Mr. Woops on the Genera of European Grasses. 37 
acute teeth, with an intermediate slender geniculate and twisted dorsal 
awn. Seed without a furrow and without a crest. 
5. Avena. Glumes nearly equal, 2 or more flowered, herbaceous, with a sca- 
riose margin. Outer palea scariose, nerved, ending in two points, with 
an intermediate geniculate and twisted dorsal awn. Seed furrowed, and 
hairy or crested, elliptic-oblong, attached to the inner palea. 
6. Gaudinia. Spicule many-flowered, in two opposite rows on an alternately 
channelled brittle rachis. Glumes very unequal, the longest (superior) 
much shorter than the spicula. 
7. Arrhenatherum. Glumes 2-flowered, the lower barren, with a geniculate 
and twisted dorsal awn. Awn of the fertile floret short and straight. 
Paleæ scariose, the outer ribbed and ending in two points. 
. Holcus. Glumes 2-flowered, the lower perfect, awnless ; the upper barren or 
perfect, with a dorsal awn. Pale without ribs, hardening on the seed. 
. Danthonia. Glumes 2—3-flowered, membranous, as long as the spicula. 
Outer palea quite smooth and coriaceous below, rounded at the back, 
bifid, with a firm, broad, intermediate point, which sometimes becomes 
the base of a geniculate awn. 
oo 
© 
The difference of habit seems to justify the separation of Deschampsia from 
Aira. It has usually the more or less perfect indication of a third floret, which 
is wanting in the latter genus. The straight awn also rising from near the base 
is never wanting, and such an awn is found in no species of Aira. I am ne 
inclined to rest upon this character than upon the 4 teeth of the paleze, ns 
it seems to me, are not cut with such precision as to give much confidence in 
their always occurring in the same number; and similar teeth are not unfre- 
quent in Aira flexuosa. Indeed I find hardly any Grass where this Ade has 
the firmness and regularity exhibited in the figures of = de Beauvois. I 
unite Corynephorus and Airopsis to the remaining species of Ama. The first 
has a distinct and beautiful character in its clubbed awn and the little tall | 
hairs at the genicula, but the habit is that of some species of Aird. 3 
has been separated on its want of an awn, and on the three — - 3 a 
which terminate the inner palea. Yet Kunth says, “ obsolete titona, m 7 
does not indicate a clear distinction. What he considers as genuine Species 
