MR. G. BENTHAM ON GRAMINEX. 111 
chloris, but with the spikelets of Triodia. Trichoneura, Anders., 
is Leptochloa Lindleyana, Kunth, from the Galapagos Islands, 
with the habit nearly of Diplachne fascicularis, but with the 
characters of Zriodia. Leptochloa mollis, Kunth, from Senegal, 
which I have not seen, would appear from his figure to be a 
Triodia, near to the H plumosa, but with the loose panicle of 
T. Lindleyana. Rhombolytrum, Link, is T. filiformis, Nees, a 
Chilian species, very near to the North-American T. albescens, 
and 7. trinerviglumis, Munro, and also to 7. Kerguelensis, 
Hook. f., and T. antarctica (Catabrosa antarctica, Hook. f.), from 
extreme southern America. 
7. DırLAcHNE, Beauv., now comprises about fourteen species, 
dispersed over the tropical and temperate regions both of the 
New and the Old World, and variously referred to Priodia, 
Leptochloa, or Molinia by different agrostologists ; and the genus 
is really closely connected with the two first-named, but more 
especially with the Triodie of the typical section Uralepis. 
From these it chiefly differs in inflorescence: the branches of 
the paniele are long and slender; the spikelets, almost linear, 
scattered along the rhachis and sometimes sessile or nearly so 
in two rows, but not regular and unilateral enough to place the 
genus in Chloride&, to which it is sometimes referred. The cha- 
racteristie teeth of the flowering glumes are also sometimes very 
minute. Whatever position, therefore, we give to the genus, it 
must be more or less an arbitrary one; but that next to Triodia 
seems the least objectionable. 
8. TrıpLasıs, Beauv. ( Diplocea, Rafin.), has two North-Ameri- 
can species ( Uralepis cornuta, Ell., and U. purpurea, Nutt.), with 
a narrow, slender, slightly-branched panicle, and the flowering 
glumes deeply divided into three narrow lobes, the central one a 
slender awn. The South-American Triplasis setacea, Griseb., is 
a Diplachne (D. spicata, Doell). 
9. Scteropogon, Philippi (Lesourdia, Fourn.), has four species, 
one from Chile, the others from the Mexican-Texan region, all 
remarkable for the unisexual spikelets, those of the two sexes so 
different in aspect that without positive evidence it would have 
been difficult to suppose them to belong to the same plant. The 
Mexiean ones have been very well described and one of them 
figured by Fournier, who, from his specimens, supposed them to 
be strictly dicecious ; but we have specimens with the two in- 
floreseenees upon different branches of the same individual. 
K 2 
