Monograph of North American Rhyiichosjjorce. 213 

 23. Rhynchospora semiplumosa. 



R. culmo subtereti ; foliis bracteisque setaceis ; spicis approx- 

 imatis ad summitatem culmi ; setis sursum hispidis, infra 

 medium plumosis, nucem ovatam, Isevem, pauIo superante ; 

 tuberculo compresso-conico, nucem subcequante. 



Cuhn a foot high, subterete, striate, smooth. Leaves setaceous, shorter 

 than the cuhn, scabrous on the margin. Bracts setaceous, surpassing' 

 the cuhn. Sjnkes 3, oblong, densely flowered, approximate, nearly 

 sessile. Spikelets small, ovate. Glumes ovate, acute. Bristles 6, a 

 little exceeding the nut, hispid upward, plumose below the middle. 

 Stamens 3. Filaments very broad. Style deeply bifid. Nut ovate, 

 compressed, smooth or with a very minute deciduous pubescence. 

 Tubercle compressed-conic, acute, minutely hispid, nearly as long as 

 the nut. 



Hab. New Orleans. Dr. Ingalls. 



Obs. This species is nearly allied to R. pbimosa, but it is 



well characterised by its bristles, which are only plumose 



below the middle, its smooth nut, and long flattened tubercle. 



I regret, however, that I have seen no specimens in which 



the fruit is fully mature. 



24. Rhynchospora alba, Vahl. 



R. culmo superne triquetro ; spiculis corymboso-fasciculatis ; 



setis denis, retroi'sum hispidis, nuce laevi, lenticulari, basi 



subattenuata, longioribus. 

 R. alba, Vahl, Enum. II. p. 236. Pursh, FI. I. p. 49. Elliott, 



Bot. S. Car. ^ Georg. I. p. 57. Rosm. Sf Schult. Sijst. Veg. 



11. p. 87. Torrey, Fl. I, p. 54. Gray, Gram. ^ Cyi?. I. n. 92. 

 Schoenus albus, Lhm. Sy. PI. 65. Michx. Fl. I. p. 64. Mvhl! 



Gram. I. p. 5. Bigcl. Fl. Post. p. 17. 



Culm slender, a foot or 18 inches high, glabrous. Leaves setaceous, 

 shorter than the culm. Floivers in close, corymbose clusters, terminal 



