OP ARTS AND SCIENCES. 123 



soft and grass-like : spikes one to three, approximate or usually con- 

 tiguous (the two lowest very rarely more than a half-inch apart), 

 globose, all sessile, commonly more or less dark-colored. Forms 

 occasionally occur in which the beak is nearly as long as the body of 

 the perigynium. Upon this form Willdenow founded his C. lucorum. 

 — New England to Georgia and across the continent. 



187. Carex varia, Muhl. ; WiUd. Sp. PI. iv. 259. 



C. varia, var. pedicillata, Dewey, Sill. Journ. xi. 163. 



C. coUecta, Dewey, 1. c. 314. 



G. Pennsylvanica, var. Muhlenhergii, Gray, Gram. & Cyper. Exsicc. 



C. Pennsylvanica, Torr. Monogr. 410. 



C. varia, var. minor, Boott, III. 97. 

 Not stolouiferous : stouter, leaves broader (one and a half to two 

 lines broad), usually shorter than the more or less prolonged culms 

 (which range from ten inches to two feet in height), rather rigid and 

 pale : spikes three to five, globose or oblong, scattered (from one half 

 to an inch and a half apart), mostly light colored, the lowest often 

 peduncled and commonly subtended by a conspicuous bract. In the 

 large forms, which are rare, the spikes are all oblong and more or less 

 peduncled. — Dry hillsides, Canada to Georgia. Less common than 

 the last. 



188. Carex rigens, Bailey, Bot. Gaz. ix. 117. 



C varia, var., "W. Boott, Proc. Am. Acad, xviii. 172. 

 0. varia, var. Arizonica, Bailey, Carex Cat. 

 Stolouiferous : rough throughout : culm six to twelve inches high, 

 stiff, mostly longer than the stiff and rough long-pointed leaves, their 

 bases surrounded by the fibrous remains of leaves : lowest bract green, 

 neai'ly as long as the culm, the upper ones awl-pointed and little longer 

 or shorter than their spikes: staminate spike an inch long, short- 

 peduncled : pistillate spikes about three, pale, sessile, not aggregated, 

 one fourth inch or less long or sometimes prolonged and staminate at 

 the top : perigynium obovoid, large, angled, many-nerved, very gradu- 

 ally contracted into a stout base, grp.dually narrowed into a short 

 entire or slightly toothed beak, thinly hairy, mostly shorter than the 

 very acute thin scale : achenium obovoid. — S. Arizona, Tanner's 

 Caiion, Lemmon 2904 ; Mexico, San Luis Potosi, Schaffner 547, 

 Parry & Palmer 91-7. 



189. Carex turbinata, Liebmann, Mex. Halv. 77. 



" Culm eight to twelve inches high, slender, trigonous, angles rough : 

 leaves shorter than the culm, narrowly linear, carinate, margins rough : 



