MR. G. BENTHAM ON GRAMINE. 83 
genus the relative size of these glumes appears to vary almost 
from species to species. Vaseya, Thurb., is a Californian species, 
M. comata, Thurb., closely resembling the more common M. syl- 
vatica, Torr., except in the long hairs surrounding the thin 
flowering glume. Podosemum, Desv. (Trichochloa, Beauv.), com- 
prises a number of elegant species, in which the spreading panicle 
has a number of small long-awned spikelets on long capillary 
branches and pedicels. Zosagris, originally separated by Beau- 
vois from Podosemum on account of the long hairs on the back 
of the flowering glume, was subsequently reunited with it by the 
author himself. Clomena, Beauv., is M. clomena, Trin. (JM. nana, 
Benth.), a dwarf Andine species, in which the second empty 
glume is the largest of the spikelet, and rather broadly three- 
toothed. The same character is observable in IL gracilis, Trin., 
forming Nuttall’s genus Calycodon. 
7. BRACHYELYTRUM, Beauv. is a single North-American species, 
very near to some species of Stipa; but the rhachilla is produced 
beyond the flowering glume into a little bristle, sometimes bearing 
à minute rudimentary glume, which does not occur in any other 
species of the subtribe. 8. PERrEILEMA, Presl, contains three 
or four tropical or subtropical American species, with much 
of the habit and many of the characters of Muehlenbergia dif- 
fusa, but with the empty glumes awned as well as the flowering 
one. 
Our second subtribe, PHLEOIDE, is chiefly characterized by the 
inflorescence. The panicle is condensed into a globular or oblong 
head or cylindrical spike ; the rhachilla is, in a few species only, 
produced beyond the flower into a small bristle; the flowering 
glume either is awnless or bears one or three terminal awns, and 
when in fruit is thinner than in Stipes, more loosely enclosing 
the grain as in Euagrostew. The following seven genera, or most 
of them, have already been placed in juxtaposition by various 
Agrostologists. 
9. Lycunus, H. B. K. ( Pleopogon, Nutt.), consists of two closely 
allied American species, perhaps varieties of a single one, readily 
known by the empty glumes as well as the flowering one awned, 
as in Perieilema, the lowest one having usually two or even three 
awns. The long dense cylindrical spike (or spike-like panicle) 
with sterile spikelets intermixed with the perfect ones brings the 
genus in connexion with the subtribe Sesleries of Festucc&; but 
there is never more than a single flower in the spikelet, 
