You mean the site iNaturalist does not align to any list (for common names) ? I am a bit surprised because now you are in a huge grey area and for common names i read that IOC has 20 languages…I would just stick to published lists(electronic or on paper).
Further i should choose a kind of synoniem for example for different ways of writing (SintJanskruid, Sint-Janskruid, Sint Janskruid) …you can search for a kind of name but it will convert rather quickly in the preferred name. But maybe i am thinking to easy about it…