202 



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

 Agros., Bull. 11 : 19, fig. ?<. .July, ISMS. Sii.VKU Oat-cuass.— A 

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

 minutely scabrous sheaths and leaves and narrow, silvery gray 

 or ]iurplish panicles 10 to 20 cm. long. .Spikclets 1 to 5 mm. 

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

 minutely scabrous, short-awned lloworing glumes, the tirst one 

 of which is about I mm. long. — Near Silvertou and Twin Lakes, 

 Colorado. August. 



