DESCRIPTIONS OF TRIBES AND GENERA. 169 



is three-cleft, three-awned, and has two lateral projec- 

 tions. B. Arduennensis Kunth is a species of this sub- 

 genus. 



Sub-genus V. Ceratochloa Beauv. (as a genus). Spike- 

 lets lanceolate, compressed. Both empty and flowering 

 glumes many-nerved, keeled. Ovary with three distinct 

 elevations at the summit. B. unioloides Kunth (B. 

 Schraderi Kunth, CeratocMoa pendula Schrad.). Spikelets 

 6-10-flowered, compressed, arranged in loose panicles, 

 drooping at maturity ; awns very short ; from the "West- 

 ern United States to Chili and the Argentine Republic. 

 A valuable fodder-grass for warmer countries, since it 

 furnishes considerable foliage as early as Januaiy and 

 February. In northern countries it freezes out. Some- 

 times grown for ornament. B. Mango Desv. was, before 

 the introduction of the European grains, the most im- 

 portant cereal of the native Chilians. 



269. (199) Boissiera Hochstetter. Related to the Pap- 

 pophorece by the 5-9 dorsal awns, but is a Bromus as re- 

 gards habit and anatomical characters of the fruit. A 

 low annual with crowded panicles. 



Species one (B. bromoides Hochst.), on the elevated 

 plains of the Orient. 



270. (261) Megalachne Steud. (Pantathera Philippi). 

 A Zeobromus as regards its habit of growth, but with 

 long-awned empty glumes ; flowering glumes awned from 

 the point, faintly five-nerved ; fruit unknown. 



Species one (M. Berteroniana Steud.), upon Juan Fer- 

 nandez. (Union with the Brachypodiece doubtful.) 



271. (264) Brachypodium Beauv. {Hemibromus Steud.). 

 Spikelets many-flowered, narrow, almost cylindrical, in 

 a simple raceme (false spikes) with very short pedicels ; 

 flowering glumes usually awned from the point, edge 

 entire, 7-9-nerved ; palea with stiff-fringed keels ; fruit 

 grown to the flowering glume and palea. 



Species six, in Europe, temperate Asia and its tropical 

 high mountains, in North and South Africa and their 

 central high mountains, rarely in North America. 

 Medium grade fodder grasses. B. pinnatum Beauv. 

 with upright, and B. sylvaticum B. with nodding racemes, 



