In between Azolla and Platycarya which one is native to eastern Asia in China, Korea, and Japan?
Platycarya: Platycarya is a genus of flowering plants in the family Juglandaceae, usually treated as comprising a single species Platycarya strobilacea, though one to two additional species are accepted by some authors. Platycarya:  It is native to eastern Asia in China, Korea, and Japan.
i don't know