LOSS OF WATER 
2 9 
petiole may take on the character of the blade, and perform 
all its functions, as in the case of various acacias. In certain 
FIG. 20. Tulip bulb; longitudinal section. F, solid stem; B, flower 
bud; 5, leaf-bases serving as bud-scales, and also for the storage of plant 
food. 
leaves nothing remains but base, petiole, larger veins, and 
the lips of the blade, as in the New Zealand raspberry 
FIG. 21. Buds of the tulip-tree (Liriodendron tulipifera), showing stipules 
as bud-scales. 
(Fig. 1 8). In some plants, as for example, the grasses 
(Fig. 22), there is no distinction between petiole and blade. 
