98 MR, Œ. BENTHAM ON GRAMINE EX. 
and the lower empty glumes with only one or three, or the second 
rarely with five nerves. 
10. GAUDpINIA, Beauv., two species, has the spikelets of Avena 
CAvenastrum) ; but they are singly sessile in the notches of the 
articulate rhachis of a single spike, thus showing the inflorescence 
of the tribe Hordez, 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 G. fragilis, Beauv., is widely dispersed over the Mediter- 
ranean region. The second species, G. geminiflora, J. Gay, was 
proposed as a genus Arthrostachya, Link, from garden specimens of 
unknown origin; it has since been detected by Seubert in the 
Azores. 
11. AMPHIBROMUS, Nees, is a single Australian species, with 
many-flowered spikelets. The grain is furrowed as in Avena, but 
glabrous and free from the palea as in Trisetum. 
12. ARRHENATHERUM, Beauv., contains three European, North- 
African, or Oriental species, often included in Avena, but differing 
from that genus as well as from most Poace: 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 
Avene. 
13. Trisracnya, 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 Arrhenatherum, 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 Trichopterya. 
14. TRICHOPTERYX, Nees ( Loudetia, Hochst.),about ten African 
species, of which one is also in Brazil, has the spikelets of Tri- 
stachya; 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. flammea, has, as already men- 
tioned, been rather negligently published and figured as an 
Arundinella, 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 8 
