On the mature stigma of a flower of the same species it germinates and a pollen tube grows down through the style to unite with an ovule, or egg cell, which then develops into a seed.
(the same species; germinates; it) (a pollen tube; grows down; L:On the mature stigma of a flower of the same species)
the same species a pollen tube
germinates grows down
it
L:On the mature stigma of a flower of the same species