168 



Fig. 162. TRISETUM INTERRUPTX7M Buckl. Proc. Acad. Nat. Sci. Phila. 

 1862: 180. 1862. SLENDER OAT-GRASS.— A slender, erect annual 2-5 dm. 

 (8'-20') high, with rather short, soft leaves and narrow, elongated panicles 4-10 

 cm. (Is'-l') long. Culms densely pubescent, with short reflexed hairs below 

 the nodes, otherwise smooth; sheaths loose, pubescent, shorter than the inter- 

 nodes; ligule hyaline, obtuse or truncate, 2 mm. (1") long; leaf-blades mostly 

 I)lane, pubescent. Spikelets (a) 2- to 4-flowered, 4-5 mm. (2"-2^") long ; empty 

 glumes (a) equal, broadly oblanceolate, acute; flowering glumes (b) equaling 

 the empty glumes, cleft at the apex, bearing a scabrous awn about 8 mm. (4") 

 long.— Colorado to Texas, Arizona, and southern California. .March to May. 



