288 REPORT O'F NEW JERSEY STATE MUSEUM. 



n. Perigynia with short beak, twisted to one 

 side, ribbed. 



/. Pistillate spikes dense, closely imbricated. 



C. granulans, p. 300 



jj. Pistillate spikes, rather loosely flowered, 



especially below, not closely imbricated. 



k. Leaves 3-7 mm. wide, spikes and 



perigynia shorty latter 2.5-4 mm. 



C. laxiAora, p. 301 

 kk. Leaves 6-20 mm. wide, spikes and 

 perigynia long, latter 2-2.5 mm. 



C. I. patuUfolia,, p. 302 



hhh. Pistillate spikes forming 1-3 small clusters at 



the base of the sessile staminate spike. Entire 



inflorescence occupying less than one inch of 



the top of the stem. 



i. Perigynia densely wooly, beaked ; beak long 

 and flat. 



j. Plant stoloniferous, the elongated, often 

 leafless stolons scaly and creeping, inflo- 

 rescence purplish. C. pennsylvanica, -p. 307^ 

 ij. Plant cssspitose not stoloniferous, inflo- 

 rescence greenish. 



C. varia emmonsi, p. 304 

 ii. Perigynia glabrous, ellipsoid, not beaked. 



C. leptalea harperi, p. 305. 

 hhh. Inflorescence much exceeded by the leaves, but not sessile. 

 c. Scales more or less dark purple margined. 



d. Inflorescence all at the summit of the stalk, pistillate and' 

 staminate spikes closely associated. C. nigromarginata, p. 305 

 dd. Inflorescence in several rather remote heads. 



C. pedunculata, p. 3P3 

 cc. Scales green. 



d. Staminate spike at tip of pistillate, the latter of only 3-9- 



achenes. C. willdenovii, p. 305 



dd. Staminate spike at base of pistillate, the latter of typical 



form, many flowered. C. abscondita, p. 303 



aa. Staminate and pistillate flowers mingled in the same spike, sometitries- 



occupying different parts of it. 



h. Spike regular cylindrical. 



c. Staminate portion terminal. 



d. Spikes 7-50 mm. long, always dark brown, more or less vari- 

 egated, perigynia white, beakless. C. huxhaumii, p. 296- 

 dd. Spikes green, scales whitish 4-16 mm. long. 



C. I. harperi, p. 305 

 cc. Staminate portion basal, persisting as a sheath of imbricated 

 scales, embracing the base of the spike. 

 d. Perigynia not reflexed. 

 e. Spikes 12 mm. thick. 



