408 NATURAL HISTORY OF PLANTS. 
consists of species of Feronia, with numerous polyadelphous stamens 
united round the hypogynous disk in very unequal bundles (of 
which some may even be reduced to one stamen), and with 
ovary cells multiovulate and indefinite in number; or we might 
describe it as consisting of a species of Æyle, whose stamens, inserted 
round a circular disk instead of being free, are united into a variable 
number of unequal bundles.! The cupuliform calyx has five teeth 
Citrus Auranlium. 

Fra. 465. 
Long. sect. of flower (à). 
Fre. 456. 
Transverse section of fruit. 
(or a variable number, from four to six), and generally five imbricated 
petals; but the number of the latter may also vary from four to 
eight, or more. The fruit is a berry, of which oranges and lemons 
furnish a familiar example, and easily show the organization. The 
wall is not thick, although composed of three different layers; but 
the numerous cells contain, besides a variable number of seeds, a 
soft pulp, more or less acid or sweet, formed by hairs and elongated 
cells, secreting a juice abounding in their cavity, and which, spring- 
ing from the surface of the endocarp, advance into the cells, which 
they obstruct, and whose seeds they definitely envelope.’ These 
1 In Papeda and Pseudægle the bundles of 
stamens are more or less indicated; but the 
filaments are free, or nearly so; they may be 
made sections of the genus Citrus, ‘The pollen 
of the Awrantiacea, studied by H. Mont (in 
Ann. Se. Nat., sér. 2, iii. 330) is “ovoid; three 
folds; in water spherical with three papillose 
bands.” 
2 These cells are formed by the hairs of the in- 
ternal surface of the pericarp. At the opening of 
the flower the interior epidermis of the ovary 
already presents small prominent teats ; these are 
accrescent cells enlarging towards the middle 
of the wall. Others increase in the same way 
to the right and left of the first as far as the 
partition, They do, not rise thus upon the 
entire partition as far as the placentas; the 
phenomenon usually stops very far from the 
internal angle. Later, these cells whose summit 
is advanced towards the placentary angle be- 
comes acute at che apex, large towards the 
middle of their length, and then more or less 
pediculate; after which they are compressed 
one by the other, and their surface then presents 
