CHAPTER II. 



CYPERACEAE, SEDGE FAMILY. 

 Sedge {Car ex vulpinoidea Mx.). 



Achene enclosed by an utricle called the perigynium, hardly 3- 

 angled, somewhat flattened, tipped, by lanceolate 2-toothed beak, 

 the persistent base of the flower-style ; achene flask-shaped, about 



Figure 236 A. 



Figure 23fiB 



Fig. 236. Forms of Sedges, a, Eleocharis palustris; b, Carex vulpinoidea. 



(After Gray.) 



one-sixteenth of an inch in length, light brown; surface incon- 

 spicuously nerved ; whitish, projecting scar. 



Spike Rush {Eleocharis palustris K. Br.). 



Achenes slightly flattened, somewhat lenticular, with 2 or 3 ob- 

 tuse angles one-twelfth to one^tenth in. long, brown, smooth, shin- 

 ing, minutely cross-striated ; seed with persistent tubercle from tip ; 

 tubercle conical, triangular, constricted; bristles pale, longer than 



