84 ME. G. BENTHAM ON GEAMINEiE. 



10. EcHiKOPOGON, 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. Diplopo&oit, 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. Amphipogoit, Br. (.^yqpo- 

 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. Gamelythrmn, Nees, is the A. turbinatus, Br., separated 

 from Ainphipogon only on account of a more distinct elongation 

 of the rhachilla between the outer glumes and the flowering 

 one. 



13. Heleochloa, 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 Orypsis ; and Host himself subsequently assented 

 to the union, probably misled by an apparent resemblance of some 

 varieties of H. schaenoides to the true Orypsis aouleata ; but the 

 resemblance is apparent only, the two genera are as essentially 

 difierent in inflorescence as in the structure of the spikelets. 

 The axis of inflorescence, or receptacle, in Crypsis is a flat disk ; 

 in Seleoeliloa it is a more or less elongated linear rhachis, cylin- 

 drical even in those varieties where the spike-like panicle is con- 

 tracted into a sessile head. In Crypsis the empty glumes are 

 above the articulation and fall off" with the spikelet, and the 

 glumes are quite those of Oryzese without any two-nerved palea ; 

 in Heleochloa the empty glumes persist below the articulation, 

 and the glumes and palea are entirely those of Phleoideae ; and 

 although in the commonest species the spikelike panicle or head 

 is short and sessile, yet there are others where it is long, narrow- 

 cylindrical, and pedunculate. Pliizocephalws, Boiss., founded on 

 Crypsis pygmcea, Jaub. and Spach, makes, with O. amligua and 

 C. crucianelloides of Balansa, a very good section of Seleochloa, 

 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 Sporoholus and a Phleum. 



14. Mailiba , Parlat., is the Phalaris crypsoides, Durv., a dwarf 



