North American Cyperacece. S6i 
linear, very long. Style slender, 3-cleft. Nut acutely triangular, punc- 
tate. 
Hab. In wet places, particularly in river swamps of the 
Southern States; South Carolina, Elliott!; Georgia, Muh- 
lenberg; New Orleans, T. Drimmond! and Dr. Ingalls! 
Obs. This species is also a native of South America, the 
East and West Indies, and Africa. 
/ /- : 
9. Cyperus bipartitus. 
Spikelet solitary, appearing lateral, ovate-oblong, many- 
flowered; involucre mostly one-leaved, or with an additional 
short setaceous bract ; scales ovate, rather obtuse and coriaceous; 
stamens 2 ; style cleft nearly to the base ; nut biconvex, obovate, 
obtuse, with a papillose surface. 
Annual. Culm triquetrous, 4 — 6 inches high, with two setaceous 
leaves at the base. Spikelet about 14-flowered, half an inch long, 2j 
lines wide, appearing to grow from the side of the culm about an inch 
and a half below the summit, but really terminal and subtended by the 
involucre, which is commonly one-leaved and erect, sometimes two- 
leaved, the second leaf being short and subulate. Rachis naked. Scales 
closely imbricated with appressed points, a sharp keel and 5 pale ferru- 
ginous sides. Style, in the mature flower, cleft nearly to the base, the 
divisions thicker than in most Cyperi. Nut tumid, dark-brown, dull, 
covered with minute papillss. 
Hab. Near New Orleans, Dr. Ingalls ! 
Obs. This species resembles C. mucronatus, Linn, in many 
respects, but the latter is distinguished by having usually several 
spikelets on each culm, a smooth plano-convex nut, and long 
compressed style bifid only at the summit. It is not improbable, 
however, that our plant sometimes bears more than one spikelet. 
10. Cyperus tenellus, Linn.'? 
Culm and leaves setaceous ; spikelet solitary, appearing la- 
teral, lanceolate-linear, 10 — 12-flowered; involucre mostly 
