THE TREE 15 



that grow from the stump arise from adventitious buds. They 

 also give rise to the branches that start on the trunk of a tree 

 when it has been opened up to the light by the removal of 

 other trees or by pruning. Dormant buds are buds that do 

 not develop immediately after being formed. They lie just 

 beneath the bark and may wait many years before starting to 

 grow. 



The Flowers of Trees. Trees have flowers the same as 

 other plants that produce seed. Usually they are small and 

 inconspicuous and so are rarely observed. Some forest trees 

 are grown as ornamental trees because of their beautiful blos- 

 soms as the locust, the catalpa, the tulip, the black cherry and 

 horse chestnut. Flowers on trees give rise to the fruit or seed 

 by the process of pollinization the same as with flowering 

 plants. In some trees as with the black cherry the flowers are 

 perfect, that is, both pistils and stamens occur in the same 

 flower. Some trees like the pines, chestnut, and oaks have 

 the pistillate and staminate portions in separate flowers but 

 both kinds of flowers on the same tree. Still others like 

 the cottonwood, tree of heaven, ashes and willows have these 

 flowers on different trees. 



Fruit and Seed. The fruit and seed are the result of the 

 fertilization and maturing of the pistillate flowers. Fruit and 

 seed vary greatly in form and size on different kinds of trees. 

 Some seed is very small and light and is easily blown about by 

 the wind such as poplar and willow seed, while other seeds 

 are large and heavy like the walnut and hickory. Some seed 

 has a fleshy covering like cherry, hackberry and cedar which 

 are eaten and scattered by birds. 



CLASSIFICATION OF TREES ACCORDING TO SIZE 



On a basis of size trees are often divided into : 



a. Seedlings young trees up to 4 feet in height. 



b. Small saplings trees from 4 feet to 10 feet in height. 



