ACJUOSTIDE.E. 251 



laiioeolato, pubescent on the margins, ;3-nerve(l, 2-2.7 mm. long, 

 the awn 1-2-3 cm. long; palca of same shape and nearly as long 

 as its glume. Antliers 3 in number, 0.8 mm. long. 



Arizona, Pn'nr/k in 1884; also, No. 39G, Santa EulaliaMts. ; 

 Mexico (Chihuahua), Priiifjh in 1885; Xew Mexico, Jo //e.s in 1884. 

 West Texas to Arizona. 



25. M. Wrightii Vasey, Coult. Man. Rocky Mt. Bot. 409 

 (1885). 



An erect or vlecum])ent perennial, 30-T5 cm. high. Culms 

 firm. comj)resseil. Sheaths keeled, shorter tlian the internodes; 

 ligule 0.0 mm. long; blades involute, rigid, 8-12 cm. long with 

 filiform tips. Panicle spikelike, cylindrical, densely fiowered, more 

 or less interrupted below, 5-9 cm. long. 4 -G mm. diam. or more 

 slender and interrupted; lower rays spikelike, appressed, 1-2 cm. 

 long. Spikelets often 2-flowered; empty glumes sul)equal, 1-nerved, 

 about 2 mm. long, base thin, ovate, awn-pointed; floral glume a 

 little thi(;ker and longer, very shortly pubescent, 3-nerved, ovate, 

 acute, tipped with a very short stiff awn; palea ovate, acute, nearly 

 as long as its glume. Anthers 1.3 mm. long. 



Arizona, U. S. Dept. Agricnl. 334, from Loiwion ; Mexico, 

 PriiujJe 1419. 



Colorado, New Mexico, Arizona, and Mexico. 

 2G. M. elongata Scribn. iued. 



A dcTisely tufted erect rutlier slender hard-stemmed light 

 green perennial, 80-120 cm. high. Sheaths involute, leaving the 

 culm for a third of their length; ligule lanceolate, 5-8 mm. long; 

 blades rigid, involute, 20-35 cm. long, 0.3-0.8 mm. diam. Pani- 

 cle terminal, often partially included by the sheaths, linear (or 

 spreading (?), 25-35 cm. long, lower rays in clusters of 3-5, branch- 

 ing near the base, and mostly flower-bearing for their entire 

 length, the longest G-8 cm. long. The lateral spikelets on ])edi- 

 cels about 1 mm. long; empty glumes almost hyaline, obscurely 1- 

 nerved. linear, acuminate, second a little the longer, 2-2.3 mm. 

 long; floral glume thin, linear, a pencil-tuft of hairs at the base only, 

 rather abruptly acute when spread, obscurely 3-nerved, 2.3 mm. 

 long; palea acute, a little narrow, but about as long as the glume. 



