438 MONOCOTYLEDONOUS PLANTS. 



ovate triquetrous, rostrate, pubescent, orifice nearly entire, as long a 

 the ovate mucronate glume ; leaves and culm pubescent. 



HAB. Woods. Can. to Penn. May. !. Culm 12 18 inch ,-* 

 high, erect or subdecumbent. Leaves very pubescent. 



50. C. fiava Linn. : sterile spike on a short peduncle ; fertile mostly 

 3, ovate, subapproximate, (the lowest rather remote,) on short includ- 

 ed peduncles ; fruit ovate, densely imbricate, bidentate, with u curved 

 and reflexed rostrum, shorter than the ovate-lanceolate glume. 



HAB. Meadows. Can. and N. Y. 2t.Culm 1214 



inches high, erect. Fertile spikes 2 4. Whole plant greenish- 

 yellow. -Found in the western part of New- York, by Dr. Gray. 



51. C. ttdcri Linn. : sterile spike on a short peduncle ; fertile about 

 3, ovate, approximate, subpedunculate, densely (lowered ; fruit ovate- 

 globose, horizontal, with a straight rostrum. 



HAB. Rocky banks. Hudson's Bay, Can., N. Y. and N. J. 

 June. "U.Culm 8 J2 inches high. Resembles C.jlava, but 

 differs in having the spikes more densely flowered and the fruit 

 smaller. 



52. C. tentaculata Miihl. : fertile spikes 2 3, (rarely 4,) sessile, ovate 

 or ovate-cylindrical, approximate, horizontal ; bracts very long ; fruit 

 ovate, ventricose, nerved, with a very long rostrum, orifice bidentate, 

 longer than the lanceolate glume. 



HAB. Wet meadows. Can. to Geor. May, June. 1(. Culm 

 12 18 inches high. Spikes large and thick, varying in length. 

 Plant yellowish-green. 



53. C. nigra All. : sterile spike pedunculate ; fertile 2 3, (rarely 

 4,) rather remote, oblong (black) sessile, erect; fruit obovate, com- 

 pressed-triquetrous, subacute, orifice entire, as long as the ovate glume. 



HAB. Labrador. White Hills, N. H. July. 1C. Culm 8-12 

 inches high. Fruit smooth and nerveless. Stigmas 23. 



54. C. lupulina Muhl. : sterile spike on a short peduncle, (rarely 

 geminate ',) fertile 3, subsessile, ovate-oblong, erect, approximate ; 

 bracts very long and leafy ; fruit ovate, inflexed, nerved, long-rostrate, 

 bicuspidate, much longer than the ovate glume. 



b. polystachia T. ft S. : fertile spikes 5, oblong-cylindric, lowest 



one remote, on a long peduncle. 

 e. pedunculate, Gray : fertile spikes all pedunculate; the lower 



long-pedunculate, distant, the 3 upper subumbellate. 

 Hvn. Swamps. Hudson's Bay to Geor. June. 2^. Culm 



2-3 feet high, very thick, smooth and leafy. Spikes very thick. 



Var. c. was found by Dr. Gray on the shores of Lake Erie. 



It flowers in July. 



55. C.folliculata Linn. : sterile spike pedunculate ; fertile 2, (often 

 solitary,) roundish, approximate, few-flowered, upper one sessile, low- 

 er one short peduncled ; bracts leafy ; fruit ovate, acuminate-rostrate, 

 ovate, reflexed and diverging, bicuspidate. 



