DIVISION II. RULES AND RECOMMENDATIONS
CHAPTER III. NOMENCLATURE OF TAXA ACCORDING TO THEIR RANK
SECTION 2. NAMES OF FAMILIES AND SUBFAMILIES, TRIBES AND SUBTRIBES
Article 18
18.1. The name of a family is a plural adjective used as a
noun; it is formed from the genitive singular of a name of
an included genus by replacing the genitive singular inflection (Latin
-ae, -i, -us, -is; transliterated Greek -ou, -os, -es, -as, or -ous, and its equivalent
-eos) with the termination -aceae (but see Art.18.5).
For generic names of non-classical origin, when analogy with classical
names is insufficient to determine the genitive singular,
-aceae is added to the full word. Likewise, when formation from the genitive singular of a generic name
results in a homonym, -aceae may be added to the nominative singular. For generic names with
alternative genitives the one implicitly used by the original author
must be maintained, except that the genitive of names ending in -opsis is, in accordance with botanical tradition, always -opsidis.
Ex. 1. Family names based on a generic name of classical origin:
Rosaceae (from
Rosa, Rosae),
Salicaceae (from
Salix, Salicis),
Plumbaginaceae (from
Plumbago, Plumbaginis),
Rhodophyllaceae (from
Rhodophyllus, Rhodophylli),
Rhodophyllidaceae (from
Rhodophyllis, Rhodophyllidos),
Sclerodermataceae (from
Scleroderma, Sclerodermatos),
Aextoxicaceae (from
Aextoxicon, Aextoxicou),
Potamogetonaceae (from
Potamogeton, Potamogetonos).
Ex. 2. Family names based on a generic name of non-classical origin:
Nelumbonaceae (from
Nelumbo, Nelumbonis, declined by analogy with
umbo, umbonis),
Ginkgoaceae (from
Ginkgo, indeclinable).
18.2. Names intended as names of families, but published with
their rank denoted by one of the terms "order" (ordo) or "natural
order" (ordo naturalis) instead of "family", are treated as having been
published as names of families (see also Art. 19.2),
unless this treatment would result in a taxonomic sequence with a misplaced rank-denoting term.
Ex. 3. Cyperaceae Juss. (1789),
Lobeliaceae Juss. (1813), and
Xylomataceae Fr. (1820) were published as "ordo
Cyperoideae", "ordo naturalis
Lobeliaceae", and "ordo
Xylomaceae", respectively.
Note 1. If the term "family" is simultaneously used to denote a rank different from
"order" or "natural order", a name published for a taxon at the latter rank cannot be considered
to have been published as the name of a family.
*Ex. 4. Names published at the rank of order
("řad") by Berchtold & Presl (
O přirozenosti
rostlin .... 1820) are not to be treated as having been published at the rank of family, since the
term family ("čeleď") was sometimes used to denote a rank below the rank of order.
18.3. A name of a family based on an illegitimate generic name is illegitimate unless conserved.
Ex. 5. Caryophyllaceae Juss., nom. cons. (from
Caryophyllus Mill. non L.);
Winteraceae R. Br. ex Lindl., nom. cons. (from
Wintera Murray, an illegitimate synonym of
Drimys J. R. Forst. & G. Forst.).
18.4. When a name of a family has been published with an
improper Latin termination, the termination must be changed to conform
with the rule, without change of the author citation or date of
publication (see Art. 32.7). However, if such a name is published with a non-Latin termination, it is not validly published.
Ex. 6. "Coscinodisceae" (Kützing 1844), published to designate a family, is to be accepted as
Coscinodiscaceae Kütz. 1844 and not attributed to De Toni, who first used the correct spelling (in Notarisia 5: 915. 1890).
Ex. 7. "Atherospermeae" (Brown 1814), published to designate a family, is to be accepted as
Atherospermataceae R. Br. and not attributed to Airy Shaw (in
Willis, Dict. Fl. Pl., ed. 7: 104. 1966), who first used the correct
spelling, or to Lindley (Veg. Kingd.: 300. 1846), who used the spelling
"Atherospermaceae".
Ex. 8. However, Tricholomées (Roze in Bull. Soc. Bot. France
23: 49. 1876), published to designate a family, is not to be accepted
as "
Tricholomataceae Roze", as it has a French rather than a Latin termination. The name
Tricholomataceae was finally validly published by Pouzar (1983; see
App.
IIA).
18.5. The following names, of long usage, are treated as validly published:
Compositae (Asteraceae; type, Aster L.); Cruciferae (Brassicaceae; type, Brassica L.); Gramineae (Poaceae; type,
Poa L.); Guttiferae (Clusiaceae; type, Clusia L.); Labiatae (Lamiaceae; type, Lamium L.);
Leguminosae (Fabaceae; type, Faba Mill. [= Vicia L.]);
Palmae (Arecaceae; type, Areca L.); Papilionaceae (Fabaceae; type, Faba Mill.); Umbelliferae (Apiaceae; type,
Apium L.). When the Papilionaceae are regarded as a family distinct from the remainder of the Leguminosae, the name
Papilionaceae is conserved against Leguminosae.
18.6. The use, as alternatives, of the family names indicated in parentheses in Art. 18.5 is
authorized.
(c) 2006, by International Association for Plant Taxonomy. This page last updated
12.03.2007
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