No. 11. 

 ORYZOPSIS FIMBRIATA Hemsl. (Stipa fimbriata Kth.) 



Culms tufted with many root leaves at base, erect, striate, smooth, slender, 1 to 

 2 feet tall. 



Leaves of stem 2 to 4; lower sheaths much shorter than internodes, closely 

 wrapping the culm with the niembranaceous inner fold; blade filiform, involute, 

 ^ line wide, 1 to 3 inches long, much exceeded by the in volute setaceous root leaves; 

 ligule conspicuous, obtuse, wider than blade, 1 line long. 



Inflorescence a loose, erect, or spreading panicle, 4 to 6 inches long; rachis angu- 

 lar, slightly scabrous, flexuous towdrd apex, branches in twos or threes, spreading 

 or lower ones even deflexed, filiform, 1 to 2 inches long, each bearing 2 to 4 spike- 

 lets on pedicels 3 to 5 lines long. 



Spikelets obovate, 2 to 2$ lines long; first glume broadly lanceolate, upper 

 half scarious with acuminate apex, often purplish, 5-nerved, smooth, 2 to 2% lines 

 long; second glume same but slightly smaller; floral glume coriaceous, orbicular, 

 obscurely 5-nerved, covered with loose white hairs longer at base, and bearing a 

 smooth flexuous awn 5 to 8 lines long; palet obovate, acuminate, 2-nerved, 1| lines 

 long. 



PLATE XI; a, spikelet dissected and enlarged; b, panicle at maturity. 

 Texas, New Mexico, and Arizona. 



