220 



CYPERACEAE (SEDGE l^AMILY) 



357. 0. hO[-m., 

 V. invisa. 



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

 nerved on each face; scales lance-attentuate or aristate. (C. 

 straminea. Tar. uperta 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 (5-8 mm. long) 

 plants have been separated as var. intisa (W. 

 Boott) Fernald. Fig. 357. 



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

 with suhorbicular bodies abruptly contracted to con- 

 spicuous loosely ascending or spreading tips. (O. 

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



13. C. BicknfiUii Britton. Culms comparatively 

 stout, 4-9 dm. high, smooth except at sumnrit ; leaves and perigynium. 

 ather short and firm, 2-4.5 mm. broad ; 



858. C. horm , 



* V. Richii. 

 TeriuiDal spilie 



359. C. BiolcnellU. 



ascending, rather i 



inflorescence of 3-7 silvery-brown or greenish ovoid, obovoid or subglobose 

 approximate or slightly remote spikes (8-1-1 mm. long) ; perigynia ascending, 



trith broadly ovate or suborbl- 



ntlar bodies, the tips becoming 



conspicuous, broadly viing-mar- 



gined, when mature becoming 



almost translucent and about 10- 



nerved on each face. (C. stra- 

 minea, var. Craioei Boott.) — Dry 



or rocky soil. Me. to Man., N. J., 



0., and Ark. — May-July. Fig. 



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 clavatC' 

 based whitish spil-es (1-1.5 cm. long) ; perigynia firm 

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

 broad-winged, the body distinctly S-b-nerved on the inner, 

 Q-\2-nei-ved 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. al^ta Torr. Culms rather 

 stout, smooth except at summit, 



0.5-1 m. high ; leaves mostly short and harsh, 

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

 nearly or quite to tbe 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 nerveless, 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. 

 3-5 irregularly clustered spikes finally tan-ny or ferruginous ; 

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

 lanoe-ovate, mostly awnless. (0. tenera, var. Olney; C alata, 

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

 Ftg. 362. 



17. C. festuc^cea Schkuhr. Culms stiff, 0.5-1 m. high ; 



360. C. sUicea. 



861. C. alata, 

 mostly coastal. June, 

 Similar ; slender ; the 



0. eutereota. 



