116 MR. G. BENTHAM ON GRAMINE. 
29. AvELLINIA, Parlat., isa single West-Mediterranean annual 
with the habit of Schismus, and placed by Savi in Bromus, by 
Gussone in Avena, and by DeCandolle in Keleria. It is well 
marked amongst Eragrostes by the outer glumes, of which the 
lowest is almost reduced to a bristle, and the second broad, mem- 
branous, and the largest of the spikelet ; the flowering glumes 
awned. 
30. EaTowia, Rafin. (Reboulea, Kunth, Colobanthus, Trin.), 
two or three closely allied North-American species, with the 
second empty glume the largest of the spikelet, as in Avellinia; 
but the habit is very different and the glumes all unawned. 
31. DISSANTHELIUM, Trin. (Phalaridium, Nees, Stenochloa, 
Nutt.), comprises two, or perhaps three, species from the Andes 
of South America and the coasts of Mexico and California, 
figured and described in the last part of Hooker’s Icones. They 
have most of the characters of Schismus, but, besides the widely 
distant geographical stations, they differ in the nerves of the 
flowering glumes always three, not five. 
32. Moum, Meench ( Enodium, Gaudin), a single well-known 
European and temperate Asiatic species, and 33. SPHENOPUS, 
Trin., a very pretty little Mediterranean annual, require no fur- 
ther comment on the present oecasion. 
34. CaTaBRosa, Beauv., can only be distinctly characterized if 
reduced to the single C. aquatica, Beauv., placed by some authors 
in Aira, by others in Glyceria. In it the three nerves of the 
flowering glume characteristic of Eragrostezm are very promi- 
nent. The two or three Oriental species added to it by Trinius 
belong to the genus Cowpodıum. | C. antarctica, Hook. f., is a Triodia. 
C. glaucescens, Phiippi, and C. magellanica, Hook. f., are true 
Glyceric. 
35. Eracrostis, Beauv., an almost cosmopolitan genus of 
above eighty species (multiplied by Steudel and others to about 
two hundred and fifty), is a very natural one so far as the great 
majority of species are concerned, and distinctly limited if we 
include the three-nerved glumes amongst the essential characters. 
Yet in other respects there are exceptional species which have 
been variously referred, even by modern botanists, to Poa, Fes- 
tuca, Briza, Dactylis, Eleusine, or Leptochloa, which they in some 
measure approach respectively ; and some have been proposed as 
substantive genera; but it has appeared to me that the genus 
may be best defined if retained entire, dividing it into the six 
