374 THE VEGETABLE WORLD. 
known species belonging to the order, which contain 173 genera 
and 1,600 species. 
The Cructrer is one of the most natural groups of the whole 
<8 vegetable world, and in 
studying one of the spe- 
cies which compose it we 
may study all. Let us 
take as a type one flower, 
the Wallflower (Fig. 
391). This flower is 
regular. The calyx is 
composed of four sepals, 
free and straight, the 
two lateral bulging out 
at the base. The corolla 
has four unguiculate 
petals alternating with 
the sepals, and hi bs 
which are  patulous 
throughout. The sta- 
mens are tetradynamous, 
SN Sa 
= 
ag 
3 
co) 
=] 
mn 
Fig. 391.—The Wallflower, mens, wh 
four are smaller, and are placed on the outside of the long 
stamens. The pistil is composed of a very elongated ovary; co 3 
mounted by a rather short style, of which the stigmate 18°F" 
