36 



Elementary Work in Botany. 



branches. Take home the stem which you placed in red 

 ink, and find out what part absorbs the ink and how high 

 it has risen in the stem. 



EXERCISE 22. 



Flowering Branches of Poplar. Compare your 

 specimen with the figure. How is the terminal bud different 



from the others? 

 What do you 

 think is the use 

 of the balsam on 

 these buds? 

 Draw one of the 

 lateral buds. Re- 

 move the scales, 

 one at a time, 

 noting the posi- 

 tion of each. 

 Which is the 

 shortest? Which 

 one is narrow 

 and thin? The 

 white cottony 

 centerpiece is a 

 dense mass of 

 blossom buds which when in full bloom form a worm- 

 like hanging cluster of yellowish green flowers. Imagine 

 such clusters two inches in length hanging from each bud. 



Fig. 25. Winter buds of 

 I,ombardy Poplar (staminate 

 tree). A.'Fl ower-bearing 

 branch, a. Terminal bud. 

 b. Lateral flower bud. c. Scar 

 of leaf. d. Lateral bud which 

 will produce a branch like the 

 one shown on the right side 

 of the stem below, e. A re- 

 serve bud. /. Ring of scars 

 left by the scales of the ter- 

 minal bud of 1895. g. Scar 

 left by catkin of flowers which 

 fell in March ,1896. B. A leaf- 

 bearing branch five years old. 

 C. Base and top of a wood- 

 making branch, /. Section of 

 a terminal bud. k. Section of 

 a blossom bud showing the 

 catkin. 



