70 



AGRONOMY 



buds may also grow into twigs or flowers, but many of them 

 usually fail to develop. They may remain alive, however, but 

 continue in a resting condition, length- 

 ening just enough each year to avoid 

 being covered by the new wood and 

 bark. Such buds are called dormant 

 buds and are able to grow out to form 

 twigs if the other twigs are injured. 



The horticulturist often classes buds as 

 leaf buds when they contain only leaves, 

 flower buds when they produce flowers 

 only, and mixed buds when they contain 

 both leaves and flowers. Flower buds 

 that are formed in autumn are usually larger and different 

 in shape from leaf buds, and by these characteristics they 

 may be distinguished even in winter and the crop anticipated. 



-lam 



FIG. 52. Flower bud of 

 the buckeye 



FIG. 53. A leaf of geranium 



lam, lamina, or blade ; pet, petiole ; 

 slip, stipules 



FIG. 54. Morning-glory leaf show- 

 ing arrangement of the veins 



Leaves. The leaf is essentially an expanded part of the 

 stem, whose chief function is to make food for the plant from 

 the gases in the air and the water and minerals brought up 



