19.1. The name of a subfamily is a plural adjective used as a noun; it is formed in the same manner as the name of a family
(Art. 18.1) but by using the termination
-oideae instead of -aceae.
19.2. Names intended as names of subfamilies, but published with their rank denoted by the term "suborder" (subordo) instead of subfamily, are treated as having been published as names of subfamilies (see also
19.3. A tribe is designated in a similar manner, with the termination
-eae, and a subtribe similarly with the termination -inae (but not
19.4. The name of any subdivision of a family that includes the type of the adopted, legitimate name of the family to which it is assigned is to be based on the generic name equivalent to that type (but see Art. 19.7).
Ex. 1. The type of the family name Rosaceae Adans. is Rosa L. and hence the subfamily and tribe which include
Rosa are to be called Rosoideae Endl. and Roseae DC.
Ex. 2. The type of the family name Poaceae Barnhart (nom. alt.,
Gramineae Adans. - see Art. 18.5) is Poa L. and hence the subfamily and tribe which include
Poa are to be called Pooideae Asch. and Poëae R. Br.
Note 1. This provision applies only to the names of those subordinate taxa that include the type of the adopted name of the family (but see
Ex. 3. The subfamily including the type of the family name Ericaceae Juss. (Erica L.), irrespective of priority, is to be called
Ericoideae Endl., and the tribe including this type is called Ericeae D. Don. However, the correct name of the tribe including both
Rhododendron L., the type of the subfamily name Rhododendroideae Endl., and
Rhodora L. is Rhodoreae D. Don (1834) not Rhododendreae Brongn. (1843).
Ex. 4. The subfamily of the family Asteraceae Martinov (nom. alt.,
Compositae Adans.) including Aster L., the type of the family name, is irrespective of priority to be called
Asteroideae Asch., and the tribe and subtribe including Aster are to be called
Astereae Cass. and Asterinae Less., respectively. However, the correct name of the tribe including both
Cichorium L., the type of the subfamily name Cichorioideae W. D. J. Koch (1837), and
Lactuca L. is Lactuceae Cass. (1815), not Cichorieae D. Don (1829), while that of the subtribe including both
Cichorium and Hyoseris L. is Hyoseridinae Less. (1832), not
Cichoriinae Sch. Bip. (1841) (unless the Cichoriaceae Juss. are accepted as a family distinct from
19.5. A name of a subdivision of a family based on an illegitimate generic name that is not the base of a conserved family name is illegitimate. Contrary to
Art. 32.1(b) such a name is validly published if it complies with the other requirements for valid publication.
Ex. 5. The name Caryophylloideae Arn. (1832), based on Caryophyllaceae Juss., nom. cons., is legitimate although it is ultimately based on the illegitimate
Caryophyllus Mill. non L.
19.6. When a name of a taxon assigned to one of the above categories has been published with an improper Latin termination, such as
-eae for a subfamily or -oideae for a tribe, the termination must be changed to accord with the rule, without change of the author citation or date of publication (see
Art. 32.5). However, if such names are published with a non-Latin termination they are not validly published.
Ex. 6. "Climacieae" (Grout, Moss Fl. N. Amer. 3: 4. 1928), published to designate a subfamily, is to be changed to
Climacioideae Grout (1928).
Ex. 7. However, Melantheen (Kittel in Richard, Nouv. Elém. Bot., ed. 3, Germ. Transl.: 727. 1840), published to designate a tribe, is not to be accepted as "Melanthieae Kitt.", as it has a German rather than a Latin termination. The name
Melanthieae was validated later by Grisebach (Spic. Fl. Rumel. 2: 377. 1846).
19.7. When the Papilionaceae are included in the family Leguminosae (nom. alt.,
Fabaceae; see Art.18.5) as a subfamily, the name Papilionoideae may be used as an alternative to
19A.1. When a family is changed to the rank of a subdivision of a family, or the inverse change occurs, and no legitimate name is available in the new rank, the name should be retained, and only its termination
(-aceae, -oideae, -eae, -inae) altered.
Ex. 1. The subtribe Drypetinae Griseb. (1859) (Euphorbiaceae) when raised to the rank of tribe was named
Drypeteae Hurus. (1954); the subtribe Antidesmatinae Müll. Arg. (1865)
(Euphorbiaceae) when raised to the rank of subfamily was named Antidesmatoideae Hurus. (1954).
19A.2. When a subdivision of a family is changed to another such rank, and no legitimate name is available in the new rank, its name should be based on the same generic name as the name in the former rank.
Ex. 2. Three tribes of the family Ericaceae, none of which includes the type of that family name (Erica L.), are Pyroleae D. Don, Monotropeae D. Don, and Vaccinieae D. Don. The later names Pyroloideae A. Gray, Monotropoideae A. Gray, and Vaccinioideae Endl. are based on the same generic names.
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(c) by International Association for Plant Taxonomy. This page last updated Feb. 12, 2001.