169 



Fig. 163. TRISETUM CANESCENS Buckl. Proc. Acad. Nat. Sci. Phila. 1862: 

 100. 1862. SILVERY OAT-GRASS.— An erect perennial 3-12 dm. (l°-40) 

 high, with flat leaves, and more or less densely flowered panicles 12-18 cm. 

 (5'-7') long. Sheaths rather loose, pubescent, the lower ones exceeding the 

 internodes; ligule truncate, hyaline* about 3 mm. (li") long; leaf-blades 

 linear-lanceolate, plane, scabrous, pubescent, 5-25 cm. (2'-10') long, 5-10 mm. 

 (2i"-5") wide. Spikelets (a) 6-8 mm. (3"-4") long; first glume lanceolate, 

 acute; floral glume (b), cleft one-third from the apex, 6 mm. (3") long: awn 

 attached at the base of the cleft, hispid, about 12 mm. (6") long.— In dry, open 

 ground, open woods, thickets, and wet meadows. California to British Colum- 

 bia, east to Montana. May to September. 



