Mr. Woops on the Genera of European Grasses, 27 
noticed by other botanists, and which I have not been able to find, yet there 
is a small callus, which perhaps is peculiar to this grass, whose nature I do not 
well understand. 
PHLEINE X. 
I separate these from the Phalarideæ on the principle explained by Brown, 
because they have a tendency to produce an interior instead of an exterior 
floret, and also on account of the thinness and delicacy of the pale. Where 
no indication of an interior floret is observable, we are content to notice that 
there is no symptom of an exterior one, and to judge of the tendency by ana- 
logy. There is only one perfect floret in a spicula. The glumes are nearly 
equal, and include the palez. The inflorescence is in a spike-like panicle 
tiled all round, and this, perhaps, forms the most marked distinction between 
this tribe and the Agrostideæ, although the paleæ in the latter tribe have usually 
more consistency. "The genera are: 
1. Achnodon. Glumes boat-shaped, nearly equal, three-ribbed, the lateral 
ones meeting when closed so as to give the glumes a valvular appear- 
ance, and a spindle-like form to the whole spicula. Paleæ 2, nerved, 
filmy, unarmed. 
2. Phleum. Glumes parallel on the midrib, which is prolonged into a seta, 
embracing, and forming an oblong spicula; paleæ 2, nerved, filmy or 
scariose, unarmed. 
. Alopecurus. Glumes membranous. Palea 1, scariose, awned at the back. 
Styles combined." Sm. 
. Crypsis. Glumes and pale membranous, of similar substance and length, 
unarmed. 
5. Gastridium. Glumes membranous, including, acute, awnless, ventricose at 
the base. Paleæ scariose or filmy. The outer truncate; awn dorsal, or 
e 
— 
none. 
The boundaries of the two genera Pareum and Pnaranis have somewhat 
shifted their position since the time of Linnæus. His character of Phleum is 
* Calyx truncatus, mucronatus.” That of Smith, “Cal. of 2 close parallel 
pointed valves concealing the corolla of 2 awnless valves.“ Hooker omits the 
parallelism of the valves, which, however, is a striking character if understood 
E2 
