In order to be validly published, the name of a nothogenus or of a nothotaxon with the rank of subdivision of a genus (Art. H.6–7) must be effectively published (see Art. 29–31) with a statement of the names of the parent genera or subdivisions of genera, but no description or diagnosis is necessary, whether in Latin, English, or any other language.
Validly published names: ×Philageria Mast. (1872), published with a statement of parentage, Lapageria Ruiz & Pav. × Philesia Comm. ex Juss.; Eryngium nothosect. Alpestria Burdet & Miège (pro sect.) (in Candollea 23: 116. 1968), published with a statement of its parentage, E. sect. Alpina H. Wolff × E. sect. Campestria H. Wolff; ×Agrohordeum E. G. Camus ex A. Camus (1927), published with a statement of parentage, Agropyron Gaertn. × Hordeum L., and its later synonym ×Hordeopyron Simonet (1935, “Hordeopyrum”; see Art. 32.2), published with an identical statement of parentage.
Since the names of nothogenera and nothotaxa with the rank of a subdivision of a genus are condensed formulae or treated as such, they do not have types.
The name ×Ericalluna Krüssm. (1960) was published for plants that were thought to be the product of the cross Calluna vulgaris (L.) Hull × Erica cinerea L. If it is considered that these plants are not hybrids but variants of E. cinerea, the name ×Ericalluna Krüssm. remains available for use if and when known or postulated plants of Calluna Salisb. × Erica L. should appear.
×Arabidobrassica Gleba & Fr. Hoffm. (in Naturwissenschaften 66: 548. 1979), a nothogeneric name that was validly published with a statement of parentage for the result of somatic hybridization by protoplast fusion of Arabidopsis thaliana (L.) Heynh. with Brassica campestris L., is also available for intergeneric hybrids resulting from normal crosses between Arabidopsis Heynh. and Brassica L., should any be produced.
Names published merely in anticipation of the existence of a hybrid are not validly published under Art. 36.1(b).
