MR. G. BENTHAM ON GRAMINEÆ. 109 
and Festuca are connected by a number of smaller ones, which 
are more variously associated together or separated by European 
botanists than almost any others of the Order. As a whole, 
Festucez should include all the Poacew with two or more perfect 
flowers to the spikelet, which have neither the peculiar inflores- 
cence of Chloride& or of Hordee&, nor the dorsal or twisted awn of 
Avenez, nor the peculiar habit of Bambuseæ. But we have seen 
that there are a few species where the awn is wanting, but which 
must yet be left in Avene; we shall find that in Diplachne, Oreo- 
chloa, and even in Festuca itself, there is occasionally an inflores- 
cence very nearly that of Chloride: ; and with regard to Bambusee, 
distinct as is the habit and foliage of the great mass of genera, yet 
it is exceptional in Planotia, and in the subtribe Centothecee of 
Festuce& there is some approach to that of the Bambusez. The 
subdivisions proposed of the Order into subordinate groups 
have been so various, and often on such plausible (though some- 
times contradictory) grounds, that it is not without hesitation 
that I have selected for adoption the following eight subtribes :— 
Subtribe 1. Pappophoree, has often been raised to the rank of 
a substantive tribe, but with various limits; and it really is only 
distinguished from Triodiee by the more numerous teeth, lobes, 
or awns of the flowering glumes. There are five well-established 
genera, requiring little comment. 
1. POMMEREULLA, Linn. f is a single East-Indian annual, 
with short spikes almost enclosed in the upper leaf-sheaths, and 
remarkable for the presence of two empty glumes between the 
ordinary lower pair and the flowering ones, as in Cfenium, Ere- 
mochloa, Brylkinia, and Uniola. 
2. PAPPOPHORUM, Schreb., has nearly twenty species from the 
warmer regions of both the New and the Old World, distributed 
in two sections, regarded by some as distinct genera :— Poly- 
rhaphis, Trin., a few American species in which the flowering 
glume has thirteen to twenty-three very unequal awns; and 
Enneapogon, Desv., chiefly, but not exclusively, from the Old 
World, in which the flowering glume has nine awns, all nearly 
equal, or five of them rather external and slightly different from 
the four inner ones. 
3. Correa, Kunth, is a single tropical American species, 
differing from Pappophorum in the looser panicle, and in the 
flowers usually more than two, instead of only one or two, in 
each spikelet. 
LINN. JOURN.—BOTANY, VOL. XIX. K 
