This is copied from the International Crassulaceae network.
Crassulaceae - General Information
International Code of Nomenclature for Cultivated Plants
General Information | Species | Hybrids | Cultivars
"XSEDORO" 'Blue Elf'
Published on a US website : http://www.sunsparklersedums.com/2014/1 ... -elf-ppaf/
The parentage is indicated as Sedum x Orostachys. Unfortunately the breeder has ignored that the "Sedum" he has used in fact is a species of genus Hylotelephium, so the correct parentage is Hylotelephium x Orostachys And unfortunately the "experts" he has contacted did not know either how the name of a nothogenus (hybrid genus) has to be formed to correspond to the rules of the Code (Art. H.6.2) : It has to be the first part or whole of one name & the second part of the other. He however has combined the first part of both ! ! ! Moreover he has published the name only on his website - to be valid such a name has to be published in a printed journal with an ISSN or an ISBN number.
That means the name "xSedoro 'Blue Elf' " is invalid in all respects.
As there exists no nothgenus name yet, the correct name of this hybrid is :
Hylotelephium x Orostachys 'Blue Elf'. (A possible correct nothogenus name could read xHylostachys.)
The fact that it has been possible to create a hybrid of these two genera is not a surprise, DNA data show that Hylotelephium and Orostachys are closely related.