When distinct SPECIES are crossed the case is reversed, for a plant's own pollen is always prepotent over foreign pollen; but to this subject we shall return in a future chapter.

当不同的物种杂交时， 情况就相反了， 因为植物自己的花粉总是比外来花粉更有优势； 但我们将在以后的章节中回到这个主题。