CLX. CYPERACE^E. 591 



ovate-lanceolate, acuminate, short-bidentate, ciliate glume ; st. I 2f high, 

 acutely triquetrous, rough above, longer than the leaves towards the base. 

 Bright green. Along brooks and streams ; common. 



121. C. CRAWEI. Dew. 



9 Spikes 3 6, cylindric, short and thick, densely flowered, sometimes 

 aggregated, sometimes remote, the lowest often subradical and long-peduncu- 

 late ; perig. ovate, terete, scarcely rostrate, diverging, entire at the orifice, twice 

 longer than the ovate and obtusish glume ; tf spike with one or two small ones 

 at its base. 



122. C. POLYMORPHA. Muhl. 



tf Spikes long cylindric, upper one -pedunculate, with oblong and ovate 

 scales; 9 spikes 2, oblong, cylindric, close-fruited, erect, nearly sessile, upper 

 one staminate at the apex, with nearly enclosed peduncles ; perig. ovate, acu- 

 minate, bilobate, scarcely rostrate, striate, longer than the ovate glume. N. J. 

 and the Southern States. Differs from D. Halseyana in its J* spikes and obtuse 

 glume, in its acuminate, not rostrate fruit, and its larger, fertile spikes. 



H. Stamijiale spikes usually two or more. 



123. C. SCHWENITZH. Dew. 



J^ Spikes 2, rarely 1, upper long and slender, lower with a few perigynia 

 at the base ; 9 spikes 24, oblong, cylindric, subapproximate, subrecurved, 

 subloose-flowered, lowest often long-pedunculate ; perig. ovate-oblong, tapering 

 above, rostrate, inflated, nerved, glabrous, bifurcate, longer than the lanceolate, 

 subulate, subsetaceous glume; st. 6 12' high, scabrous above, very leafy. 

 Pale yellowish-green. Wet sandy grounds. Not abundant. 



124. C. RETRORSA. Schw. 



tf Spikes about 3, rarely 1, often with a few perigynia at the base ; <J> 

 spikes 4 6, oblong-cylindric, approximate, dense-flowered, with long and lealy 

 bracts, the lowest often remote and long-pedunculate ; perig. ovate-inflated, sub- 

 globose, rostrate, bifurcate, nerved, reflexed, twice longer than the lanceolate 

 glume; st. 15 30' high, scabrous above, large, stiff and leafy. Bright green. 

 In clusters, about pools of water, common. The lower spikes sometimes have 

 I or 2 smaller spikes attached to them. 



125. C. ARISTATA. R. Br. 



9 Spikes 2 4, cylindric, distant, close-flowered, erect; perig. ovate, 

 oblong, nerved, deeply bifid, very glabrous, long-rostrate, longer than the 

 oblong, awned glume ; hs. and sheaths villose on the under side ; st. a foot or 

 more high. Bright green. Watertown, N. Y., Torr. <$ Gray. Is not this 

 very closely related to the following species 1 



126. C. TRICHOCARPA. Muhl. 



$ Spikes about 3, erect, rarely 1, or 9 above, cylindric, lower shorter; 9 

 spikes 2 4, erect, long-cylindric, smoothish, rather loose-flowered ; perig. ovate , 

 conic, inflated, nerved, rostrate, bifurcate, densely pubescent, about twice lon- 

 ger than the ovate-lanceolate glume ; st. 15 30' high, scabrous above, and 

 with pubescent leaves and sheaths. Light green. In wet and marshy places ; 

 common. 



(3. turbinata. Dew. 9 Spikes ovate, or short-oblong, thick, remote, dense- 

 flowered; perig. subdiverging, ovate and conic, rostrate, longer than the ovate- 

 oblong, mucronate glume ; st. 2 3f high. Glaucous green. In a pond in 

 Beckman, N. Y., there abundant. 



127. C. LOXGIROSTRIS. Torr. 



cT Spikes 3, short; 9 spikes 2 3, cylindric, quite loose-flowered, pendu- 

 lous, subdistant, with filiform peduncles ; perig. ovate, globose, inflated, gla- 

 brous, long-rostrate, hispid, a little longer than the lanceolate or ovate, cuspi- 

 date glume ; st. 15 30' high, rather slender, stiff, leafy below. Bright green. 

 On light soil of hedges in N. England and N. York. Common. 



128. C. LANCGINOSA. Michx. (C. pellita. Muhl.} 



J* Spikes 2, oblong, slender, erect ; 9 spikes 2 3, cylindric, erect, dense- 

 flowered, sometimes short-oblong and thick, subrostrate ; perig. ovate, short- 

 rostrate, bicuspitate, subtriquetrous, thick, pubescent and woolly, about equaling 

 50* 



