PUANTS OF SOUTHERN NEW JERSEY. 257 



Middle District. — New Egypt, Florence, Birmingham, Delanco (S), Med- 

 ford (S), Lindenwold, Paulsboro, Swedesboro, Sharpstown, Dividing Creek. 



Pine Barrens. — Toms River (NY), Lakehurst, Forked River, Waretown, 

 Bear Swamp (S), Hammonton (NY), Landisville, Petersburg (S), Egg 

 Harbor (NB). 



Cape May. — Cape May, Town Bank. 



ELEOCHARIS R. Brown. 



Key to the Species. 



a. Spikes 2-6 cm. long of nearly or quite the same diameter as the culms. 

 h. Scales blunt and rounded, spike blunt, cylindrical. 



c. Culm, four-angled. E. quadrangulata, p. 258 



cc. Culm terete. U. interstincta, p. 258 



hb. Scales sharp pointed, spike linear, awl-shaped. E. robbinsii, p. 258 

 aa. Spike much thicker than the culm. 

 b. Spike 6-15 mm. long. 



c. Mature spikes at least 3 mm. thick. 

 d. Scales pointed, tips spreading. 



e. Culms 3-15 dm. tall, stout. E. palustris, p. 260 



ee. Culms 2-4.5 dm. tall, slender. E. glancescens, p. 260 



dd. Scales blunt, spikes more or less globose. 



e. Scales short and rounded, closely imbricated. 



f. Spikes globose. E. obtusa, p. 259 



//. Spikes oblong, cylindric. E. engelmanni, p. 260 



ee. Scales longer and more loosely arranged. 

 f. Scales brown with a lighter mid-vein. 



E. melanocarpa, p. 262 

 ff. Scales greenish with a dark mid-vein. 



g. Spike ovoid, culms not rooting at tip. 



E. tuberculosa, p. 261 

 gg. Spike spindle shaped, sterile culms often rooting at 

 tip. E. rostellata, p. 264 



cc. Mature spikes less than 3 mm. thick. 



d. Scales minute, rounded, closely imbricated, spike cylindrical, 

 6-15 mm. long. E. tricostata, p. 262 



dd. Scales larger, more loosely arranged, spikes 4-6 mm. long. 



E. tenuis, p. 263 

 bb. Spikes 2-6 mm. long. 



c. Culms spirally twisted. E. tortilis, p. 263 



cc. Culms not twisted. 



d. Culms 2-4 dm. high. E. tenuis, p. 263 



dd. Culms not over 2 dm. high (seldom over 1-5 dm.). 

 e. Culms capillary. 



/. Spikes two to six-flowered, i mm. broad. 



E. acicularis, p. 260 

 ff. Spikes six to many-flowered, culms often proliferous. 



E. torreyana, p. 261 

 ee. Culms thicker. 

 17 MUS 



