170 



BUDS AND LEAVES 



Modifications. In asparagus the leaves are reduced to 

 minute scales without chlorophyll . In barberry the leaves are 

 modified to form spines. In sundew the leaves are covered 

 with stalked glandular hairs which assist in capturing and 

 digesting insects. In Venus' flytrap the leaves will mechani- 

 cally close upon an insect and remain closed until the insect 





r y?& Hi 



FIG. 105. Compound Leaves. Honey locust (Gleditsia triacanthos) . 

 Nine figures showing the compounding of leaflets. In the ninth figure the 

 leaf is twice compound or decompound. 



is digested. In pitcher plants the leaves are hollow and are 

 usually partly filled with water so that insects falling into 

 the water are drowned and finally utilized as food by the 

 plant. In water hyacinth, the petiole becomes greatly 

 enlarged and serves as a float to keep the plant on the surface 

 of the water. 



