434 North American Cyperacece. 
Cyperus setigerus, Torr. ^'' HooJc. 
Culm triquetrous above, firm ; umbel compound, 7 — 9- 
rayed ; the primary rays elongated, erect ; secondary spread- 
ing widely ; involucre 3-leaved, ver}- long ; involucels seta- 
ceous, shorter than the secondary rays ; spikes composed of 
12 — ] 6 spikelets distichously arranged ; spikelets lanceolate, 
about 10-flo\vered ; scales lanceolate, mucronulate, appressed, 
3-nerved ; interior scales adnate, conspicuous ; stamens 3 ; 
nut linear-oblong. 
Culm 4 feet high, acutely triangular, smooth. Leaves nearly as long 
as the culm, about 3 lines wide, flat. Umbel erect. Primary rays 3 — 6 
inches long. Ochrea; entire. Involucre 4 times as long as the umbel. 
Involucels very slender, tortuous. Spikelets inserted in a distichous 
order along the upper part of the secondary rays, compressed, acute. 
Scales tinged with brownish red, somewhat carlnate, the tip pointed 
with a very short straight mucro. Interior scales membranaceous. 
Mature nut not seen. 
Hab. Texas, T. Drummond ! (Coll. I. no. 315, and 
Coll. m. no. 453.) 
Obs. This is quite distinct from any other Cyperus in my 
herbarium, and appears to have been hitherto undescribed. It 
has some resemblance to C. longus of Europe. 
C. DissiTiFLoitus, p. 266. New Orleans (no. 389) and 
Texas, (Coll. III. without a number.) T. Drummond ! 
C. FiLicuLMis, p. 267. Texas, T. Drummond! (Coll. 
I. no. 347.) 
C. Grayii, p. 268. Martha's Vineyard, and Nantucket, 
Massachussets, abundant, Mr. Oakcsl 
C. Baldwinii, p. 270. New Orleans, (no. 292, & 286) 
and Texas, T. Drummond ! The ticket belonging to the 
Texan specimen was misplaced ; but I believe it was no. 
346 of the first collection. 
