H.11.1. The name of a nothospecies of which the postulated or known parent species belong to different genera is a combination of a nothospecific (collective) epithet with a nothogeneric name.
Ex. 1. Heucherella tiarelloides (Lemoine & E. Lemoine) H. R. Wehrh. is considered to have originated form the cross between a garden hybrid of Heuchera L. and Tiarella cordifolia L. (see Stearn in Bot. Mag. 165: ad t. 31. 1948). Its original name, Heuchera tiarelloides Lemoine & E. Lemoine (1912), is therefore incorrect.
Ex. 2. When Orchis fuchsii Druce was renamed Dactylorhiza fuchsii (Druce) Soó the name for its hybrid with Coeloglossum viride (L.) Hartm., Orchicoeloglossum mixtum Asch. & Graebn. (1907), became the basis of the necessary new combination Dactyloglossum mixtum (Asch. & Graebn.) Rauschert (1969).
H.11.2. The final epithet in the name of an infraspecific nothotaxon, of which the postulated or known parental taxa are assigned to different taxa at a higher rank, may be placed subordinate to the name of a nothotaxon at that higher rank (see Art. 24.1), e.g to a nothospecific name (but see Rec. H.10B).
Ex. 3. Mentha piperita L. nothosubsp. piperita (=
M. aquatica L. M. spicata L. subsp. spicata);
Mentha piperita nothosubsp. pyramidalis (Ten.) Harley
(in Kew Bull. 37: 604. 1983) (= M. aquatica L. M. spicata
subsp. tomentosa (Briq.) Harley).