*~ 



Group IV. Cord-rooted Grasses. 



Blade a hard bristle Nardusstricta^ L.(Moormatgrass). 

 Blade a very thin, dry, flat band Molinia cctrulea, 

 Moench. (Flying bent). 



Group V. Acute-sheathed Grasses. 



Sheath flat, with two acute edges (fig. i). 



Blade ribless, without median lines. 



Dactylis glomerata, L. (Cocksfoot). 



Fig. i. Section of shoot shewing the two-edged sheath 

 (magnified). After Stebler. 2. Base of blade and pro- 

 minent obtuse ligule. 3. Acute apex of blade. 4. 

 Transverse section of blade (magnified). Ribless 

 with a prominent keel. 

 Blade ribless, with median lines Poa, Glyceria, and 



Avena species. 



Poa trivialis, L. (Rough-stalked meadow grass). Shoot 

 flat, but much narrower than that of cocksfoot : the 

 blade tapered from the very base to the acute apex, 

 shining on the lower surface, and thin. 

 Fig. 5. Section of shoot shewing the two-edged sheath 

 (magnified). 6. Acute apex of blade. 7. Transverse 

 section of blade (magnified) shewing the median lines 

 and keel. 



Glyceria aquatica, Sm. (Reed sweet grass). An aqtiatic ; 

 blade rounded at apex and remarkably thick, con- 

 taining large air cavities: sheath netted (VI. n, 



12, 13, 14, 15). 



Avena pubescens, L. (Downy oat). See Group X. con- 

 tinued. Blade with median lines like Poa, and rib- 

 less. Hairy. 

 Sheath with four angles (fig. n). Thin bladed. 



Melica uniflora, L. (Wood melic). An awl-shaped process 



cf the ligule opposite the blade (figs. 9 and 10). 

 Fig. 8. Tapered base of blade. 9. Entire sheath and 

 awl-shaped process of the ligule. 10. The ligule spread 

 out ; the awl-shaped. process is split (magnified). After 

 Lund. II. Transverse section of the entire sheath : 

 two angles are acute, and two obtuse (magnified). 12. 

 Transverse section of the flatly rolled blade (magnified). 



13. Transverse section of mature blade (magnified). 

 Observe the fine ribs on lower surface. After Lund. 



Melica nutans, L. (Nodding melic). Rare. 



Fig. 14. Tapered base of blade and ligtde without the 



awl-shaped process. After Lund. 

 Fig. 15. The ligule spread out. After Lund. 



