intercross

So it must be, owing merely to the prepotency of foreign pollen, with cabbages and various other plants, the varieties of which almost invariably intercross when grown together.

From Effects of Cross and Self Fertilisation in the Vegetable Kingdom by Charles Darwin

For the sides approach in an arching way, surrounding a considerable cavity, and the marginal spine-like bristles merely intercross their tips, leaving intervening spaces through which one may look into the cavity beneath.

From Darwiniana; Essays and Reviews Pertaining to Darwinism by Asa Gray

Their expeditions intercross each other; we find them everywhere at once; Franks are seen at London, and Saxons at Angers.

From A Literary History of the English People From the Origins to the Renaissance by Jean Jules Jusserand

Cultivated plants like those in a state of nature frequently intercross, and will thus mingle their constitutional peculiarities.

From Effects of Cross and Self Fertilisation in the Vegetable Kingdom by Charles Darwin

Lathyrus odoratus, varieties of, never naturally intercross in England.

From Effects of Cross and Self Fertilisation in the Vegetable Kingdom by Charles Darwin