290 PROCEEDINGS OF THE ACADEMY OF [1884. 



differ considerably as to width, acuteness and in the presence or 

 absence of the lateral nerves in the second one, they are always 

 very nearly equal in length. In the here-proposed new variety — 

 var. glomerula, from Washington Terr., Frank Tweedy, collector 

 — the equal, one-nerved empty glumes are very narrow, acuminate- 

 pointed and scarcely more than a line in length. The spike- 

 lets in this variety are arranged in dense clusters or glomerules 

 along the extremities of the branches of the very diffuse panicle. 

 A species of Cinna — Xo. 6090 Bolander, N. 22 of the small 

 collection — came into my hands for examination several years 

 ago, and my note at that time was that it was distinct from Cinna 

 arimdivacea, var. pendida^ of Gray's Manual, under which name 

 it was distributed. The past season my attention was again 

 called to this grass by seeing some notes upon it in Dr. Gray's 

 Herbarium at Cambridge, made, if I remember rightly, by Mr. 

 Bentham, suggesting the probability of its being a new species. 

 After careful comparisons with Cinna arundinacea and C. pen- 

 dula, I am convinced that this suggestion is correct, and propose 

 that the species be named Cinna Bolanderi, recognizing the fact 

 that Mr. Bolander, so far as I know, has alone collected it. 



Cinna Bolanderi. 



Spikelets two and a half lines long, empty glumes broadly 

 lanceolate, the upper one three-nerved, subequal, as long as the 

 floret, which is scarcely, if at all, stipitate ; culm stout, seven feet 

 high (in Bolander's specimen), smooth ; sheathes strongly striate, 

 the lower smooth, the upper ones scabrous. Leaves firm in 

 texture, prominently^ striate and scabrous on both sides, those of 

 the middle portion of the culm one to two feet long, and three- 

 quarters of an inch wide, all gradually tapering to a sharp point. 

 Panicle eighteen inches long, loose and widely spreading. 



From the characters above cited, the following synopsis van.y 

 be made of the species in the genus : 



Empty glumes unequal. 



Spikelets 'i\ to 3 lines long. C. arundinacea L. 1. 



Empty glumes equal or nearly so. 



Spikelet less than 2 lines long, floret stipitate. 



G. jwndula Trin. 2. 

 Spikelet more than 2 lines long, floret apparently sessile. 



C. Bolanderi Scribn. 3. 



