Atención que en el nuevo Catálogo de Flora de Chile 2018, la nomenclatura se aclara a Lithrea caustica, árbol endémico de Chile Favor revisar en http://www.gayanabotanica.cl/pdfs/2018/1/01_Rodriguez_etal_2018.pdf

Note that iNaturalist follows POWO and that lists this as http://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:69838-1
So you must first motivate for a change in POWO before iNat will accept the change.
Note http://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:1838-1#synonyms that POWO regards Lithrea as a synonym for the current Lithraea. Unfortunately Rodriguez does not quote the source, so someone will have to find out what literature he is referring to in disagreeing with POWO.