226 BOTANY. 



which bear reproductive cells. The flower of the Angio- 

 eperms 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 



Fio. 127. — Diagrammatic section of a flower. Ke, calyx; K, corolla; /, the fUa- 

 ment, and a, tne 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, i, enclosing the ovule- 

 body, S)\ em, the embryo-sac; E^ germ-cell; j?s, a pollfu-tube penetrating the 

 style, and reaching the germ-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- 



