70 MR. G. BENTHAM ON GRAMINE. 
superior node, These characters, though generally well marked, 
are sometimes more or less obscure. 
17. Vossra, Wall. and Griff., closely connects the Rottboellieze 
with Zschemwn. As in the former, the flowering glume is always 
unawned, and the rhachis of the spike is rigid and deeply notched, 
but the lower empty glume, at least of the pedicellate spikelet, is 
produced into a long point or awn; there are generally several 
spikes or simple branches along the common peduncle, and there 
is in each sessile spikelet a male flower below the terminal fertile 
one, as in Ischemum. The genus was originally established on a 
handsome semiaquatie East-Indian grass, which has since been 
found also in tropical Africa, and two or three additional species 
have reached us from the same country. We should also refer to 
Vossia the Ischemum speciosum of Nees from East India. Eremo- 
chloa, a Japanese plant described by Büse, is unknown to me; but 
the character given, if I correctly understand it, agrees well with 
that of Vossia. 
To the fourth group, or subtribe Euandropogonee, may be 
referred nine genera, in which the two spikelets of each pair are 
heterogamous and the flowering glume of the fertile one is more 
or less awned ; and in the first five the spikelets are in many pairs 
along the rhachis of the simple spikes or panicle-branches. These 
nine genera are increased to twenty-one by Andersson and others, 
whilst Steudel unites seven out of the nine under his Andropogon. 
18. THELEPOGON, Roth (Jardinia, Steud.), comprises one East- 
Indian and two or three tropical-African species, all very elegant 
and closely resembling each other. Their inflorescence is that of 
Vossia, whilst the spikelets are nearer those of Ischemum, but re- 
markable for the rigid tuberculate outer empty glumes. Nees,in 
working up Wight and Arnott’s Peninsular grasses, gave Roth's 
name to a very different grass (Ischemum semisagittatum, Roxb.), 
adding the observation that Roth's description is very bad. The 
fact is, however, that it is Nees who was mistaken in his identi- 
fieation, whilst Roth's description of the true plant is excellent. 
19. Iscr zwvM, Linn. as now understood, has about thirty 
species, widely dispersed over the warmer regions both of the New 
and the Old World, the chief character connecting them being 
that the sessile spikelets have a male flower below the terminal 
fertile one. The spikes are also usually stouter than in Andro- 
pogon, and the genus is a fairly natural one. Beauvois restricted it 
to the Z, muticum, Linn., in which the awn of the flowering glume 
