84 MR. G, BENTHAM ON GRAMINE. 
10. EcurwoPoaow, Beauv. ( Hystericina, Steud.), a single Aus- 
tralian and New-Zealand species, has likewise sterile spikelets 
intermixed with the perfect ones; but the empty glumes are 
awnless, and the flowering one three-lobed with the middle lobe 
produced into a long awn. 11. DrProroaox, Br. (Dipogonia, 
Beauv.) also a single Australian species, has a short awn to 
the empty glumes and three to the flowering one, of which the 
central one is long and twisted. 12. AMPHIPO0GON, Br. (ZEgopo- 
gon, Beauv., not of Willd., Pentacraspedon, Steud.), five Austra- 
lian species, has the flowering glume deeply three-lobed and fre- 
quently awned, and the palea also with two rigid almost awn-like 
. lobes. Gamelythrum, Nees, is the A. turbinatus, Br., separated 
from Amphipogon only on account of a more distinct elongation 
of the rhachilla between the outer glumes and the flowering 
one. 
13. HEnEgocuroa, Host (Pechea, Pourr.), contains seven or 
eight Mediterranean species, of which one or two are widely 
dispersed over Europe and Central Asia. Kunth referred them 
to a section of Crypsis ; and Host himself subsequently assented 
to the union, probably misled by an apparent resemblance of some 
varieties of H. schenoides to the true Crypsis aculeata; but the 
resemblance is apparent only, the two genera are as essentially 
different in inflorescence as in the structure of the spikelets. 
The axis of inflorescence, or receptacle, in Crypsis is a flat disk; 
in Heleochloa it is a more or less elongated linear rhachis, cylin- 
drieal even in those varieties where the spike-like panicle is con- 
tracted into a sessile head. In Crypsis the empty glumes are 
above the artieulation and fall off with the spikelet, and the 
glumes are quite those of Oryzeæ without any two-nerved palea ; 
in Heleochloa the empty glumes persist below the articulation, 
and the glumes and palea are entirely those of Phleoides; and 
although in the commonest species the spikelike panicle or head 
is short and sessile, yet there are others where it is long, narrow- 
eylindrical, and pedunculate. Rhizocephalus, Boiss., founded on 
Crypsis pygmea, Jaub. and Spach, makes, with C. ambigua and 
C. crucianelloides of Balansa, a very good section of Heleochloa, 
distinguished by the dwarf tufted habit and the spikelets almost 
echinate with the rigid points of the glumes. Beauvois gave the 
same name Heleochloa to a supposed genus, apparently made up 
of a Sporobolus and a Phleum. 
14. Mate, Parlat., is the Phalaris crypsoides, Dury., a dwarf 
