AOROSTIDE.E. 248 



longer than the internodes; ligulc lanceolate, 10-12 mm. long; 

 leaves of sterile shoots numerous, the blades firm, flat or involute, 

 30-40 cm. long, 2-3.5 mm. wide, those of the culm 2-3 in numljer. 

 Panicles pale straw-colored, strict, 12-18 cm. long, I'ays appressed, 

 single or in pairs, densely flowered to near the base, the longest 4-5 

 cm. long. Spikelets subsessile or on rather stout pedicels, 1-3 mm. 

 long; empty glumes sometimes tinged with purple, lanceolate, first 

 1-nerved, 4-4.5 mm. long, second 3-nerved, 5-6 mm. long, apex 

 sometimes. 3-toothed ; floral glume pilose for the lower two-thirds, 

 rather firm, ovate- lanceolate, 4 mm. long, the awn 12-20 mm. long; 

 palea pilose, narrowly linear, acute, as long as its glume. Stamens 

 3 mm. long. Grain linear, terete, 2 mm. long. 



Arizona, Priiigle. 



New Mexico, Arizona, and Mexico. 



9. M. firma. M. scahra Scribn. n. sp. ined. 



A rather stout erect tufted perennial, 90 cm. high. Ligule 

 firm, acute, 10-18 mm. long; blades firm, closely involute, sca- 

 brous, 20-35 cm. long, pungent pointed, 1-15 mm. diam. Panicle 

 brownish purple, erect, spikelike, the base very thin and inter- 

 rupted, 15-18 cm. long, 1-2 cm. diam. Spikelets olive-brown, 

 empty glumes equal, 3.5-4 mm. long, first 1-nerved, second 2- 

 nerved; floral glume 5-5.5 mm. long, 3-nerved, the stout awn 

 1-2 mm. long; palea nearly as long as its glume. 



The specific name proposed by Scribner had been used by S. 

 Watson, Proc. Am. Acad. 17: 174 (1883). 



Growing at the altitude of 10,500 feet. 



Mexico (Oaxaca), Pringle 4914. 



Scribner identifies it as near M. Palmeri Vasey, from which it 

 differs in having a much longer ligule, second glume two-nerved, 

 floral glume longer, awn shorter. 



10. M. ciliata (H. & K.) Trin. Unifl. 193 (1826). Podosmimim 

 ciliatum H. B. K. Nov. Gen. et Sp. 1 : 128 (1815). 



A very slender geniculate or diffuse light green or reddish an- 

 nual, branching near the base, the culms and leaves more or less 

 pubescent with very short fine hairs. Sheaths half as long as the 

 internodes; ligule a ciliate ring; blades thin, convolute, invo- 



