H.5.1. The appropriate rank of a nothotaxon is that of the postulated or known parent taxa.
H.5.2. If the postulated or known parent taxa are of unequal rank the appropriate rank of the nothotaxon is the lowest of these ranks.
Note 1. When a taxon is designated by a name in a rank inappropriate to its hybrid formula, the name is incorrect in relation to that hybrid formula but may nevertheless be correct, or may become correct later (see also
Art. 52 Note 3).
Ex. 1. The combination Elymus ×laxus (Fr.) Melderis & D. C. McClint. (1983), based on
Triticum laxum Fr. (1842), was published for hybrids with the formula
E. farctus subsp. boreoatlanticus (Simonet & Guin.) Melderis
× E. repens (L.) Gould, so that the combination is in a rank inappropriate to the hybrid formula. It is, however, the correct name applicable to all hybrids between
E. farctus (Viv.) Melderis and E. repens.
Ex. 2. Radcliffe-Smith incorrectly published the nothospecific name Euphorbia
×cornubiensis Radcl.-Sm. (1985) for E. amygdaloides L. × E. characias subsp.
wulfenii (W. D. J. Koch) Radcl.-Sm., although the correct designation for hybrids between
E. amygdaloides and E. characias L. is E. ×martini Rouy (1900); later, he remedied his mistake by publishing the combination
E. ×martini nothosubsp. cornubiensis (Radcl.-Sm.) Radcl.-Sm. (in Taxon 35: 349. 1986). However, the name
E. ×cornubiensis is potentially correct for hybrids with the formula
E. amygdaloides × E. wulfenii W. D. J. Koch.
H.5A.1. When publishing a name of a new nothotaxon at the rank of species or below, authors should provide any available information on the taxonomic identity, at lower ranks, of the known or postulated parent plants of the type of the name.
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(c) by International Association for Plant Taxonomy. This page last updated Feb. 12, 2001.