FULL-GROWN PLANT AND ITS PARTS Al 
At the top of the stem the first and largest flower head 
is formed, and others come on later from short branches 
in the axils of the upper 
leaves. The full-grown 
plant has a golden crown 
of flower heads held up by 
the tall stem shaft. 
The mullein is also tall and 
slender, with rough, woolly 
leaves and a long spike of 
yellow flowers. The plants 
are tall and slender because 
the main stem is so proml- 
nent and branches not at 
all, or but little. In the 
sunflower and mullein the 
habit 1s cylindrical. 
Tall larches, spruces, and 
pines. ‘These trees branch 
very much. But observe how 
small the branches are com- 
pared with the main shaft, 
which extends straight 
through to the top. The 
habit is like that of a cone. 

Fic. 72. Cylindrical stem of mullein. 
The oaks and birches have a more or less oval habit. 
The elms have a spreading habit, and so on. Is a pine, 
