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.