604 CYPERACE^E. (SEDGE FAMILY.) 



perigynium usually larger. Lisbon, N. H. (Faxon); Keweenaw Co., Mich 

 (Farwett) ; extreme northern Minn. (Bailey) ; also in Canada. 



52. C. ctebilis, Michx., var. Klidgei, Bailey. Very slender and diffuse, 

 1 - 2| high (or rarely reduced to 3 - 4' !) ; leaves narrow and lax, longer than 

 the culm ; spikes mostly heavier than in the last ; perigynium much longer, 

 very gradually narrowed at each end, scarcely angled and not prominently 

 nerved, rusty when ripe, erect, twice longer than the obtuse or acutish scale 

 (C. debilis, of last ed.) Copses, N. Eng. to N. Mich., and southward; fre- 

 quent east and southward. Var. STRf CTIOR, Bailey. Usually taller, strict ; 

 leaves broader (about 2" wide) and firmer; spikes stiff er, simply spreading 

 or even erect ; perigynium mostly shorter and greener, often little exceeding 

 the scale. White Mts. (Faxon). Var. ptiBERA, Gray. Perigynium usually 

 more slender, more nerved and minutely pubescent. Center and Lancaster 

 Counties, Penn. (Porter, Lumsden), and Bedford Co., Va. (Curtiss). 



C. DEBILIS X VIRESCENS, Bailey. Plant slender and very green ; leaves 

 flat, rough, mostly longer than the culm , spikes 2-3, 2' long, thin and slen- 

 der, erect or nearly so, the terminal one bearing a few pistillate flowers at top ; 

 perigynium exactly intermediate between the two species, lance-ovate, nerved 

 and slightly hairy, short-beaked, thin, twice longer than the scale. Revere, 

 near Boston, Mass. (Faxon). 



** ** Perigynium firm, prominently many-nerved. 



53. C. vemista, Dewey, var. minor, Boeckl. Slender but strict, 1|- 

 2 high ; leaves narrow and strict, about as long as the culm ; spikes 1-2' 

 long, scattered, the upper usually ascending, the terminal one sometimes 

 staminate at top ; perigynium ascending, the very short and stout beak prom- 

 inently toothed, thrice longer than the rusty narrow scale. (C. glabra, Boott.) 

 Sphagnous swamps, Oneida Co., N. Y., N. J., and southward ; local. 



# 4. *- 5. Gracfllimce. 

 +* Perigynium small, scarcely turgid. 



54. C. SBStivalis, M. A. Curtis. Slender but erect, 1 -1| high; leaves 

 very narrow, flat, shorter than the culm, the sheaths pubescent; spikes 3-4, 

 erect or spreading, 1-2' long and very loosely flowered, all but the lowest 

 short-stalked ; perigynium very small, ovate, scarcely pointed and the orifice 

 entire, few-nerved, about twice longer than the obtuse scale. Saddle Moun- 

 tain, W. Mass., and southward in the mountains to N. C. ; rare. 



55. C. gracillima, Schwein. Tall and slender, sometimes diffuse, 1|- 

 3 high ; leaves broad and flat (the radical about 3" wide), very dark and 

 bright green; spikes 3-4, scattered, the terminal rarely staminate, densely 

 flowered except at base, ped uncled and drooping, green ; perigynium ovate, 

 thin and slightly swollen, nerved, obtuse, orifice entire, twice longer than the 

 f ery obtuse scale. Woodlands and low meadows, throughout ; common. 

 In poorer soil and sunny places, it runs into var. HtiMiLis, Bailey, and is then 

 smaller, has much narrower leaves and very small erect spikes (2-12-flow- 

 ered), and mostly smaller perigynia. 



C. GRAcfLLiMA X HiRsfjTA, Bailey. In habit like var. humilis; spikes 

 tawny ; perigynium like that of C. triceps, var. hirsuta ; plant smooth, or very 

 minutely pubescent under a strong lens. Philipstown, N. Y. (Barratt). 



