380 POACE.E. 



Vur. canescens (Buckl.) T. canescens Buckl. Proc. Acad. Phila. 

 100 (1862). Gray in same 3:57, 



Sl'.eatlis soft, pubescent, first empty glume lanceolate, 5 mm. 

 long, about one-fourth shorter than the second. 



Oregon, Suksdorf 15-i for U. S. Dept. Agricul. 475. 



Alaska to California. 



13. T. Virletii Fourn. Ilemsl. Biol. Centr. Am. Bot. 3:550 

 (1880). 



Culms hard, robust, often 2-3 m. high. Leaves scabrous, 

 upper ligule lacerate-pilose, 5-7 mm. long, blades involute, long- 

 pointed, the upper often extending to the top of the panicle. 

 Panicle oblong, lax or closer, 30-40 cm. long, rays in fives to 

 sevens, glabrous. Spikelets 3-4-flo\vered. 7-8 mm. long, oblong, 

 the hairs half as long as the florets, first empty glume 4 mm. long, 

 second 5 mm. long; floral glume oblong when spread, about 5 mm. 

 long, crosely subacute, not toothed [4-toothed. Fourn.], the awn of 

 all florets attached three-fourths the distance fiom base to ai)cx, re- 

 curved, 3-4 mm. long; i)alea linear, nearly as long as its glume, with 

 two sharp teeth or entire. 



Mexico (Michoacan), PrimjU 3979, "Virl. 1384, MiiU. 651, 

 Bourg. 1149, Sch a ff n. '' Yowrw. 



Cool slopes of mountains near Potzcuaro. 



14. T. PRATEXSE Pers. Syn. 1:07(1805). A. flavescens L. 



Sp. PI. 80 (1753). YeJ LOW OAT-(iUASS. 



An erect smooth glabrous perennial, 30-60 cm. high. Sheaths 

 hairy; ligule truncate, ciliate; blades flat, narrow. Panicle open, 

 oblong, 8-12 cm. long, with slender rays in half-whorls. Spike- 

 lets comjn-essed, shining, often yellowish, 3-5-flowere(l, 5-7 mm. 

 long; first empty glume 1-nerved, 4 mm. long, second 3-nerved, 

 4-7 mm. long; floral glume keeled, 2-cleft, 5-nerved, 4-G mm. long, 

 awn twisted, divergent, 4-7 mm. long, starting two-thirds the way 

 from the base; palea a little shorter than its glume. 



Found in Europe, northern Africa, some parts of Asia, and 

 sparingly introduced into North America. In Great Britain it is 

 cultivated in meadows and lawns. See Vol. 1, p. 191, Fig. 85, 

 under Avenn flnrescens. 



Vermont, Hotiford 23, Prinyle; Michigan, Beul 83. 



