There was an interesting discussion on this very point at https://forum.inaturalist.org/t/create-a-id-category-called-mangroves-that-captures-the-different-families-that-make-up-mangrove-species/6927. Ultimately given most solutions would be to create a grossly polyphyletic ID option, there isn’t a straightforward answer.
Also see https://forum.inaturalist.org/t/create-taxon-field-functionality-analogous-to-observation-fields/7013 for a possible solution