International Code of Botanical Nomenclature

(Saint Louis Code), Electronic version



Article H.2

H.2.1. A hybrid between named taxa may be indicated by placing the multiplication sign between the names of the taxa; the whole expression is then called a hybrid formula.

Ex. 1. Agrostis L. . Polypogon Desf.; Agrostis stolonifera L. Polypogon monspeliensis (L.) Desf.; Salix aurita L. S. caprea L.; Mentha aquatica L. M. arvensis L. M. spicata L.; Polypodium vulgare subsp. prionodes (Asch.) Rothm. subsp. vulgare; Tilletia caries (Bjerk.) Tul. T. foetida (Wallr.) Liro.

Recommendation H.2A

H.2A.1. It is usually preferable to place the names or epithets in a formula in alphabetical order. The direction of a cross may be indicated by including the sexual symbols ({o+}: female;{o!}: male) in the formula, or by placing the female parent first. If a non-alphabetical sequence is used, its basis should be clearly indicated.

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