98 Hill .— The Structure and Development of 
two lateral stamens arose first, but, judging from their size, 
it seems extremely probable that the one opposite the second 
sepal arises slightly before the other, which follows it very 
quickly. 
When the stamen has attained a certain size, increased 
lateral growth takes place, so that a two-lobed structure 
results, and in a short time the stamen becomes quite two- 
lobed, each lobe being slightly constricted, owing to the 
formation of the two loculi. 
The inner staminal whorl arises after the first has been 
developed, the stamen opposite the posterior petal being the 
first to arise. 
By the time the stamens are all developed, the sepals have 
increased very much in size, so that each one forms a hood, 
as it were, over the stamen opposite it (Figs. 21 and 22). 
Gynoecium. As in the case of the stamens, the carpels 
also are arranged, though not quite so obviously, in two 
whorls. A carpel first arises as a somewhat flattened pro¬ 
tuberance ; growth gradually extends up the dome-shaped 
receptacle, so that a young carpel has a shape somewhat like 
that of a horse-shoe. 
In the carpels the suture along which the coalescence 
of the two horns has taken place is indicated by a faint 
line (Fig. 25). 
The walls of the carpel grow upwards, so that a hollow 
vessel, somewhat of the shape of a pear, results. After 
a time, the outer part of the wall of the carpel grows more 
quickly than its inner region; hence the aperture at the top 
becomes placed somewhat nearer the centre of the flower. 
In this way a hood-shaped structure is produced (Figs. 25 
and 26). It is about this time that the hairy stigmatic 
surface arises. 
The ovule originates as a dome-shaped mass of tissue, while 
the carpellary walls are still in a primitive state. 
The ovule is basilar in origin, and anatropous in character. 
