318 HESPERIDIUM——TRYMA—NUCULANIUM. 
The siliqua and silicula are only found in plants of the order 
Crucifere. Both fruits are occasionally one-seeded, and inde- 
hiscent. 
Cc. WITH A FLESHY INDEHISCENT PERICARP. 
1. The Hesperidium is a superior, many-celled, few-seeded, 
indehiscent fruit, consisting of a separable pericarp, formed of 
the epicarp and mesocarp combined together (fig. 715, p, e), and 
having an endocarp, d, projecting internally in the form of mem- 
branous partitions, which divide the pulp into a number of por- 
tions or cells, which are easily separated from each other. This 
pulp, as already noticed (page 300), is either a development of 
succulent parenchyma from the inner lining of the ovary gene- 
rally, or from the placentas only. The seeds, s, s, are imbedded 
Fre. 715. Fie. 716. 
Fig. 715. Transverse section of the fruit of the Orange (Citrus Aurantium). 
p. Hpicarp. e. Mesocarp. d. Endocarp. s,s. Seeds. Fig. 716. Abnormal 
development of the fruit of the Orange, in which the carpels, ce, and ¢i, 
are more or less distinct instead of being united. 
in the pulp, and attached to the inner angle of each of the por- 
tions into which the fruit is divided. The fruits of the Orange, 
Lemon, Lime, and Shaddock are examples of the hesperidium. 
It is by no means uncommon to find the carpels of this fruit in 
a more or less separated state (jig. 716), and we have then pro- 
duced what are called ‘horned oranges,’ ‘ fingered citrons,’ &c., 
and the fruit becomes somewhat apocarpous instead of entirely 
syncarpous. 
2. The Tryma is a superior, one-celled, one-seeded, indehis- 
cent fruit, having a separable fleshy or leathery rind, consisting 
of epicarp and mesocarp, and a hard two-valved endocarp, from 
the inner lining of which spurious dissepiments extend so as to 
divide the seed into deep lobes. It ditfers but little from the 
ordinary drupe, except in being formed from an originally com- 
pound ovary. Example, the Walnut. 
3. The Nuculanium.—This fruit, of which the Grape (jig. 
720) may be taken as an example, does not differ in any impor- 
tant characters from the berry, except in being superior. (See 
BERRY.) 
