mostly awnless. (C. tenera, var. Olney; C. alata^ 



var. ferruginea Fernald.) — Ont. and 0. to Mich., 111., and la. 



Fig. 362. 

 862. c. suberecta. 17. C festucllcea Schkuhr. Culms stiff, 0.5-1 m. high ; 



359. C. Bicknellii. 



360. C. silicea. 



0.5-1 m. high 



361. C. alata. 



mostly coastal. June, 



