CHAPTER III. 



GRASSES CLASSIFIED ACCORDING TO THEIR 

 VEGETATIVE CHARACTERS. 



I. Sheaths entire except where those of lower 



LEAVES ARE BURST BY BRANCHES, &C. 



A. Aquatics with tlie sheaths reticulated, owing to large 

 air-cavities. Leaves eciuitaut, linear acute, often 

 floating. 



Glyceria fluitans (Br.). Floating sweet grass. Some- 

 what coarse, but useful pasture in water-meadows and 

 fens. Sweet-tasting. 



Section of sheathed leaves linear oblong; sheath 

 striate or furrowed, keeled; leaf ribbed; ligule broad 

 acute. Leaf-base with a yellow triangle. Smooth. 



Glyceria aquatica (Sm.). Reed sweet grass. Especially 

 given to growing in the water-courses and on banks 

 instead of spreading in the water-meadows, &c. Sweet- 

 tasting. 



Section of sheathed leaves broadly naviculate ; sheath 

 smooth, no keel ; leaf not ribbed, thick and inflated with 



