North American Cyperacea. 297 
bristles 6, as long as the nut; style 3-cleft; nutobovate, strongly 
biconvex, smooth ; tubercle closely sessile, conical-rostrate, 
acute. 
Scirpus equisetoldes, Elliott, sl\ l.p.79; Xutt.I gen. 1. p. 32; Ram. 
and Schult. mant. 2. p. 74. 
S. geniculatus, Pitrsh, fl. 1. p. 55 1 
Culm 11 — 2 feet high, of the size of a goose quill; the pith conden- 
sed at intervals of about two inches into nodes or false joints; the surface 
slightly roughened with minute papilla?, which are depressed in the 
centre. Sheaths radical, leafless. Spike about an inch long, rathei 
acute. Scales cartilaginous, with a narrow scarious margin ; the lower 
ones very obtuse ; the upper often somewhat pointed. JBristles retrorsely 
hispid, as long as the nut without tjie tubercle. Style 3-cleft about one- 
third its length. Nut obovate, tumid,, brown, shining, towards the base 
very minutely striate transversely. Tubercle one-third the length of the 
nut, compressed, black. 
Hab. Bogs, and in water. Near Lewistown, Delaware, 
NiUtall! ; Fayetteville, N. Carolina, Schweinit.z ! ; St. John's, 
Georgia, Dr. Baldwin! 
2. Eleocharis quadraxgulata, R. Browji. 
Culm acutely and unequally quadrangular, three of the sides 
concave, the other wider and flat ; spike cylindrical ; scales 
broadly ovate, very obtuse, bristles 6, as long as the nut ; nut 
obovate, striate, and minutely reticulate ; tubercle conical, com- 
pressed, somewhat free at the base. 
E. quadrangulata, R. Brown, j^rodr. 1. p. 224, (In Obs.) ; Ravi. Sf 
Schult. syst. 2. p. 155. 
Scirpus quadrangulatus, Michx. ! fl. 1. p. 30 ; (not of Muhl. ) ; Pursh, 
fl. 1. p. 55; Elliott! sk. 1. p. 76, t. 3. f . 2 ; Vahl, eman. 2. p. 253? 
Spreng. syst. 1. p. 204. 
S. marginatus, Muhl.! gram. p. 28. 
S. albomarginatus, Rcem. 4* Schult. mant. 2. p. 74. 
Rhizoma thick and creejiing. Culm 2 — 4 feet high and two lines in 
diameter, clothed at the base with a few piirjjlish sheath'*, which «onie- 
