266 POACE.E. 



ligule lascerate, 1.5 mm. long; bludes of the culm scabrous, erect, 

 setaceous, 6-10 cm, loug, those of the sterile shoots about 1 cm. 

 long. Panicle narrow, thinly spikelike, 10-15 cm. long, rays 

 mostly in twos, apj^ressed, flower-bearing at the base, the longest 

 3-5 cm. long, branches closely flowered. Spikelets on very 

 short pedicels or sessile; empty glumes equal, ovate-lanceolate, 

 acuminate or awl-pointed, 1-nerved, 2-2.5 mm. long; floral glume 

 sparingly hairy at base, linear-lanceolate, 3-nerved, about 4 mm. 

 long, the awn 8-12 mm. loug; palea linear, nearly as loug as its 

 glume. 



New Mexico, U. S. Bepf. AgricnI. from Yasey, 



New Mexico and Arizona, on rocky hills and mountain-sides. 



56. M. longiglumis Yasey, Contrib. U. S. Nat. Herb. 1 : 283 

 (1893). 



A rather slender tufted unbranched light green perennial, 

 60-100 cm. high. Culms solid. The uj)per sheaths sj)reading f rom 

 the culms and involute; ligule thin, decurrent, and 5-8 mm. long; 

 blades of the sterile shoots conduplicate, scabrous, thickly clothed 

 with silky hairs, 30-40 cm. long, 2 mm. wide, those of the culm 

 about 3 mm. wide. Panicle often purplish, slender, loosely spike- 

 like, 20— 40 cm. long; rays scattered, numerous, appressed, sparing- 

 ly branched, the longest about 4 cm. long, bearing 5-8 scattered 

 spikelets. Spikelets on pedicels mostly about 1 mm. long; empty 

 glumes scabrid or puberulent, thin, subequal, lanceolate, obscurely 

 1-nerved, 5.5-6 mm. long; floral glume ovate-lanceolate when 

 spread, obscurely 3-nerved, 4-5 mm. long, 2-tootlied, awn 2-6 cm» 

 long; palea acute, as long and as broad as its glume. Anthers 3 

 in number, nearly 3 mm. long. 



Mexico, Palmer 766, Pringle 2365. 



57. M. Trinii Fourn. Hemsl. Biol. Centr. Am. Bot. 3:543 

 (1880). Bracltydytrum Pringlei Yasey, ined. 



A very slender diffuse grass, 20-40 cm. high. Sheaths and 

 nodes mostly pubescent; ligule ciliate, less than 1 mm. long; blades 

 mostly imbescent, flat, acuminate, 2-4 cm. long, about 2 mm. wide. 

 Panicle terminal and axillary, the latter mostly enclosed by the 

 sheaths, the former exserted, 8-12 cm. long. Spikelets racemose 



