intercross

Pisum sativum, varieties of, rarely intercross, but a cross between them highly beneficial.

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

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

If two distinct breeds were mingled together in equal numbers, there is reason to suspect that they would to a certain extent prefer pairing with their own kind; but they would often intercross.

From The Variation of Animals and Plants under Domestication — Volume 2 by Charles Darwin

We have also seen that as plants became more highly developed and affixed to the ground, they would be compelled to be anemophilous in order to intercross.

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

Both species are grown in pure form in Korea, and they intercross readily, and we do not regard it as a new species.

From Northern Nut Growers Association Report of the Proceedings at the 44th Annual Meeting Rochester, N.Y. August 31 and September 1, 1953 by Northern Nut Growers Association