108 MR. G. BENTHAM ON GRAMINE £X. 
plants a different habit from that of the several preceding genera. 
The species may be distributed into two rather distinct sections. 
(1) Pseudocynodon, with only one or two flowers in the spikelet, dif- 
fering but little from Cynodon except in inflorescence. To this sec- 
tion belong L.uniflora, Hochst.( Cynodon gracilis, Nees), from Abys- 
sinia, L. Neesi? (Cynodon Neesii, Thw.), from Ceylon, and L. poly- 
stachya, Benth. (Cynodon polystachyus, Br.), from Australia. (2) 
Euleptochloa, with two or more flowers to the spikelet, comprises 
the remainder of the species. "Those which have a point or short 
awn to the flowering glume were formerly generically separated 
by Beauvois under the name of Ziabdochloa. Amongst the pub- 
lished species, L. arabica, Kunth, is the genus Dinebra; D. Lind- 
leyana and L. mollis, Kunth, are referable to Triodia. L. dubia, 
Nees (Chloris dubia, H. B. K.), and the North-American Z. (Di- 
plachne) fascicularis, A. Gray, appear both to be true species of 
Diplachne. Lorentz’s South-American plant distributed by Gri- 
sebach as L. fascicularis appears to be amere variety of Panicum 
sanguinale. L. Wightiana, Nees, is an Eragrostis. L. plu- 
mosa, Anders., is a Triodia. 
There remain three anomalous monotypic genera from the 
Mexican-Texan region— 25. BucnLor (Sesleria, afterwards Calan- 
thera, Nutt.), 26. Jouvra, Fourn., and 27. Orızra, Presl, which 
connect in some measure Chloridee with the subtribe Sesleriex, 
and are all dicecious, and very remarkable for the great dissimi- - 
larity in the spikes and spikelets of the two sexes. Of the first, 
numerous specimens fully confirm Engelmann’s excellent figures 
and description; the other two are unknown to me, and remain 
somewhat doubtful. Of Jouvea, Fournier only knew the female, 
which he says is allied to Buchloe, with a very different habit. 
Opizia is said by him to have the male plant exactly like Buchloe ; 
the female figured by Presl must be very different, though his 
and Fournier’s descriptions do not agree in all points. ' 
Tribe XII. Festucex. 
The large tribe Festucee presents considerable difficulties to 
the systematist. Of the seventy genera on our list (about a 
hundred and ten of some botanists),the greater number are perhaps 
better defined than those of Agrostes for instance, and afford a 
much greater variety of characters; but none of the various 
arrangements proposed for distributing them into groups or sub- 
tribes have proved satisfactory, and the two largest genera Poa 
