Mo7iograph of North American Rhynchos'porcB. 219 



ing as if surrounded with a thickened margin, smooth, obovate, very 

 broad at the summit, attenuate at the base as if raised on a short stipe. 

 Tubercle subulate, compressed, as long as the nut. 



Hab. Pine barrens of New Jersey and on Long Island about 

 Babylon, Torrey ; Wilmington, N. Carolina, Mr. Curtis; 

 Georgia, jLc Conte ; New Orleans, Dr. IngaJls ; Gadsden 

 County, Middle Florida, Dr. Chapmaii. 

 Obs. This interesting species was discovered by Prof. Torrey 

 several years since, in the pine barrens of New Jersey and 

 on Long Island ; and as in these localities it occurs, for the 

 most part, with only two heads, it received the name of R. 

 biceps. Our specimens from the southern states, however, 

 have uniformly more than two heads, and often six or seven. 

 I have therefore ventured to substitute for the manuscript 

 name of Professor Torrey, one which is in a good degree 

 characteristic of the habit of the species. This plant is 

 very closely allied to R. glomerata, but is much larger and 

 stronger in all its parts. Its larger and margined nut, and its 

 more ample, and for the most part, spherical heads, will suf- 

 ficiently distinguish it from that species. A most remarka- 

 ble circumstance with regard to this species, and so far as 

 my observation extends, peculiar to it, is the diversity in the 

 direction of the hispidness of the bristles : even in different 

 individuals from the same cluster some of the bristles are 

 hispid upward and others downward. With this single 

 exception, the direction of the hispidness of the bristles is, in 

 each species of this genus, perfectly constant. 



Species inquirenda. 



Schtenus axillaris, " culmo triquetro, folioso ; corymbis minimis, alternis, 



axillaribus; spiculis confertis." Lam'k. III. Gen. I. p. 137. 

 Hab. Carolina, D. Eraser. — Lamarck. 



