102 CLASSIFICATION ACCORDING TO [CH. 
* A glaucous shore plant with long creeping stolons 
(sand-binder). Inflorescence harsh, 5—6 inches 
long. Glumes tapering, simply acute. 
Psamma arenaria, Beauv. 
Elymus, a much rarer sand-binder of similar habit, may lead 
to confusion until the 3—4 flowered spikelets and different arrange- 
ment are observed. (See p. 108.) 
Agropyrum repens (var. junceum) is similar in habit and station, 
but its spikes and spikelets are very different (see p. 107). 
Phleum arenarium is much smaller (see below). 
** Erect. Inflorescence rarely longer than three 
inches. Spikelets flat: glumes keeled, the keel 
suddenly produced into a sharp stiff awn or 
mucronate point. Palee two. 
Phleum. 
+ Tall perennial meadow-grass. Awn bristle- 
like, almost as long as the nearly glabrous 
glume: spike long, cylindrical. 
P. pratense, L. 
tt Small, compact annual shore plant, with the 
glumes acute only and the keel ciliate above. 
Inflorescence not more than 1—1% inch long. 
. P. arenarium, L. 
The rare P. Behmeri, Schrad. has the glumes merely tapering 
to a sharp point ; and the rare P. alpinum, L. has a much shorter 
spike and glumes ciliate on the keels. 
The rare P. asperuwm, Jacq. has broad, shortly mucronate glumes 
and a longer and more slender spike. 
(2) Inflorescence a panicle—i.e. tufts or spreading 
stalked groups of spikelets are arranged on 
the main axis. 
A. Inflorescence compact and irregular; a spike of 
tufts (spike-like panicle). Glumes four, the inner 
pair awned: palee minute. Stamens two only. 
Anthoxanthum odoratum, L. 
