I 



CYPERACKyE. (sKDGK FAMILY.) .097 



sliarp-cd^cd, nerveless, the orifice entire, ])crfoctly s<iu;irrose; scale tliin and 

 blunt, al)()Ut the leni^th of the perigyuium. — Wet meadows, 8. I'enn. and V'a. 

 to 111. ; rare eaiitwurd. 



» 2. — •»- 2. Andmahe. 



23. C. SCabr^ta, Schwein. Tall and rather stout, very leafy, 1 - 3° hi^'h , 

 culm sharply and very roughly angled; leaves broad an<l flat, very rough; 

 spikes 3- f), scattered, the upper 1 or 2 sessile, the remainder often long-pe- 

 duncled and sometimes nodding, 1-2' long, narrowly cylindrical and com- 

 ])actly flowered ; perigyuium broadly ovate, prominently few-nerved, rough, 

 the beak nearly as long as the body and slightly toothed ; scale acute and 

 rough-tipped, green-nerved, about as long as the body of the perigynium. — 

 Wet meadows and glades, as far west as Mich. ; common eastward. 



* 2. — ■«- 3. Hula. 



24. C. vestita, Willd. Stout and stiff, 2-3° high; culm sharply an- 

 gled, smooth or somewhat rough ; leaves narrow and rather short, rough- 

 ish ; staminate spike 1, rarely 2, sessile or nearly so; pistillate spikes 2-5, 

 approximate and sessile, or rarely the lowest sub-radical, often staminate at 

 top, oblong or short-cylindric (rarely T l»)ng), compactly flowered; perigyn- 

 ium ovate, nerved, stifHy hairy, short-beaked, the beak often purple, and white- 

 hyaline at the orifice, which becomes more or less s])lit with age ; scale thin 

 and blunt or acute, shorter than the perigynium. — Tufted in sandy soils, from 

 N. Eng. to N. Y., and southward ; frequent. 



25. C. Striata, :\Iichx., var. br^vis, Bailey. Stiff, U-2|° high ; culm 

 sharply angled, smooth or slightly rough above, mostly exceeding tlie leaves ; 

 leaves narrow and stiff, becoming involute; spikes 1 -2, mostly closely sessile, 

 considerably separated when two, short (rarely 1^' long) and rather tliick, 

 erect ; perigynium broad-ovate with impressed nerves, smooth, ascending, short- 

 beaked and very short-toothed ; scale thin, obtuse or acutish, mostly about \ as 

 long as the perigynium. — Pine-barren swamps, N. J., and southward; local. 



26. C. Houghtonii, Torr. Stiff, 1-2° high, extensively creeping; 

 culm rather sharply angled, rough, exceeding the leaves; leaves flat and very 

 siiarp-poiuted ; spikes 1-3, sessile or the lowest short-stalked, erect, varving 

 from nearly globular to cylindric (1^' long), compact ; perigyuium short-ovate, 

 stitily pubescent, prominently nerved and toothed ; scale thin-margined, acute 

 or awned, shorter than tlie perigynium. — Sandy knolls and banks from Maine 

 to Minn, along our northern borders, and northwestward; rather local. 



27. C. filiformis, L. Tall and very slender but erect, 2-3° high; culm 

 o])tuse, smooth; leaves very long, involute-filiform, rough; spikes 1-3, ses- 

 sile, somewhat scattered, erect, short and thick (rarely over 1' long) ; perigyn- 

 ium very short-ovate, the teeth very short, the few nerves obscured by the 

 dense stiff hairs ; scale thin and blunt, about as long as the perigynium. — 

 Bogs, throughout, north of Penn. ; frequent. (Eu.) 



Var. latif 61ia, Boeckl. Culm mostly rougli above ; leaves flat, 1 - 2" 

 broad ; spikes usually somewhat slimmer and scales often sharper and longer. 

 (C. lanuginosa, Michx.) — Swales and low meadows, throughout; common. 



C. HfRTA, L. Variable in size (A -2° high), widely cree])ing; culm rather 

 slender but erect, obtuse and smooth or slightly rough above ; leaves soft antl 



