DIVISION II. RULES AND RECOMMENDATIONS
CHAPTER IV. EFFECTIVE AND VALID PUBLICATION
SECTION 2. CONDITIONS AND DATES OF VALID
PUBLICATION OF NAMES
Article 42
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.
Ex. 1. Nylander (1879) described the new species
"Anema nummulariellum" in a new genus
"Anema" without providing a generic description or diagnosis. Since at the same time he also transferred
Omphalaria nummularia Durieu & Mont. to
"Anema", none of his names was validly published. They were later validated by Forsell (1885).
Ex. 2. The names
Kedarnatha P. K. Mukh. & Constance (1986) and
K. sanctuarii P. K. Mukh. & Constance, the latter
designating the single, new species of the new genus, are both validly
published although a Latin description was provided only under the
generic name.
Ex. 3. Piptolepis phillyreoides Benth. (1840) was a new species assigned to the monotypic new genus
Piptolepis published with a combined generic and specific description, and both names are validly published.
Ex. 4. In publishing
"Phaelypea"
without a generic description or diagnosis, P. Browne (Civ. Nat. Hist.
Jamaica: 269. 1756) included and described a single species, but he
gave the species a phrase-name not a validly published binomial. Art.
42 does not therefore apply and
"Phaelypea" is not a validly published name.
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.
Ex. 5. The generic name
Philgamia Baill. (1894) was validly published, as it appeared on a plate with analysis of the only included species,
P. hibbertioides Baill., and was published before 1 January 1908.
(c)
2006, by International Association for Plant Taxonomy. This page last updated
14.03.2007
.
