88 



ELEMENTS OF STRUCTURAL BOTANY. 



of plants, intermediate in structure, as we shall see, 

 between the groups upon which we have so far been 



Fig. 115. 



Fig. 114. 



engaged and others to which we shall presently direct 

 attention. 



122. As perhaps the commonest Canadian type of the 

 Coniferous Group, the White Pine first demands our 

 attention. This noble tree, in its general aspect, is 

 familiar to every one. It produces a straight trunk, 

 which is continued upward year after year by the develop- 

 ment of a strong terminal bud, the new branches of each 

 year being developed from a circle of lateral buds formed 

 behind the apex of the stem or old branch. The general 

 aspect of the tree, therefore, unless it is a very old one, is 

 that of a broad-based cone or spire. The leaves are straight 



Fig. 114. Leaves and cluster of staminate catkins of White Pine. (Wood 

 and Steele.) 

 Fig. 115. Pollen-grain of Pine. (Wood and Steele.) 



