24.4 GRAiMINEiE. ' [Danthonia 



28. TRISETUM. Br. Ktlu 



1. T. suhspicatum^ Beauv. — Richards, App, ed.2. p. 3. Br. in Parry's 1st Voy, App. 

 p. 292 — Trisetum airoides, B, §- S.—T. molle, Kth.—Gray, Gram, et Cyp, Part II. n. 

 166. — Trin, Act, Petrop — Avena mollis, Mx. 



Hab. Canada. Mx, Labrador* Br Morrison, Rocky Mountains, Dritmmond, to the Arctic Sea-shore 

 and Islands. Dr Richardson, Sir E. Parry.— A. variable plant, in size, from 4 inches to a foot high, in the 

 denseness or laxness of the inflorescence, in the hairiness, and in the more or less purple colour of the glumes. 



2. T. cernuum; panicula laxa nutante, glumis tri-quadrifloris superiore paulo lonfriore 

 (triple latiore,) pilis calli brevibus, racheos medium valvulse attingentibus, perianthiis 

 bisubulatis supra medium longe aristatis, ovario barbato. Trin, in Act. Petrop. 1830. 6. 

 61. Bong. Veg, Sitcha, p. 54 — Avena cernuaj Kunth, Agrost. p. 306. 



Hab. Sitcha. Mertens. Columbia River. Dr Scouler.— Our Scoulerian specimen precisely accords with 

 an authentic one in my herbarium from the Imperial Academy of Petersburg. It is a tall growing 

 grass, 2-3 feet and more high, with leaves more than half an inch broad. The panicle almost a foot long^ 

 the branches slender, drooping, lax, the awn very long and slender, the outer valve of the perianth has the 

 two terminal teeth long, and remarkably slender. 



29. AVENA. Z. 



1. A. versicolor, VilL Belph. 2. p. 142. t. 4./. 5. Kth. Agrost. p. 300.— A. Scheuchzeri, 

 Poll,— Host, Gram. 2. p. 52. 



Hab. Rocky Mountains. Dnemmond.—The only difference I can perceive between these specimens and 

 European ones, is that the panicle is longer (3 to 5 inches) and the spikelets more erect. 



2. A. striata {Mx.) : panicula subsimplici erectiuscula, spiculis 3.4-floris, flosculis basi 

 barbatis superiore saepe tabescente, glumis insequalibus Isevisslmis, perianthii valvula ext. 

 coriacea T-nervia, glabra bicuspidata cuspidibus subulatis, arista subtortili perianthio 

 subduplo longlore, foliis lineari-acuminatis angustis, ligulabrevi truncata. Mx. Am. I. p. 

 23.— Trisetum purpurascens, Torr. FL \.p. 127. Gray, Gram, et Cyp. Part I. w. 46. * 



Hab. Montreal. Paine. (Torrey), Canada to the Saskatchawan and to the Rocky Mountains —The 

 limits between Avena and Trisetum do not appear to be well defined : but the habit of the present species 

 (most distinct indeed in point of specific character) is so much that of the preceding, that I think it more 

 natural to place it with the Avence. 



30. DANTHONIA. De Cand. 



1. D. spicata, R. et S — Gray, Gram, et Cyp. Part II. «, 117. Trin. Ic. Gram. 5. t 

 54. — Avena, L, — PL — Avena glumac^a, Mx. 



Had. Saskatchawan to Hudson^s Bay. Dr Richardson. Drummond. 



