CYPERACE.E. (SEDGE FAMILY.') 595 



C. BULLATA X UTRICULA.TA, Bailey. Perigynium considerably smaller and 

 more spreading, less shining; scales longer and sharper. (C. Olneyi, Boott.) 



Providence, 11. I. (Olney). 



15. C. retrorsa, Schwein. Stout, 2-3 high; culm obtusely angled 

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

 the culm ; spikes 3-5, approximate near the top of the culm or the low- 

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

 flowered, erect or spreading ; perigynium very thin and papery, much inflated, 

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

 from Peuii. northward, common. In var. HARTII, Gray, a common mon- 

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

 ered, and the perigynium less reflexed or spreading. 



= = Scales all rough-awned . 



16. C. liiricla, Wahl. Variable in size, mostly ranging from H-3 

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

 rough ; spikes 2-4, variously disposed, the 1 or 2 upper sessile, nearly erect 

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

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

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

 perigynium or more. (C. tentaculata, Mulil.) Swamps, N. Eug. to S. 111., and 

 southward; abundant eastward. Very variable. Var. GRACILIS, Bailey. 

 Plant more slender; spikes 2-3, very small and narrowly cylindrical (!' 

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



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

 spikes 2-4, all sessile and approximate at the top of the culm, small and 

 straight (1'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. LUKIDA X LI-PUI.INA, Bailey. Very like C. lurida, but the spikes usu- 

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

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

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

 lupuliua. (C. tentaculata, var. altior, Boott.) Mass., Conn., and N. Y. ; little 

 known. C. lupulina X retrorsa is distinguished 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. t 4. Pseudocyperce. 

 w- Spikes all erect or ascending. 



17. C. Schweinitzii, Dewey. Soft but erect, 1-2 high, stoloniferous, 

 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-peduucled, narrowly 

 long-cylindrical (l-3' long, 4" broad) ; perigyuium thin and somewhat in- 

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

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



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



