When the name or the epithet in the name of a nothotaxon is a condensed formula (Art. H.6–7), the parental names used in its formation must be those that are correct for the particular circumscription, position, and rank accepted for the parental taxa.
If the genus Triticum L. is interpreted on taxonomic grounds as including Triticum (s. str.) and Agropyron Gaertn., and the genus Hordeum L. as including Hordeum (s. str.) and Elymus L., then hybrids between Agropyron and Elymus as well as between Triticum (s. str.) and Hordeum (s. str.) are placed in the same nothogenus, ×Tritordeum Asch. & Graebn. (1902). If, however, Agropyron is treated as a genus separate from Triticum, hybrids between Agropyron and Hordeum (s. str. or s. 1.) are placed in the nothogenus ×Agrohordeum E. G. Camus ex A. Camus (1927). Similarly, if Elymus is treated as a genus separate from Hordeum, hybrids between Elymus and Triticum (s. str. or s. 1.) are placed in the nothogenus ×Elymotriticum P. Fourn. (1935). If both Agropyron and Elymus are given generic rank, hybrids between them are placed in the nothogenus ×Agroelymus E. G. Camus ex A. Camus (1927); ×Tritordeum is then restricted to hybrids between Hordeum (s. str.) and Triticum (s. str.), and hybrids between Elymus and Hordeum are placed in ×Elyhordeum Mansf. ex Tsitsin & Petrova (1955), replacing ×Hordelymus Bachteev & Darevsk. (1950) non Hordelymus (Jess.) Harz (1885).
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), had to be changed to ×Dactyloglossum mixtum (Asch. & Graebn.) Rauschert (1969).
Names ending in -ara for nothogenera, which are equivalent to condensed formulae (Art. H.6.3–4 and H.6.4(b)), are applicable only to hybrids that are accepted taxonomically as derived from the parents named.
If Euanthe Schltr. is recognized as a distinct genus, hybrids simultaneously involving its only species, E. sanderiana (Rchb.) Schltr., and the three genera Arachnis Blume, Renanthera Lour., and Vanda W. Jones ex R. Br. must be placed in ×Cogniauxara Garay & H. R. Sweet (1966); if, on the other hand, E. sanderiana is included in Vanda, the same hybrids are placed in ×Holttumara Holttum (1958) (Arachnis × Renanthera × Vanda).
