CYPERACE^. (SEDCJK FAMILY.) 595 



C. ni'LiAxA X rxRicurATA, Bailey, rerigynium coiisitleralily smaller aii(i 

 more spreading, less shining; scales longer and sharper. (('. (JLneyi, lioutt.) 



— Providence, R. I. {(Jlw-;i). 



15. C. retrorsa, Schwein. stout, 2-3'^ high; culm olttusely angled 

 and smooth or nearly so; leaves broad and soft, roughish, mucli longer than 

 the culm; spikes .'J -5, approximate uear the top of the culm or the low- 

 est remote, all but the lowest 1 or 2 sessile, 1 - 2' long and very compactly 

 Howered, erect or spreading ; perigyuium very thin and papery, much inflated, 

 prominently nerved, strongly reflexed ; scale very short and small. — Swamps, 

 from Tenn. northward, common. — In var. Hartii, Gray, .a common mon- 

 strous form, the spikes are more or less scattered and pedunded, loosely flow- 

 ered, and the pcrigynium less reflexed or spreading. 



= = Scales all routjh-uicned. 



16. C. Itiricla, Wahl. Varial)le in size, mostly ranging from H-3° 

 high, stout; cuLu rather obtusely angled and smooth; leaves long and loose, 

 rough; spikes 2-4, variously disposed, the I or 2 upper sessile, nearly erect 

 or often drooping, very densely flowered ; perigyuium thin and turgid, often 

 somewhat shining, rather lightly about 10-nerved, very long and slenderly 

 beaked, ascending; staminate spike single, scales linear, half as long as the 

 perigyuium or more. (C. tentaculata, Mu/il.) — Swamps, N. Eug. to S. HI., and 

 southwaril ; al>un(hLnt eastward. Very variable. — Var. okAcilis, Bailey, 

 riant more slender; spikes 2-3, very small and narrowly cylindrical (1' 

 long or loss, and .3" broad or less). Mts. of Vt., Penn., and Tenn, 



Var. flaccida, Bailey. Lower, scarcely exceeding 12-15' in height; 

 spikes 2-4, all sessile and approximate at the to]) of the culm, small and 

 straight (!' long or less), dull brown or reddish-brown, loosely flowered and en- 

 tirely lacking the dense and comose appearance of the type ; perigynium very 

 thin and much inflated, the body usually larger than in the type and more 

 gradually contracted into the beak. — N. Y. to N. J.; apparently scarce. 



C. LURiDA X I, i'itlIna, Bailey. Very like C. lurida, but the si)ikes u.su- 

 ally .'ill approximate or only the lowest .separated, erect or spreading, all .sessile, 

 green or greenish, often curved ; perigyuium very long-beaked and ascending ; 

 staminate spike one, sessile or very nearly so, strongly resembling that of C. 

 lupulina. {C. tentaculata, var. altior, Bnott.) — Mass., Conn., and N. Y. ; little 

 known. C. lupulina X retrorsa is distingnislied from this by its yellow or 

 straw-colored more scattered spikes which are shorter and always straight, 

 and the loose, larger and more inflated perigynia. 



* 1. — -»- 4. Pseudori/penp. 

 +H- Spikes all erect or ascending. 



17. C. Schweinitzii, Dewey. Soft but erect, 1 -2° high, stolon iferous, 

 yellowish-green and becoming straw-colored in drying; culm flattish and 

 smooth; leaves broad (3-4"), the radical longer than the culm, the others 

 mostly short; spikes 3-4, the lower one or two short-pedunded, narrowly 

 long-cylindrical (1^-3' long, 4" broad) ; perigynium thin and somewhat in- 

 flated, prominently few-nerved, the long beak short-toothed, ascending ; scale 

 awned and commonly rough at the tip, a little shorter than the perigynium. 



— Swamps, \V. New Eng. to \. J., and west to Mich. ; local. 



