202 



Fig. 498. Trisetum argenteum Scribn. U. S. Dept. Agr., Div. 

 Agros., Bull. 11 : 49, fig. 8. July, 1898. Silver Oat-grass.— A 

 slender, erect perennial, with smooth culms 5 to 7 dm. high, 

 minutely scabrous sheaths and leaves and narrow, silvery gray 

 or purplish panicles 10 to 20 cm. long. Spikelets 4 to 5 mm. 

 long, 1- to 2-flowered, with unequal, acute, empty glumes and 

 minutely scabrous, short-awned flowering glumes, the lirst one 

 of which is about 4 mm. long. — Near Silverton and Twin Lakes, 

 Colorado. August. 



