MR. G, BENTHAM ON GRAMINER. 57 
respeets intermediate between the two groups. The strueture of 
the spikelets, with the two outer glumes very minute or deficient, 
conneets them with the preceding genera; whilst the spicate 
infloreseence and three stamens are nearer those of Alopecurus, 
although the spikes are meh more slender and several on the 
same stem, on long slender peduncles. The genus is confined to 
those of the $a of Steudel’s ‘Synopsis ; the species arranged 
under § b have a very different structure, and form the section 
Beckeropsis of Pennisetum. 
10. Crypsts, Ait. (Antitragus, Gertn.), must be limited to the 
original C. aculeata, which alone has the characters of the tribe. 
All the other species usually referred to it have the 2-nerved palea 
and other characters of the Agrostez, and were well separated by 
Host under the name of Heleochloa. It is true that some short- 
spiked varieties of Heleochloa schanoides have very much of the 
aspect of C. aculeata; but besides the structure of the spikelets 
and the articulation of the rhachilla, they are readily distinguished 
by the rhachis of the spike, which is linear and cylindrical, not flat 
as in Crypsis. 
1l. Conwvcorrz, Linn., is a single Oriental species, very near 
Crypsis, but well characterized by the peculiar inflorescence and 
by the form of the fruiting spike and peduncle, which has supplied 
the generie name. 
12. ALOPECURUS, Linn., including Colobachne, Beauv., and 
Tozzettia, Savi, is a well-known and perfectly definite European 
and temperate Asiatie genus, with the habit nearly of PAleum and 
the structure of the spikelets that of Oryzeæ. Above forty sup- 
posed species have been enumerated; but at least half of them 
must be regarded as trifling varieties of the two or three com- 
monest species, which have now, and perhaps from remote times, 
spread over a great part of the civilized world. 
Tribe IV. TRIsTEGINEZ.. 
This tribe, first proposed by Nees, has been fully adopted and 
much extended by Munro, and now consists of thirteen genera, 
which had been variously scattered in Panicee, Andropogone:, 
and Agrostew, and are really more or less connected with the three 
tribes. They differ from Panicew and approach Andropogone:e in 
the thin, often hyaline texture of the fruiting glume and palea, and 
by the frequent presence of a slender, often bent awn on the 
flowering glume. From Andropogone:e they are chiefly separated 
