North American Cyperacccc. 433 



Obs. This plant much resembles C. strigosus in its tall 

 slender culm, and in the elongated rays of the umbel ; but in 

 the structure of the spikelets, it is nearer C. Michauxiamis ; yet 

 it may prove to be distinct from either. 



C. STENOLEPis, p. 363, Texas. T. Drummond ! 



C. REPENS, p, 264. Martha's Vineyard, and Nantucket, 

 Massachusetts, Mr. Oalccs ! ; West Haven, Connecticut, Dr. 

 Rohhins ! 



After this species insert the following : 



Cyperus lutescens, Torr. ^'' Hook. 



Umbel simple, 5 — 6-rayed ; involucre 3-leaved, about as 

 long as the umbel ; spikelets 15 — 20 on each ray, somewhat 

 distichously inserted, spreading horizontally, linear, 30 — 40- 

 flowered ; scales oblong, rnucronulate, rounded on the back, 

 strongly nerved, closely imbricated, but free at the apex ; in- 

 terior scales narrow, adnate ; nut obovate-oblong, 



"Culm 18 inches high, triquetrous, smooth, firm. Leaves 3 lines wide, 

 very smooth, becoming yellowish in drying. Umbel large, the rays 

 2 — 3 inches long, erect. Ochreee short, loose, bidentate. Spikelets 

 more than an inch in length, one line broad ; upper ones alternate ; the 

 lower ones somewhat fasciculate. Scales light brown, closely appressed, 

 «xcept near the summit which is very slightly turned outward, so that 

 the spikelets have a serrated appearance. Stamens 3. Style 3-cleft. 

 Nut triquetrous. 



Hab. Texas, T. Drummond ! (Coll. III. no. 452.) 



Obs. Resembles C. repcns ; but the spikelets are much 

 longer and broader, and the flowers much more numerous ; 

 the scales are also narrower, and the involucre much shorter. 



C. Hydra, p. 365. Newbern, North Carohna, Mr. 

 Croom ! ; Macon, Georgia, Dr. Loomis ! ; near New Orleans, 

 T. Drummojid! (N. Orl. Coll. no. 309, bis.) 



Some of the specimens from INIacon are two feet high ! 



