482 NATURAL HISTORY OF PLANTS. 
equal number of stamens alternating with the perianth-leaves and in- 
serted a little below them ; each consists of a short filament and an 
introrse two-celled anther of longitudinal dehiscence.’ The gynzeceum 
is free, with a one-celled ovary which tapers into a slender style, passing 
through the narrow opening of the receptacular pouch, and traversed 
by a longitudinal groove down the placentary edge. Near the top of 
the style the edges of this groove are thickened, and turn outwards to 
form two thick elongated lips covered with stigmatic papille. In 
the bottom of the ovary-cell is a subcentral placenta, whereon is in- 
serted a nearly erect anatropous ovule, whose micropyle is turned 
down next the placenta,’ the thickened base of which often furnishes 
it with an obturator. 
Eleagnus angustifolia, 
Fie. 280. Fie. 281. Fie. 282. Fia. 283. Fie, 284, 
Longitudinal section Diagram. Fruit in its Longitudinal sec- Stone. 
of flower (2). indusium, tion of fruit (3). 
After flowering the receptacle grows and forms a complete 
indusium around the fruit, which is often long crowned by the 
remains of the perianth and androceum (figs. 282, 283). The walls 
of this indusium behave as in a true drupe. Its deep layers become 
hard and woody, forming a sort of stone (fig. 284°). Outside of this 
the tissues grow succulent as in a sarcocarp, and are covered exter- 
nally by the membranous epidermis cloaked in peltate hairs. The 
true fruit, lodged in this thick pouch, is an achene with a membra- 
Lin EZ. angustifolia the pollen-grains are tri- 
angular, much flattened, with little papille on 
the angles. (H. Mout, in Ann. Sc, Nat., sér. 2, 
iii, 314.) : 
2 The ovule has two coats. When adult its 
raphe is neither turned towards or away from the 
placenta, but is well on one side (fig. 281). 
3 It is formed of vertically elongated fibres 
incrusted with woody matter. The internal 
epidermis of the receptacle bears long cylindrical 
hairs, which persist even after the fruit is Tipe. 
The stone is traversed all the way down by 
more or less regular grooves, separated by 
rough projecting ribs, 
