Monograph of North American Rhynchospora. 215 
23. Rhynchospora sbmiplumosa. 
R. culmo subtereti ; foliis bracteisque setaceis ; spicis approx- 
imatis ad summitatem culmi ; setis sursum hispidis, infra 
medium plumosis, nucem ovatam, laevem, paulo superante ; 
tuberculo compresso-conico, nucem subaequante. 
Culm a foot high, subterete, striate, smooth. Leaves setaceous, shorter 
than the cuhn, scabrous on the margin. Bracts setaceous, surpassing' 
the culm. Spikes 3, oblong, densely flowered, approximate, nearly 
sessile. Sfihelets 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 a» 
the nut. 
Hab. New Orleans. Dr. Ingalls. 
Obs. This species is nearly allied to R. plumosa, 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, retrorsum hispidis, nuce laevi, lenticulari, basi 
subattenuata, longioribus. 
R. alba, Vahl, Emm. II. p. 236. Pursh, Fl. I. p. 49. Elliott, 
Bot. S. Car. Sf Georg. I. p. 57. Ra^m. ^ Schult. Sijst. Veg. 
11. p. 87. Torretj, Fl. I, p. 54. Gray, Gram. iSf Gyp. I. n. 92. 
Schcenus alhus, Lin?i. SjJ. PI. 65. Michx. Fl. I. ji. 64:. MuhU 
Gram. I. p. 5. Bigel. Fl. Bost. p. 17. 
Culm slender, a foot or 18 inches high, glabrous. Leaves setaceous, 
shorter than the culm. Flmvers in close, corymbose clusters, terminal 
