Binomial nomenclature

:For other topics using the name "binomial", see binomial (disambiguation).

Extensions on the binomial name

Trinomial nomenclature of animals

In zoology, an animal species may be further subdivided, using trinominal nomenclature to indicate a subspecies (sometimes called a race), e.g. the Great Cormorants (Phalacrocorax carbo) found in New Zealand differ slightly from those found elsewhere, and are classified as the subspecies Phalacrocorax carbo novaehollandiae. Only the single infraspecific rank is ever used in zoology, so no additional indication of rank is required, with the third place position sufficient to indicate it is a subspecies.

Related Topics:
Zoology - Trinominal nomenclature - Subspecies - Great Cormorant - New Zealand

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Botanical subdivision of species

In botany, there are several ranks below that of species, notably subspecies, variety, and form. This is unlike zoology, where only one rank (subspecies) exists below that of species. Thus infraspecific names of plants must be accompanied by a qualifier (such as "subsp.") to indicate the rank, whereas trinomial names of animals are not. For example:

Related Topics:
Botany - Subspecies - Variety - Form

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• Pinus nigra subsp. salzmannii
• Pinus nigra var. caramanica

An interspecific hybrid is designated with a multiplication sign before the epithet, e.g. Dianthus × allwoodii (Dianthus caryophyllus × Dianthus plumarius). An intergeneric cross is designated by a multiplication sign before the generic name, e.g. × Heucherella tirelloides (Heuchera sanguinea × Tiarella cordifolia) {{ref|botanical_nom}}. When a multiplication sign is not available (on a typewriter or in e-mail), a small letter "x" may be used instead.

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