|INTERNATIONAL CODE OF BOTANICAL NOMENCLATURE online|
42.1. The names of a genus and a species may be validly published simultaneously by provision of a single description (descriptio generico-specifica) or diagnosis, even though this may have been intended as only generic or specific, if all of the following conditions obtain: (a) the genus is at that time monotypic; (b) no other names (at any rank) have previously been validly published based on the same type; and (c) the names of the genus and species otherwise fulfil the requirements for valid publication. Reference to an earlier description or diagnosis is not acceptable in place of a descriptio generico-specifica.
42.2. For the purpose of Art. 42, a monotypic genus is one for which a single binomial is validly published, even though the author may indicate that other species are attributable to the genus.
42.3. Prior to 1 January 1908 an illustration with analysis, or for non-vascular plants a single figure showing details aiding identification, is acceptable, for the purpose of this Article, in place of a written description or diagnosis.
42.4. For the purpose of Art. 42, an analysis is a figure or group of figures, commonly separate from the main illustration of the plant (though usually on the same page or plate), showing details aiding identification, with or without a separate caption.
(c) 2006, by International Association for Plant Taxonomy. This page last updated 14.03.2007 .