REF: Taxonomy: Grex


Greetings.

Speaking of nomenclature, binomials, specific epithets and such, does anyone 
here happen to know the current rules about grex marks? There was some change 
a few years ago about no grex preceding the name on some things like 
Heucherrella or whatever, but I have forgotten the particulars.  

Thank you.

Cordially,

Anner Whitehead
Richmond VA USA

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