North American Cyjycracece. 431 



C. Gatesii, p. 255. Middle Florida, Dr. Chajrman! ; 

 Wilmington, North Carolina, Mr. Curtis ! I have also what 

 appears to be the same plant collected near New Orleans, by 

 the late Mr. Drummond, and numbered 388. 



After C. occidentaUs, p. 259, insert the two following new 

 species : 



Cyperus cephalanthus, Torr. SfHool-. 



Culm tall, triquetrous, umbel somewhat simple ; rays -3 — 4, 

 somewhat erect ; involucre 2 — 3-leaved ; one of the leaves 

 very long, the other about the length of the umbel ; spikes 

 ovate, capitate, with short setaceous involucels ; spikelets 50 

 — 80 in each head, linear, about 10-flowered ; the lowest ones 

 fasciculate ; scales lanceolate, remote, pointless, 7-nerved ; 

 interior scales narrow, scarious, minute ; nut obovate-oblong, 

 with a short abrupt point. 



Culm 4 feet high, concave on the sides ; the angles scabrous and very 

 acute. Leaves 2 lines wide, flat. Umbel rather small for the size of 

 the plant; rays 2 — 3 inches long. Ochrees 2-av,'ned. Sjrikes or heads 

 an inch and a half in length, and an inch in diameter, of an ovate form, 

 with one or two setaceous bracts at the base ; the spikelets inserted on 

 all sides of a common rachis, Spikelets half an inch long ; the florets 

 quite distinct. Scales rather acute, ferruginous, Avith a pale green keel ; 

 the sides strongly nerved. Interior scales narrow-lanceolate, adnate. 

 Stamens 3. Nut brownish, dull, two-thirds the length of the keel. 



Hab. Texas, T. Drummond. (Coll. III. no. 445.) 



Obs. The spikelets in this very distinct species are some- 

 what capitate ; but they are inserted on an elongated common 

 axis, and not aggregated at the summit of the rays, as in C. 

 fiUadmis and its allies. 



Cyperus uniflorus, To7-r. ^y Hook. 



Culm filiform, triangular, smooth, leaves very narrow ; um- 

 bel simple, 4 — 5-rayed, erect ; involucre 3-leaved ; the leaves 

 Vol. III. 55 



