288 REPORT OF NEW JERSEY STATE MUSEUM. 



a. Perigynia with short beak, twisted to one 

 side, ribbed. 



j. Pistillate spikes dense, closely imbricated. 



C. granulans, p. 30O' 



jj. Pistillate spikes, rather loosely flowered, 



especially below, not closely imbricated. 



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



perigynia short, latter 2.5-4 itli^- 



C. laxiAora, p. 301 

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

 perigynia long, latter 2-2.5 mm. 



C. I. patulifolia,, p. 302- 



hhli. 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. 



/. Plant stoloniferous. the elongated, often 

 leafless stolons scaly and creeping, inflo- 

 rescence purplish. C. pennsylvanica, p. 303 

 //. Plant csespitose not stoloniferous, inflo- 

 rescence greenish. 



C. varia emmonsi, p. 304 

 ii Perigynia glabrous, ellipsoid, not beaked. 



C. leptalea harperi, p. 305 

 hhb. 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. pcdunciilataj p. 303 

 cc. Scales green. 



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



achenes. C. innlldenovii, 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, sometimes 



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 bu.vbaumii. 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. Perig>'nia not reflexed. 

 c. Spikes 12 mm. thick. 



