Nor(h American Cyperaceas. *297 



brislle.s 6, as long as the nut; style S-cleft; nutobovate, strongly 

 biconvex, smooth ; tubercle closely sessile, conical-rostrate, 

 acute. 



Scirpus equisetoides, Elliott, sk. 1. p. 79; Nutt.! gen. 1. p. 32; Ram. 

 and Schult. mant, 2. p. 74. 



S. geniculatus, Pursh, fl. 1. p. 55 1 



Culm H — 2 feet high, of the size of a goose quill; the pith conden- 

 sed at iptervals of about two inches into nodes or false joints; the surfae* 

 slightly roughened with minute papillae, which are depressed in tha 

 centre. SheatJis radical, leafless. Sjnke about an inch long, rather 

 acute. Scales cartilaginous, with a narrow scarious margin ; the lower 

 ones very obtuse ; the upper often somewhat pointed. Bristles retrorsely 

 hispid, as long as the nut without the tubercle. Style 3-clef*; 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, 

 Nuttall! ; Fayetteville, N. Carolina, Schweinitz ! ; St. John's, 

 Georgia, Dr. Baldwin! 



2. Eleocharis quadrangulata, R. Broim. 



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, prodr. 1. p. 224, (in Obs.) ; Ram. 8f 

 ScJndt. 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, enum. 2. p. 253' 

 Spreng. syst. 1. p. 204. 



S. marginatus, Muhl. ! gram. p. 28. 



S. albomarginatus. Ram. S; Schult. ?nant. 2. p. 74. 



Rhizoma thick and creeping. Culm 2—4 feet high and two lines in 

 diameter, clothed at the base with a few purplish sheaths, which some- 



