CHAPTER XV 
THE ANGIOSPERMS 
Tus is the group of plants which formerly occupied 
almost all the attention of students of botany. It is prob- 
ably the youngest of all the groups, is certainly the most 
numerous and most conspicuous, and from some points of 
view it is the most interesting of all. The name of the 
group indicates the fact that the seeds are enclosed within 
the structure that bears them, and not exposed, as in Gym- 
nosperms. Nearly all the members of the group have 
true floral leaves, though this is not a constant character 
throughout the group. These structures, together with the 
sporophylls, constitute the flower. 
LESSONS LVIII, LIX, AND LX 
The wild lily, the buttercup, the tulip, or the primrose 
will serve well as a type of the entire group. Any simple 
flower showing all the parts will serve for this lesson. 
General study.— Note the general plan of the plant body. 
Is it essentially similar to that seen in the pine? Make a 
general sketch showing roots, stem, and leaves. 
The vegetative structures—1. The roots—Make a de- 
tailed sketch of a part of the root system, showing the organ- 
ization into large roots, then somewhat smaller branches, 
and so on until the smallest divisions are reached. Do 
these roots have more wood-fiber as they approach the stem? 
The wood-fiber is made up of bundles of tissue composed of 
elongated or tubular cells, which serve to carry water, and 
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