9 8 MR. e. BEKTHAM ON SKAMINEiE. 



and the lower empty glumes with only one or three, or the second 

 rarely with five nerves. 



10. GrAUDiNiA, BeauY., two species, has the spikelets of Avena 

 {Avenastrum) ; but they are singly sessile in the notches of the 

 articulate rhachis of a single spike, thus showing the inflorescence 

 of the tribe Hordese, to which Parlatore would remove the genus ; 

 but the dorsal twisted awn places it much nearer to Avena, from 

 which some authors would not generically separate it. The com" 

 mon O.fragilis, Beauv., is widely dispersed over the Mediter- 

 ranean region. The second species, Q. geminiflora, J. Gray, was 

 proposed as a genus ArthrostaoJiya, Link, from garden specimens of 

 unknown origin ; it has since been detected by Seubert in the 

 Azores. 



11. AMPHiBUOMrs, Ifees, is a single Australian species, with 

 many-iiowered spikelets. The grain is furrowed as in Avena, but 

 glabrous and free from the palea as in Trisetim. 



12. AEEHENATnEErM, Bcauv., contains three European, North- 

 African, or Oriental species, often included in ^vewa, but differing 

 from that genus as well as from most Poacese in having, as in the 

 two following genera, the lower flower male and the upper one 

 fertile, though the rhachilla is produced beyond it as in other 

 Avenese. 



13. Teistachta, Nees (^Monopogon, Presl), has eight species, 

 of which two are tropical American, the remainder African, tro- 

 pical or southern, one extending to the Levant. "With the lower 

 flower male, as in Arrhenalherum, they are readily distinguished 

 by the spikelets always three together, sessile or equally pedi- 

 cellate at the ends of the branches of the panicle, and by the 

 long twisted awn of the flowering glume being terminal between 

 two lobes or straight awns. Amongst Nees's African species, 

 T. simplex must be transferred to Trichopteryx. 



14. Teiohopteetx, !Nees {Loudetia, Hochst. ), about ten African 

 species, of which one is also in Brazil, has the spikelets of Tri- 

 stacJiya; but they are scattered along the branches of the panicle, 

 not in terminal triplets. The only Brazilian species, not un- 

 common also in tropical Africa, T. fiammea, has, as already men- 

 tioned, been rather negligently published and figured as an 

 ArvAidinella, of which it has none of the characters and not much 

 of the habit. 



15. Anisopogon, Br., is a single "West-Australian species, 

 differing from Danthonia in the large spikelets containing only a 



