ME. G. BENTHAM ON GEAMINE^. 133 



minent lower margin of the notches of the rhachis as a rudimen- 

 tary glume. 



8. Kealikia, Coss. and Dur., is a single Algerine species 

 unknown to me, but well described, and evidently rightly placed 

 in the present group. 9. Oeopetium, Trin., is a dwarf East- 

 Indian species remarkable for the cylindrical spike, with per- 

 fectly immersed spikelets as in some MottloelUas and Ophiurus, 

 but with the outer persistent glumes of Hordeese. 



The third subtribe Eh/mecB comprises three genera, in which the 

 spikelets are two or more, collaterally sessile at each notch of the 

 spike, or the lateral ones very shortly stipitate. 



10. HoBDJsrM, Linn., was restricted by Beauvois to the common 

 cultivated barley, S. vulgare, Linn., which in a great variety of 

 forms is of very ancient cultivation, and whose indigenous origin 

 is no more known than that of our wheats. Amongst these 

 forms the East-Indian H. agiceras, Eoyle, has been proposed by 

 E. Meyer as a genus under the name of CritJio ; but it cannot be 

 otherwise considered than as a luxuriant monstrosity. The really 

 spontaneous species of Hordeiim amount to about twelve, distin- 

 guished from Mymus by the single flower in each spikelet, and 

 distributed into three sections: — 1. Zeocriton, Beauv. (Critesion, 

 Eafin.), for the S. mttrinum, H. hulhosum, H.jubatum, Linn., and 

 some others, in which the central spikelet alone of each three is 

 fertile, the lateral ones sterile or reduced to empty glumes ; 

 2. OritJiopsis, Jaub. and Spach (sect. Medusather of Elymus, 

 Grriseb.), for the H. crinitum, Desf., and its allies, with two per- 

 fect spikelets at each notch, the intermediate one deficient or 

 rarely represented by one or two empty glumes ; 3. Ouviera, 

 Koel., for the H^ sylvaticum, Huds. (Ulymus eurojpceus, Linn.) , 

 with three collateral spikelets. 



11. ELTMrs, Linn., as now generally limited, comprises about 

 twenty species, distributed into three sections, all distinguished 

 from Sordeum in having two or more flowers to each spikelet : — 

 1. Sitanion, Eafin. {Polyantheriie, Nees), for the North- American 

 M. Sitanion, Schult., with the flowering glumes usually three- 

 awned; 2. Glinelyna, Griseb., with the spikelets usually two only 

 to each notched and the flowering glumes with one long awn ; 

 and 3. Fsammelyna, Griseb., taU rigid species with often more 

 than two spikelets to each notch, and the flowering glumes un- 

 awned or with only very short awnUke points. 



LIHN. JOTJEir. — BOTANT, TOl. XIX. M 



