CAREX. 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 ; $ spike with one or two small ones 

 at its base. 



122. C. POLYMORPHA. Muhl. 



cP 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. Haheyana in its $ spikes and obtuse 

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



H. Staminate spikes usually two or more. 



123. C. SCHWENITZII. Dew. 



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

 at the base ; 9 spikes 2 4, 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. 



$ Spikes about 3, rarely 1, often with a few perigynia at the base ; Q 

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

 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 

 1 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 ; Ivs. 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. 



tf 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. 



/?. 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. LONGIROSTRIS. Torr. 



tf 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. LANUGINOSA. Michx. (C. pellita. Muhl.) 



tf 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* 



