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 the sheaths reticulated, owing to large 
air-cavities. Leaves equitant, 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 
