or THE PEKUYIAK AKDES. 59 



been separated from Agrostisy to wliicli it is in other respects 

 nearly allied, by having ordinarily, though not always, the rliaehilla 

 prolonged to a short point beyond the base of the solitary floret, 

 and by the dense crowded panicle of minnte florets. In both 

 respects the Chicla plant agrees, except that the prolongation of 

 the rhachiUa appears to be of constant occurrence ; but oAving to 

 the presence of comparatively long dorsal awns (which give the 

 plant the appearance of a Polypogoii), and the longer rehitive size 

 of the fertile glume (which is hairy at the base), they are specifi- 

 cally widely different. The Chicla plant may, in technical charac- 

 ters, be thought akin to Deyeuxia^ from which it chiefly differs iu 

 having the short hairs at the base of the fertile glume set on 

 obliq^uely on the outer half, instead of in a complete ring, in tlie 

 awn being straight instead of twisted, and in the extreme short- 

 ness of the prolongation of the rhachilla. But in my 02)inion its 

 true afiinity is with the group of Andine Ar/rostis, of which I 

 have been able to examine A. vireseens, H. B. K., and A.foliata^ 

 Hook, fil. These have the panicle nearly as dense as in our plant, 

 and nearly straight awns. A.foUata, which is the nearest in 

 a2)pearance, diflcrs in having the outer glumes nearly blunt, not 

 acuminate, and much longer than the fertile glume. I have 

 noticed in that species some slight and very short hairs at the 

 base of the fertile glume, but no trace of a prolongation of the 

 rhachilla. I venture to think that the true conclusion from the 

 facts is that the genus Clicetotroj^is should be merged in Agrostis. 



named or a near ally. 



J£, B. K, Chicla ! Either the species 



Wi 



179, var. Above Casapalta, about 14,300 feet, growing by a 

 rivulet, with culms two feet in height ! This diff'ers from Mandon's 

 type specimens in having the culms quite smooth throughout, and 

 wauting the slight hairiness at the opening of the limb of the 

 leaf described by Weddell. The leaves of the sterile shoots are 

 numerous, erect, rigid, tightly rolled into rough wiry cylinders ; 

 the culms have few (two or three) leaves, the sheaths inflated, the 

 ligule long and acuminate. 



DEYErxiA , sp. nov. ? Above Casapalta ! 



Pumila, vix ca?spitosa ; culmis spithamseis, laevibus ; foliis gla- 

 bris, radicalibus brevibus, anguste linearibus, planiusculis, vagiuis 



