154 Descriptions of some new Grasses. 



Cor. two-valved, shorter than the calyx ; inferior valve 

 terminating in a slightly contorted awn three times its length. 



Stamens . 



Styles two ; stigmas plumose, purple. 



Abortive fl. on a distichously bearded pedicel, minute, one- 

 valved, awnless ; sometimes with the rudiment of a superior 

 valve. 



Hab. On the Canadian river. 



This species is allied to Erianthus, and is remarkable for 

 its whitish and very villous flowers. It much resembles an 

 anonymous species figured by P. de Beauvois, Agrostograph. 

 t. 23. f. 3. 



6. Trisetum airojdes. P. de Beauvois. 



Panicula subspicata, arista demum reflexa, calycem exce- 

 dente. Roem. and Schult. Syst. Veg. II. p. 666. Aira sub- 

 spicata L. Willd. spec. pi. I. p. 337. Fl. dan. t. 228. 



Hab. On the Rocky Mountains. 



I have compared this with European specimens from Swe- 

 den and Germany, and find them to agree in every respect. 

 It has not been hitherto recorded as an American plant, though 

 I have received specimens of it from Dr. Bigelow, collected 

 on the White Hills of New-Hampshire. 



7. Aristida fasciculata.* 



Culm filiform, erect, branched ; leaves narrow, flat, smooth ; 

 panicle elongated, sub-spiked ; flowers fasciculate ; calyx 

 shorter than the corolla ; awns nearly equal, spreading, longer 

 than the flower., 



DESCRIPTION. 



Culm two feet and more in height, smooth, terete, with shon 

 branches, slightly geniculate. 



