MR. G. BENTHAM ON GEAMINEiB. 129 



and Stenohromus. 3. Zeohromus, Griseb. (Serrqfalcus, Parlafc.), 

 spikelets usually broad and thick, the flowering glumes awned, 

 and the nerves of all the glumes more numerous than in the pre- 

 ceding sections. Libertia, Lejeune {Michelaria, Dumort.), is the 

 B. ardennensis, Kunth, differing from S. (Zeohromus) secalinus in 

 the lateral lobes or teeth of the flowering glumes produced into 

 slender points or very short awns. Triniusa, Steud., is the B. 

 DanfhonicBjTnn., very near B. (Zeohromus) macrostachyus, Desf. ; 

 but most of the flowering glumes, especially the upper ones of 

 the large spikelets, bear three long recurved awns. 4. Cerato- 

 chloa, DC. (or Beauv.), three or four American species, extra- 

 tropical or Andine, with flat spikes not unlike those of Uniola, but 

 at length often thickened as in Zeohromus, and the flowering 

 glumes scarcely notched at the end, and the awn very short. 

 Fouruier rightly retaios the 5. (Ceratochloa) purgans, Linn., in 

 5roMMS (under the name of B. Hooheri), but keeps up the genus 

 Ceratochloa for the original C unioloides, DC, as having the 

 lodicules connate. I have examined a number of specimens, both 

 wild and cultivated, and have always found the lodicules attached 

 by a broad base and contiguous, but quite free or only exceedingly 

 shortly cohering at the very base. 



70. BBACHTPODirM, Beauv. {Hemibromus, Steud.), has five or 

 six European or temperate- Asiatic species, one or two of which 

 are also in Mexico, Colombia, and tropical and southern Africa. 

 They closely connect Festuca with Agropyrum ; the spikelets are 

 those of the former though usually longer, and the simple spicate 

 inflorescence is that of Agropyrum, except that the rhachis is not 

 articulate and not at all or scarcely notched, and the spikelets are 

 not so closely sessile, usually few and distant. TracTiynia, Link, 

 is B. distacJiyum, Uoem. and Schult., which differs from the rest 

 of the genus as an annual, with only one or two spikelets at the 

 end of the peduncle. 



Tribe XIII. Hoedee2B. 

 This tribe, one of the most definite of the Poacese, is charac- 

 terized chiefly by the inflorescence. The spike is always simple, 

 except in abnormally luxuriant cultivated varieties or monstrosi- 

 ties, the rhachis notched and often, but not always, articulated, 

 the spikelets (one- or several-flowered) singly or two or more 

 collaterally sessile at each notch. The genera, mostly very dis- 

 tinct, belong to the temperate regions of the New as well as the 



