328 North American Ci/peracca. 



heads of spikes. The latter has a larger and decompound 

 umbel with the spikes longer, brownish, fewer in a head and 

 not so closely aggregated. 



11. SCIRPUS LENTICULAKIS. 



Culm obscurely triangular, leafy; umbel doubly compound; 

 involucre 3-leaved; spikes oblong-ovate, in heads of 5 to 8 ; 

 scales ovate, scarcely mucronate, smooth; style 2-cleft; nut 

 orbicular, lenticular, with the edges acute, shorter than the 4 

 straight bristles. 



Culm 3 feet or more in height, smooUi, very obtusely triangular helow. 

 Leaves 4 — 5 lines wide, overtopping the culm, somewhat scabrous on 

 the margin. Umbel spreading, twice or even thrice compounded; prin- 

 cipal rays 3 — 5, nearly as long as the involucre ; secondary rays slender, 

 about an inch long, each bearing 5 to 8 sessile, but not closely aggre- 

 gated spikes. Spikes 3 lines long, rather acute. Scales broadly ovate, 

 of a dark olive-green colour, rather obtuse : midrib somewhat prominent. 

 Bristles retrorsely scabrous, one-third longer than the nut. Stamens 

 constantly 2. Nut whitish, nearly orbicular, with a short abrupt acu- 

 mination, much compressed, the edges thin. 



Hab. North- West Coast of America, near Observatory 

 Inlet, Dr. Scolder! 



Obs. Nearly related to S. sylvaticus but differs in iis larger 

 spikes, lenticular nut, diandrous flowers, and bifid style; that 

 species having shorter spikes, a triangular nut, triandrous 

 flowers, and a 3-cleft style. 



12. BCIRPUS SYLVATICUS, LlJlU. 



Culm triangular, leaf;; umbel doubly compound; involucre 

 many-leaved; spikes ovate, crowded; scales mucronate; sta- 

 mens 3 ; style 3-cleft ; nut triangular, compressed. 



S. sylvaticus, Linn.; Willd. sp. 1. p. 307; Kcem. S^' Schult. syst.2. 

 p. 142; Michx. ! fl. 1. p. 33; Pursh,fl. \. p. 5Q; Richardson, app. to 

 Frank, narr. ed. 2. p. 2. 



