434 North American CyperacecE. 



Cyperus setigerus, Torr. Sf Hoolc. 



Culm triquetrous above, firm ; umbel compound, 7 — 9- 

 rayed ; the primary rays elongated, erect ; secondary spread- 

 ing widely ; involucre 3-leaved, very long ; involucels seta- 

 ceous, shorter than the secondary rays ; spikes composed of 

 12 — 1 6 spikelets distichously arranged ; spikelets lanceolate, 

 about 10-flowered ; 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. Ochrece 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 ra^^s, compressed, acute. 

 Scales tinged with brownish red, somewhat carinate, 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. ITT. 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. DissiTiFLORUS, p. 266. Ncw Orleans (no. 389) and 

 Texas, (Coll. III. without a number.) T. Drummond ! 



C. riLicuLMis, p. 267. Texas, T. Drummond! (Coll. 

 I. no. 347.) 



C. Grayii, p. 268. Martha's Vineyard, and Nantucket, 

 Massachussets, abundant, Mr. OaJces! 



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. 



