484 PHANEROGAMOUS PLANTS. 



awn is nearly smooth. In the specimens collected by the Expedition 

 the awns are conspicuously plumose. Bolander states that this species 

 is much esteemed by sheep-growers. 



12. ARISTIDA, Linn. 

 1. Aristida purpurea, Nutt. 



Aristida purpurea, Nutt. in Trans. Am. Phil. S'oc. N. Ser. 5, p. 145. 



Hab. Walla- Walla, Oregon. — A very variable and widely distrib- 

 uted species, forms of which have received specific names ; that in the 

 collection is A. cequimmea, Scheele in Linnsea, 22, p. 343. 



JL3. SPOROBOLUS, i?. Brown. 

 1. Sporobolus cryptandrus, Qray. 



Sporobolus cryptandrus, Gray, Man. (1867), p. 610. 

 Agrostis cryptandra, Torr. in Ann. Lye. 1ST. Y. 1, p. 151. 

 Vilfa cryptandra, Trin. Agrost. 1, p. 49. 

 V. Triniana, Steud. Syn. Plant. Glum. 1, p. 156. 



Hab. Walla- Walla, Oregon. 



2. Sporobolus ramulosus, Kunth. 



Sporobolus ramulosus, Kunth. Gram. 1, p. 68. • 



Vilfa ramulosa, H. B. K. Nov. Gen. & Spec. 1, p. 137, t. 684. 

 Agrostis minutissima, Steud. Syn. Plant. Glum. 1, p. 171. 



Hab. Walla- Walla, Oregon. — This, which is a quite common species 

 further south, we have not seen in any other collection so far north. 

 The glumes are usually fringed at the apex, but there is a variation 

 in this respect as there is in the mucronation of the lower palet, 

 which, in New Mexican specimens, is often distinctly pointed from 

 the prolongation of the mid-nerve. 



