North Ameilcan Cyperacea:. 433 
Obs. This plant much resembles C. sfrigosus in its tall 
slender culm, and in the elongated rays of the umbel ; but in 
the structure of the spikelets, it is nearer C. Mlchauzianus ; yet 
it may prove to be distinct from either. 
C. STEXOLEPis, p. 363. Texas. T. Drummoiid ! 
C. REPENS, p. 264. Martha's Vineyard, and Nantucket, 
Massachusetts, Mr. Oakes ! ; West Haven, Connecticut, Dr. 
Robhins ! 
After this species insert the following : 
Cyperus lutescexs, Torr. ^^ Hook. 
Umbel simple, 5 — 6-rayed ; involucre 3-leaved, about as 
long as the umbel ; spikelets 1-5 — 20 on each ray, someuhal 
distichously inserted, spreading horizontally, linear, 30 — 40- 
flowered ; scales oblong, mucronulate, 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, sniooth, firm. Leaves 3 lines wide, 
very smooth, becoming yellowish in drj'in!?. Umbel large, the rays 
2 — 3 inches long, erect. OchrecB 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, 
except 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. repens ; 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. Drummond ! (N. Orl. Coll. no. 309, bis.) 
Some of the specimens from Macon are two feet high ! 
