102 CLASSIFICATION ACCORDING TO [CH. 



* A glav/:ous shore plant with long creeping stolons 

 {sand-binder). Inflorescefnce 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). 



PMewm arenarium is much smaller (see below). 



** Erect. Inflorescence rarely longer than three 

 inches. Spikelets flat: glumes heeled, the keel 

 svddenly produced into a sharp stiff avm or 

 mucronate point. Palece two. 



Phleum. 



t Tall perennial meadow-grass. Avm 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. 



Infl/crrescence not more than 1 — \\ inch long. 



P. arenarium, L. 



The rare P. Boehmeri, 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. asperum, Jaoq. 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). Olumes four, the inner 



pair awned : paleae minute. Stamens two only. 



Anthoxantkum odoratum, L. 



