16 SHOOT-SECTIONS [CcHAt 
In these latter cases the transverse section may be 
elliptical—e.g. Poa pratensis and P. alpina, Briza, &c., 
| 
Fig. 6. Dactylis glomerata. Fig. 7. Digraphis arundinacea. Trans- 
Transverse section of a verse section of a leaf-shoot (x5). 
leaf-shoot ( x 5). A, con- A, sheath. 3B, convolute leaves. 
duplicate leaf-blade. B, Compare Fig. 14. Stebler. 
sheath. Stebler. 
or more flattened and linear-oblong—e.g. Glyceria flui- 
tans—with the flattened sides straight, or the section is 
oval but pointed more or less at each end owing to pro- 
jecting keels and leaf-edges, and the form is naviculate— 
e.g. Glyceria aquatica, Dactylis (Fig. 6)—or, the sides being 
less flattened, more or less rhomboidal as in Poa trivialis. 
In Melica the leaves are convolute and the shoot-section 
quadrangular. 
Flat, and usually sharp-edged shoots. 
Dactylis glomerata (Fig. 6). 
Poa trivialis, P. annua, P. pratensis, P. conypressa, P. maritima, 
and P. alpina. 
Glyceria aquatica and G. fluitans. 
Avena pubescens. 
Lolium perenne. 
