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Thanks, Kitty, yes i know about this draft, discussed this with @radekwalkowiak @choess and other iNat users. My personal view is, that differences are too weak for specific separation, populations of E. hyemale do differ a lot within Europe, Asia and North America, and i do suspect that intercontinental hybrids could be well fertile, as with crossings within species'.
Relatively minor genetic differences seem often to be over-valued, useful and diligent interpretation of gene sequences is at least the same important than to handle this tool.
@radekwalkowiak Once this swap is done, the synonymity will be built into the taxon description, so a search for or attempted use of Equisetum hymenale affine will result in the suggestion of the new taxon name. (I think it will also show up in brackets in searches, just not as the primary taxon name on the taxon's page.) The synonymy will also be noted on the Taxonomy tab for Equisetum praealtum once the swap is committed. I hope that addresses your concerns.
@radekwalkowiak Radek, i do suggest to remove this draft here, but to do it right the other way by swapping E. praealtum to E. hyemale ssp. affine.
Even in case there was a certain genetic gap between populations of E. hyemale in America and Eurasia, this was no forcing reason for splitting into distinct species'
However, as mentioned elsewhere by Christopher @choess E. hyemale ssp. affine rather proved to be nested within the species, but not to be separated from. This is in contradiction to splitting, which seems to be needless and useless by that. Since E. praealtum is still active, the number of IDs leading to ID as "Equisetum" is increasing, see https://www.inaturalist.org/observations?ident_taxon_id=964077&locale=en&subview=grid&verifiable=any
@erwin_pteridophilos Did you see this draft swap? (I don't think it had a flag.)