Intergeneric hybrid between a Ferocactus and Leuchtenbergia principis called Ferobergia (photo credit: kakteen-niess.at)

The sign used to denote a hybrid plant derived from the crossing of 2 or more botanically distinct plants.

An intergeneric hybrid is a cross between plants in two different genera in the same family.

An example is × Ferobergia, a hybrid between two cacti of the genus Ferocactus and of the genus Leuchtenbergia.

An intrageneric hybrid is a cross between two different speicies in the same genus.