Symbol for a Hybrid Cross

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When a plant is a hybrid between two species within the same genus, the
botanical name gives the genus, one species, a cross, and the other
species.  The cross sign resembles the times sign, which has the
character reference ×.  For example,  'Goodwin Creek Grey'
lavender is Lavandula lanata × dentata.

Is there a more appropriate character reference than ×?  A simple
x is generally not used unless there is no other symbol available.

David E. Ross

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Re: Symbol for a Hybrid Cross

2013-08-02 7:54, David E. Ross wrote:

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Some books use a symbol larger than “×” in such notations, but there  
isn’t really any Unicode character that would constitute a suitable  
larger version of “x”. There’s the oddly named U+2715 MULTIPLICATION X  
“✕” (in the Dingbats block), but it’s too large. There’s U+2A2F VECTOR  
OR CROSS PRODUCT “⨯”, which might be more suitable in size, depending on  
font, but it is present in a few fonts only, and it is designated as a  
mathematical symbol (which does not prevent using it for other purposed  
as well, but does not make other use natural either).

But I think the issue can be regarded as authoritatively decided in the
International Code of Nomenclature for algae, fungi, and plants, which says:

“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.; Melampsora medusae Thüm. × M.  
occidentalis H. S. Jacks.; [...]”

The character used there is U+00D7 MULTIPLICATION SIGN “ד. It is not  
identified by its Unicode number, but the use of the name  
“multiplication sign” and the use of U+00D7 in the online HTML version  
seem to be sufficient evidence.

 From the example, it seems that the code recommends repeating the genus  
name as abbreviated, e.g. Lavandula lanata × L. dentata, which sounds  
logical, since the symbol denotes a hybrid of taxa (taxons), and the  
second part of a species name, such as “dentata”, is not a taxon name as  


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