926 BOTANY. 
which bear reproductive cells. The flower of the Angio- 
sperms is likewise a stem, bearing leaves which have to do 
with reproduction. In this class, however, there is, as a 
rule, a division of labor, as we may say: instead of all the 
leaves bearing reproductive cells, some of them are modi- 
fied in form, color, or structure, so as to make the flower 
Fig. 127,—Diagrammatic section of a flower. Ke, calyx; K, corolla; f, the fila- 
ment, and a, the anther, of the stamen; p, pollen-cells, some in the anther, 
others on the stigma; F, the ovary, surmounted by the style, g, and the stigma, 
n (this ovary contains one ovule, which has a single coat, 7, enclosing the ovule- 
body, S); em, the embryo-sac; H, germ-cell; ps, a pollen-tube penetrating the 
style, and reaching the gerin-cell through the micropyle of the ovule. 
more conspicuous, which is, as we shall see, to the advan- 
tage of the plant. 
480. There are so many particular forms of flowers that 
it would be impossible to notice or describe them all in this 
place. In some cases the flower is a little stem (axis) upon 
which are pollen-bearing or ovule-bearing leaves (stamens 
or ovaries); these clusters of reproductive organs may have 
a number of sterile leaves below them on the stem, the 
floral leaves, or perianth. In other cases both kinds of re- 
