144 PROCEEDINGS OF THE AMERICAN ACADEMY 



C. canescens, var, ^, Torr. Monogr. 393. 



C. canescens, var. sphcerostachya, Tuckerman, Enum. Meth. 10. 



C. Buckley i, Dewey, Sill. Journ. xlviii. 143. 



C. sphcerostachya, Dewey, 1. c. xlix. 44. 



G. canescens, var. vitilis, Carey, Gray's INIan. 2d ed. 514. 



C. canescens, vars. minor and brunnescens, Boott, 111. 220. 



C. vitilis, var. brunnea, Olney, Bot. King's Rep. 364. 



G. Bolanderi, vars. minor and spar si flora, Olney, Proc. Am. 

 Acad. 1872, 407. 

 Exceedino-ly variable. At times it counterfeits forms of G. echinata, 

 var. microstachys. — Throughout the continent north of N. Carolina. 

 Var. POLYSTACHTA, Boott, Rich. Journ. ii. 344. 



G. arcta, Boott, 111. 155, t. 497. 



G. leiorhyncha, Kunze, Suppl. Riedgr. t. 21, not C. A. Meyer. 



G. Kunzei, Olney, Proc. Am. Acad. 1872, 407. 

 Spikes approximated or densely aggregated into a head, the lower 

 ones often subtended by a short bract, which is dilated at the base ; 

 perigynium longer-pointed than in the species, nerved, stipitate and 

 spreading. — Ashland, Massachusetts, Morong ; Vermont, Barnet, 

 Blanchard, Alburgh, Pringle; Maine, Porter; Canada, McCrae, and 

 westward to Oregon, Hall, Howell, and Henderson. 

 2G3. Carex helvola, Blytt; Fries in Bot. Notiser, 1848, 58. 



Differs from G. canescens, var. duhia, which may not be distinct, 

 chiefly in its broader scales and entirely smooth and nerveless peri- 

 gynium. — Said by Boeckeler to occur in Greenland. 



264. Carex pr^gracilis, W. Boott, Bot. Gaz. ix. 87. 



Culm exceedingly slender (over two feet high and scarcely half a 

 line broad), naked, stiff and erect, rough on the angles above : leaves 

 thread-like and convolute : head a half-inch long, a line broad, com- 

 posed of three or four small contiguous spikes, the uppermost of 

 which is conspicuously staminate-flowered at the base : bracts pos- 

 sessing a clasping base and tapering into a rough somewhat spreading 

 awn which exceeds its spike : scales similar to the bracts, but 

 shorter and broader, covering the perigynia : perigynium brown, 

 ovate-acuminate, obscurely nerved, somewhat rough on the margins 

 above. — San Diego, California, Miss Scott. 



265. Carex trisperma, Dewey, Sill. Journ. ix. 63. 



Maryland and Pennsylvania to Newfoundland, La Pylaie, and 

 Great Plains of British America, Macoun, and Carlton House, 

 Drummond. 



