Graft-chimaera

In horticulture, a graft-chimaera may emerge in grafting at contact of rootstocks and scion, and will have properties the same as their "parents". A graft-chimaera is not a true hybrid, but is a mixture of cells, each with genotypes of their "parents", which are chimeras.

Propagation is only made through cloning.

Nomenclature
Article 21 of the International Code of Nomenclature for Cultivated Plants stipulates that a graft-chimaera can be indicated by:


 * a formula with the names of both parents in alphabetical order, which are joined by a plus sign (+).
 * Crataegus + Mespilus


 * a name:
 * if the "parents" belong to different genera, a name may be formed by joining both together. This name will not be identical to a generic name published under the International Code of Botanical Nomenclature. An example is +Crataegomespilus, which is a graft chimera which may also be indicated by its formula, Crataegus + Mespilus. This name is different from ×Crataemespilus, which is a true hybrid between the same species, Crataegus and Mespilus''.
 * if both the "parents" belong to the same genus, the graft-chimera might be given a cultivar name. An example is Syringa 'Correlata', which is a graft-chimaera between Syringa vulgaris (the common lilac), and Syringa × chinensis (the rouen lilac). No plus sign is used because both of the species belong to the same genus.

Graft-chimaeras cannot have species names, because it is simultaneously two species. Although +Laburnocytisus 'Adamii' is sometimes seen written as a species (+Laburnocytisus adamii), this is incorrect.