118 MR. G. BENTHAM ON GRAMINER. 
species (Z. reptans &c.) which have the spikelets more or less 
unisexual, the males usually flatter, longer, and with more flowers 
than the females; but this separation of the sexes is very 
variable, and not always accompanied by any difference in habit. 
Some species may be occasionally quite dicecious ; in others the 
males and females are in different panicles on the same plant; 
others, again, are variously polygamous; and here, as in the 
Chilian Poe, the character is too inconstant to justify generic 
or even sectional separation. Meyastachya, Fourn., does not in- 
clude E. megastachya, Beauv. 5. Platystachya, includes a few 
African or Arabian species with broad, flat, many-flowered spikelets 
with rather paleaceous glumes, and the rhachilla articulate as in 
Cataclastos. Amongst these Munro would include as Z. genicu- 
lata the Briza geniculata, Thunb., which in its thickened spikelets 
appears intermediate between Briza and Eragrostis, but has the 
prominently three-nerved glumes of the latter. 6. Sclerostachya, 
has three African or Asiatic species. The paleaceous glumes and 
articulate rhachilla are those of Platystachya ; but the spikelets 
are not so broad, and the rigid habit with long and rush-like or 
short and pungent leaves are those of Æluropus. 
36. Ipnum, Philippi, is a single Chilian species unknown to 
me. From the author’s description, it would appear to differ 
from the section Pteroéssa (Cylindrostachye) of Eragrostis in the 
articulate rhachilla and in inflorescence. 
37. CuTANDA, Willk., is a genus proposed for the European or 
North-African Festuca maritima, DC., F. philistea, Boiss, f. 
memphitica, Boiss., F. divaricata, Desf., F. incrassata, Salzm., and 
F. lanceolata, Forsk., which, notwithstanding a general resem- 
blance to Festuca in the shape of the spikelets, could not remain 
in that genus without an essential alteration in its generic cha- 
racter, the glumes being strongly keeled and three-nerved from 
the base. The inflorescence is also peculiar. 
38. Orrocuroa, Link, is a single European mountain species, 
formerly included in Sesleria, which it approaches in its short 
compact inflorescence and the slightly elongated stigmas; but 
there are no barren spikelets, the spike is simple, with almost 
sessile bifarious spikelets like those of some species of Festuca 
(Seleropoa), and the glumes are those of Eragroste&. 
39. Ecrrosra, Br., comprises three or four Australian species 
allied both to Eragrostes and to Melicez, but technically rather 
better placed in the former subtribe. 
