Its species name was published by Mitsutaro Shirai (1933), but most modern scientists, even while still using this nomenclature by habit or as legacy, do not consider it as a bona fide species, but regard it as a cultivar [REF] of unknown parentage, or a cultigen of the yuzu .
The sudachi is classed within the Papeda subgenus in the Swingle scheme, and in the more complicated Tanaka scheme within the Eusmocitrus or true yuzu subgenus, under the Osmocitrus or yuzu section [REF].