328 North American Cijperaccer. 
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 LEXTICULARIS. 
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, smooth, very obtusely triangular below^ 
heaves 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, Vr. Scolder! 
Obs. Nearly related to S. sijlvaticus but differs in its 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. SCIRPUS SYLA^ATICUS, Liiiir. 
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; Ram. Sf ScliuU. si/st.2. 
p. 142 ; M.ichx. .' fl. 1. p. 33; Prirsh,fi. I. p. 5&\ Riclumhon, npp. to 
^Tank. narr. ed. 2. p. 2. 
