16 



SHOOT-SECTIONS 



[CH. 1 



In these latter cases the transverse section may be 

 elliptical— e.g. Poa pratensis and P. alpina, Bnza, &c., 



^D 



Fig. 6. Daciijlis plomerafn. 

 Transverse section of a 

 leaf-shoot ( x 5). A, con- 

 duplicate leaf-blade. B, 

 sheath. Stebler. 



Fig. 7. Digraphis arundiiuicea. Trans- 

 verse section of a leaf-shoot ( x 5). 

 A, sheath. B, convolute leaves. 

 Compare Fig. 14. 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 navicidate — 

 e.g. Glyceria aquatica, Dactylis (Fig. 6) — or, the sides being 

 less flattened, more or less rkomboidal as in Poa trivialis. 

 In Melica the leaves are convolute and the shoot-section 

 quadrangular. 



Flat, and usnall}' sharp-edged shoots. 



Dactylis glomerata (Fig. 6). 



Poa tnvialis, P. annua, P. pratensis, P. compressa, P. maritima^ 



and P. alpina. 

 Glyceria aquatica and G. Jluitans. 

 Avena pubescens. 

 LoUum perenne. 



