268 



POACE.E, 



l-nerved; floral glume 3-lo])e{l, ;5— i mm. long, the uwn flfxii- 



081', ',1-5 mm. long; i)alc'ii liiicar, obtuse, 

 ulmost us louj,' its its glume. Authors lin- 

 ear, 1.4 mm. long. 



1'hin soil of dry })orphyry on mountains. 

 Mexico (Chihuahua), I'rinyle 819. 

 2. B. speciosa (Vascy). }fuhlenher(jia 

 sjjeclom Vasey, liull. Torr. Club, 13:231 

 (18Sn). 



A robust erect ])erennial, 00-120 cm. 

 high. Culms, sheaths, and lower side of 

 blades shortly tomentose. Sheaths com- 

 pressed-keeled, longer than the internodes; 

 ligule very short, ciliate; blades scabrous 

 above, involute, GO cm. long more or less. 

 3—4 mm. wide. Panicle 50-(i() cm. lojig, 

 linear; rays numerous, mostly single, 

 branching freely, 8-10 cm. long, llower-bear- 

 ing along the upper three-fourths. Spikclets 

 on pedicels 1-3 mm. long; empty glumes 

 subequal, linear-lanceolate, obtuse or acute, flexuose, nerveless, 

 about 2 mm. long; floral glume pubescent, oval, 2-toothed, 1.7 mm. 

 long, awn 1-1.5 mm. long; palea linear, obscurely nerved, nearly as 

 long as its glume. In texture the glumes and palea are much alike. 

 Anthers linear, 1 mm. long. 



Mexico (Chihuahua), Palmer 301 in 1885. 



52. (lU). BrACHYELYTRUM Ik^auv. Agrost. 39. /. 9. /'. 2 (1S12). 

 Spikclets l-flowered, narrow, with a slemler rudiment of a 

 second llowcr along a groove on the back of the palea in a simple 

 racemose panicle, raclulhi articulate above the lower glumes. Empty 

 glumes nnequal, minute, persistent; floral glume chartaceous, in- 

 volute, rigid, acuminate, 5-7-nerved, oxtemling into a long straight 

 awn; palea sliorter. delicately 2-nerved, with a groove along the 

 back. Stamens 2. Styles short, distinct. (}rain linear, oblong, 

 inclosed, but not adherent. Rachilla ciliolate. 



There is one species and that peculiar to North America; nearly 



Fm. 45. — Bealia Men- 

 cana. a, eiii])ty fjluiues; 

 b, Horet. (Scribner.) 



