PLANTS OF SOUTHERN NEW JERSEY. 289 



f. 15 mm. long, pistillate scales sharp pointed. 



C. squarrosa, p. 294 

 //. 25 mm. long, pistillate scales blunt. 



C. typhinoides, p. 294 

 ee. Spikes 6 mm. thick or less. 



/. Spikes three-clustered at the top of the culm, 4-6 mm. 

 thick, but little longer. 



g. Leaves hairy. C. triceps, p. 298 



gg. Leaves smooth. C. caroliniana, p. 299 



if. Spikes several, 3-4 mm. thick, often slightly drooping. 



C. swanii, p. 298 

 dd. Perigynia reflexed, spikes solitary, 5 mm. thick. 



C. exilis, p. 306 

 bb. Spike elongated or globular, dense and bristling, somewhat irregular 

 and branched on very short peduncles. 

 e. Spikes yellow or tawny when mature. 



f. Perigynia enlarged and inflated at the base, long slender beak, 

 much longer than the body. C. stipata, p. 306 



//. Perigynia firm and not enlarged or inflated at the base, beak 

 shorter than the body. 

 g. Leaves equal to or exceeding the culms. 



C. viilpinoidea, p. 306 

 gg. Leaves shorter than the culms. C. anncctcns, p. 307 



ee. Spikes green. 



/. Heads nearly globular, 7-15 mm. long, leaves soft. 



C. cephalophora, p. 307 

 ff. Heads elongated, 15-40 mm. long, leaves stiflf and wiry. 



C. tnuhlenbergii, p. 307 

 bbb. Inflorescence, a series of star-like (ovoid in canescens) clusters, 

 sometimes close together at the end of the culm, usually with the 

 lower remote. 

 c. Staminate flowers at the base of the spike. 



d. Perigj-nia plano-convex, spikes 6-12 mm. long. 



C. canescens disjuncta, p. 310 

 dd. Perigynia with thin or winged margins. 



e. Perigynia broadest at the base, beak rough or serrulate. 

 /. Perigynia never more than half as broad as long, 3-4 

 mm. long. C. cephalantha, p. 309 



ff. Perigynia more than half as broad as long. 



g. Scales sharp pointed, leaves 2.5-4.5 vara, broad, 



inflorescence 15-35 nim. long, spike 15-50 flowered, 



plant coarse. C. atlantica, p. 309 



gg. Scales blunt, leaves narrower, inflorescence 10-20 



mm. long, spike 5-15 flowered; plants slender. 



h. Leaves 1-2 mm. broad. C. interior, p. 308 



hh. Leaves still narrower. C. i. capillacea, p. 308 



ee. Perigynia broadest near the middle, less than 2 mm. 



broad, beak short and smooth. C. seorsa, p. 309 



19 MUS 



