ME. G. BENTHAM ON GEAMIMEiE. 113 



Calamochloa, are unknown to me. Tliey are placed by the 

 author in ArundinejB ; but both would appear, from the short 

 character given, to have a rather different iiiflorescence. 



We have formed our fourth subtribe Sesleriece of ten genera, 

 all except the monotypic Elytropliorus extratropical, and con- 

 nected together for the most part by inflorescence as well as by 

 structural characters. These are, however, not without excep- 

 tions. The spikelets are usually collected together in little heads 

 or close clusters, which are themselves closely clustered in a dense 

 globular or spike-like panicle ; and at the base of the head or 

 panicle are usually a few barren spikelets or empty glumes, or, 

 sometimes single glumes, which I have elsewhere, though as I 

 now believe erroneously, designated as bracts subtending the 

 branches of the inflorescence. In two genera the whole inflo- 

 rescence is reduced to two or three spikelets sessile in a cluster 

 of floral leaves. In structure the flowering glumes are variable 

 in their nerves ; but the styles, in almost all the genera, are long, 

 with barbellate or very shortly plumose stigmatic branches, 

 forming an exception to the tribe, which has induced several 

 botanists to refer Sesleria itself to the Panicese, from which it 

 differs so widely in other characters. "We include the following 

 genera in the subtribe : — 



18. MoNANTHOCHLOE, Engelm., is a single Texan species, ano- 

 malous in habit and character, well described and figured by 

 Engelmann. It has been compared to Bitchloe on account of its 

 unisexual spikelets and creeping habit ; but the two sexes in 

 Monanthochloe are very similar to each other, and there is no 

 indication in the inflorescence of any affinity with Chlorideae. 



19. MrrsEOA, Torr., has now three or four species, two or three 

 from extratropical South America having been recently added to 

 the original Mexican-Texan one, figured in the last part of Hooker's 

 Icones. The genus is a perfectly isolated one, showing only 

 some slight affinity with Monanthochloe, especially in the very 

 few spikelets sessile within a cluster of floral leaves ; they are not, 

 however, unisexual as in that genus. 



20. EoHiNAEiA, Desf. (Panicastrella, Moench), a single weU- 

 known Mediterranean species ; 21. Ammochloa, Boiss. {Cephalo- 

 chloa, Coss. & Dur.), two Oriental or North-African species ; 

 and 22. Ueochljsna, Nees, a single South- African species figured 

 in the last part of Hooker's Icones, require no further comment 

 on the present occasion. 



