CYPERACE^E. (SEDGE FAMILY.) 605 



C. GRACfLLiMA X PUBESCENS, Bailey. Tall and erect; leaves narrower 

 than in the last, usually slightly hairy ; spikes slender, erect or slightly spread- 

 ing, often staminate at top ; perigynium exactly intermediate between the two 

 epecies, ovate, obscurely nerved, sparsely hairy, beaked, about the length 

 of the ovate ciliate rough-awned scale. (C. Sullivantii, Boott.) Columbus, 

 Ohio (Sullivant) ; Yonkers, N. Y. (E. C. Howe) ; Stanton, Del. (Commons). 

 4H. ++ Perigynium large, prominently inflated. 



56. C. formdsa, Dewey. Slender, erect, 1 - 2| high ; leaves flat, mostly 

 rather broad, those of the culm very short : spikes 3-5, scattered, oblong or 

 short-cylindrical (!' long or less), compact, all flexuose or drooping; perigyn- 

 ium ovate, puncticulate, obscurely nerved, short-beaked with a slightly notched 

 orifice, all but the low r est one or two twice longer than the blunt or cuspidate 

 scale. Woods and copses, Vt. to Mich. ; local. 



57. C. Davisii, Schwein. & Torr. Always taller ; spikes heavier ; peri- 

 gynium more inflated, strongly nerved and prominently toothed, no longer or 

 shorter than the conspicuously awned and spreading scale. Wet meadows, 

 W. Mass, to S. Minn., and southward ; rare east and northward. 



# 4. +~ 6. Grisece. 



58. C. grisea, Wahl. Stout, 1 - 2 high ; leaves broad (2 - 3") and slightly 

 glaucous ; bracts broad and leaf -like, diverging, very much exceeding the culm ; 

 staminate spike small and sessile ; pistillate spikes 3-4, short (!' long or less), 

 the highest two usually contiguous to the staminate spike and sessile, the others 

 somewhat remote and peduncled, all erect, compact ; perigynium oblong, point- 

 less, marked with impressed nerves, turgid and cylindric, all but the lowest 

 longer than the narrow, cuspidate or blunt, nerved scale. Moist grounds, 

 throughout, except along our northern borders; common. Var. ANGUSTI- 

 r6LiA, Boott. Much more slender ; leaves scarcely half so wide, the bracts, 

 especially, much narrower and shorter and more erect ; spikes slender ; peri- 

 gynium scarcely inflated, triangular-oblong, bearing a sharp beak-like point, 

 2-ranked ; scale nerveless, long-awned and spreading. N. J. to S. Ohio, and 

 southward ; common. Var. GLOB6SA, Bailey. Low, 3-12' high, often spread- 

 ing ; spikes few-flowered, often with but 2 or 3 perigynia ; perigynium short, 

 inflated, very blunt, nearly globose or obovate ; scale short, not prominently 

 cuspidate or the upper ones wholly blunt. Mo., Kan., and southward. 



Var. (?) rigida, Bailey. Rigid; leaves rather narrow, long and erect; 

 staminate spike prominently peduncled ; pistillate spikes scattered, all more 

 or less stalked, conspicuously 2-ranked ; perigynium triangular-oblong, hard, 

 longer than the cuspidate ascending scale. Sellersville, Penn., and Del. 



59. C. glaucodfea, Tuckerm. Lax or somewhat strict (6-18' high), 

 densely glaucous ; leaves flat, variable in width ; spikes as in n. 58 ; perigy- 

 nium firm, not inflated, prominently impressed-nerved, glaucous, longer than 

 the short-cuspidate or blunt thin and appressed scale. (C. flaccosperma, last 

 ed.) Meadows and swamps, Mass, to S. 111., and southward; local. 



* 5. SPIROSTACHY^E. - 1. Granulares. 



60. C. granularis, Muhl. Erect or spreading, 8" - 2 high, somewhat 

 glaucous; leaves flat, various; bracts broad and long, much exceeding the 

 culm ; spikes 3-4, scattered, all but the upper peduncled, erect or ascending, 



