TOMATO OR BERRY TYPE 77 
Nature and Types of Fruits of Flowering Plants 
A fruit is difficult to define because not al] fruits involve the 
same structures in their formation. Some fruits are only much 
enlarged ovaries; but there are others which involve other struc- 
Fic. 75. — A, cross section of a Tomato. B, cross section of an Orange. 
w, ovary wall; p, placentas; s, seeds; a, partition walls; /, locules. 
tures closely related to the ovary. Since fruits involve a number 
of structures in their formation, it will be best to study some 
types and then formulate a definition. 
Tomato or Berry Type. — The fruit of 
the Tomato consists of the ovary which 
has enlarged and become fleshy and juicy. 
The most edible portion consists of the 
fleshy enlargements which develop from 
the inner angle of the locules and almost 
fill them. These enlargements bear the 
seeds and hence are the placentas much 
enlarged. Also the citrus fruits, such as 
Oranges, Lemons, etc., are of the berry 
type. However, they have no fleshy 
placentas. The seeds are attached to the 
small central core, and the juicy tissues Fic. 76. —Lengthwise 
developing from other parts of the ovary section through a Plum. 
and filling the locules constitute the flesh , seed; p, wall of pit; 
of these fruits. The fleshy and juicy * fleshy portion of ovary. 
features are characteristics of the berry; and a berry is often 
defined as a fleshened juicy ovary. (Fig. 75.) 
