MR. G. BENTHAM ON GRAMINE. 129 
and Stenobromus. 3. Zeobromus, Griseb. (Serrafaleus, Parlat.), 
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 B. (Zeobromus) secalinus in 
the lateral lobes or teeth of the flowering glumes produced into 
slender points or very short awns.  Z'//niusa, Steud., is the B. 
Danthonié, Trin., very near B. (Zeobromus) 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 Zeobromus, and the flowering 
glumes scarcely notched at the end, and the awn very short. 
Fournier rightly retains the B. (Ceratochloa) purgans, Linn., in 
Bromus (under the name of B. Hookeri), 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. Bracnypropium, 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. Zrachynia, Link, 
is B. distachyum, Roem. 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. HonpxrEz. 
This tribe, one of the most definite of the Poaces, 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 
