102 MR. G. BENTHAM ON GRAMINEZ, 
7. CELORIS, Sw., contains about forty species, dispersed over 
the warmer regions both of the New and the Old World. It is 
for the most part a natural genus, with two or more spikes digitate 
at the end of the pedunele, the one-flowered spikelets in two 
regular close rows as in the allied genera, the flowering glume 
usually awned, and one, two, or more empty glumes above it but 
these characters are not constant, aud the structure of the spike- 
lets is somewhat polymorphous. C. monostachya, Pourr., from the 
Mascarene islands, and C. unispicea, F. Muell., from Australia, 
are slender plants with only one or rarely two spikes, and the 
flowering glume as well as the upper empty one are narrow and 
awned. In C. aciculare, Br., and C. Roxburghiana, Edgew., from 
East India and Australia, and C. radiata, Sw., from America 
and Africa, the glumes are likewise narrow and awned, or the 
upper empty one reduced to a mere awn, but the spikes are nor- 
mally several and digitate. C. foliosa, Willd., has also a narrow 
awned flowering glume ; but the upper empty one is a double awn 
(or two awnlike glumes), and the spikes are not so closely clus- 
tered at the end of the peduncle, on which account Doell has 
transferred the species to Gymnopogon, from which it appears to 
me to be much further removed. In C. pumilio, Br., C. pectinata, 
Benth., and C. divaricata, Br., all from Australia, the flowering 
glume is distinctly two-lobed with the awn between the lobes. 
In a considerable number of species the upper empty glumes are 
broad and truncate at the top—these empty glumes being several 
in each spikelet in the Asiatie and Australian species, but one 
only in the American ones. In all the preceding species the 
flowering and upper glumes are awned; in five or six American 
or African species forming the proposed genus Eustachys, Desv, 
(Schultesia, Spreng.), both the flowering and the upper empty 
glume are obtuse and truneate, but without any awn, or only à 
minute point. They are, however, closely connected with the 
typical species of Chloris through C. submutica, Kunth. C. villosa, 
Pers., and C. macrantha, Jaub. et Spach, both of them described 
in detail and figured by Jaubert and Spach, must be transferred to 
Tetrapogon,as having their spikelets with at least two fertile flowers. 
8. TRICHLORIS, Fourn., comprises two Mexican and two extra- 
tropical South-Ameriean species. They resemble Trisetaria in 
their dense oblong crinite panicle and their three-awned flowering 
glumes; but the panicle is composed of simple crowded or verti- 
cillate spikes, and the spikelets, sessile in two rows on the rhachis 
