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H.3.1. Hybrids between representatives of two or more taxa may receive a name. For nomenclatural purposes, the hybrid nature of a taxon is indicated by placing the multiplication sign
× before the name of an intergeneric hybrid or before the epithet in the name of an interspecific hybrid, or by prefixing the term "notho-" (optionally abbreviated "n-") to the term denoting the rank of the taxon (see
Art. 3.2 and 4.4). All such taxa are designated nothotaxa.
H.3.2. A nothotaxon cannot be designated unless at least one parental taxon is known or can be postulated.
H.3.3. For purposes of homonymy and synonymy the multiplication sign and the prefix "notho-" are disregarded.
H.3A.1. The multiplication sign ×, indicating the hybrid nature of a taxon, should be placed so as to express that it belongs with the name or epithet but is not actually part of it. The exact amount of space, if any, between the multiplication sign and the initial letter of the name or epithet should depend on what best serves readability.
H.3A.2. If the multiplication sign is not available it should be approximated by a lower case letter “x” (not italicized).
(c) 2006, by International Association for Plant Taxonomy. This page last updated 19.03.2007 .