CYPERACE^. (sedge FAMILY.) 599 



31 . C. atr^ta, L., var. ovata, Boott. Very sleuder but erect, 1 - 2° high ; 

 cuhn rather sharp, roughish above ; leaves narrow but flat, shorter thau tlie 

 cuhn ; spikes 3 - 5, all but the terminal one on slender stalks -|- 2' long, droop- 

 ing when mature, 1' long or less, ovate-oblong or short-eylindric, reddish- 

 brown ; perigvnium broadly ovate, thin and puncticulate, very short-beaked, 

 the orifice slightly notched ; scale blunt, thin-margined, about as long as tlie 

 perigyniura. (C. atrata, Mem.) — White Mountains, N. H., Smugglers' Notch, 

 Vt. {Brainerd), and northward. 



++ •*-+ Paludose ; plant larrjer. 



32. C. fUsea, All. Kather slender but stiff, 1-3° high; culm sharp, 

 roughish above ; leaves very narrow, rough, mostly shorter than the culm ; 

 spikes 2-4, the terminal rarely all stamiuate, all sessile and approximate or 

 the lowest sometimes very short-stalked, varying from globular to narrowly 

 cylindric (often becoming 1^' long), dark brown or variegated; perigyniura 

 elliptic and beakless, whitish and granular, nearly nerveless, the orifice entire ; 

 stamiuate scales very long-lanceolate, the pistillate lance-ovate and very sharp, 

 conspicuously longer than the perigynium. (C. Buxbaumii, Wahl.) — Bogs, 

 throughout; frequent. (Eu.) 



* 3. — -1-2. Rigidce. 



33. C. vulgaris, Fries. Low and stiff, about 1° or sometimes 18' high; 

 culm sharp, smooth or rather rough above ; leaves narrow and stiff, shorter 

 than the culm, glaucous-blue ; stamiuate spike sessile or nearly so ; spikes 2 - 

 4, all sessile or rarely the lowest very short-stalked, short and erect (T long or 

 less), very densely flowered or sometimes becoming loose below, the lowest 

 subtended by a bract 1 -3' long; perigynium appressed, oval or round-ovate, 

 mostly finely striate toward the base, the beak entire or very nearly so, bright 

 green until over-mature ; scale ovate and very obtuse, purple with a faint white 

 nerve, conspicuously narrower and shorter than the perigynium, thus causing 

 the spike in the growing plant to assume a characteristic green-and-black ap- 

 pearance. — Swales and low meadows along the sea-board, from Mass. north- 

 ward; common. (Eu.) 



Var. strietiformis, Bailey. Taller (U - 2^° high) and looser ; culms slen- 

 der ; leaves long and narrow, lax, scarcely glaucous ; stamiuate spike longer 

 peduncled ; pistillate spikes looser and often longer, mostly brown or tawny- 

 green. (C. limula, Man.) — Swales from E. Penn. northward, near the sea- 

 board ; frequent. Often confounded with n. 34, but easily distinguished by the 

 non-cespitose habit, sheaths not fibrillose, and the short scaler very obtuse. 



Var. hyperborea, Boott. Somewhat stoloniferous, low, often smaller 

 than the type; spikes shorter and mostly loosely flowered, often becoming 

 very thin ; scales generally longer, giving the spikes a darker color ; stigmas 

 often 3. (C. rigida, var. (?) Bigelovii, Tuckenii.) — Alpine summits of N. II.. 



Vt., andN. Y. (Eu.) 



* 3. — ^ •«- 3. Aciikc. 



f*- Stigmas 2; scales not conspicuous! i/ acute, or if so, divaricatt. 

 = Spikes erect, or rareli/ spreading in n. 34. 



34. C. Stricta, Lam. Tall and slender but erect, 2-4° high, generally 

 in dense clumps when old, or rarely in small tufts; culm sharp, rough above; 



