Phryma nana is a species of flowering plant in the family Phrymaceae, native to Japan. It was first described by the Japanese botanist Gen-ichi Koidzumi in 1939. Its status as a separate species was not usually accepted, and it was treated as a subspecies or variety of Phryma leptostachya. In 2016, the distinctiveness of the Japanese P. nana was again supported, based on both earlier molecular phylogenetic analysis and morphological analysis., the species is recognized by Plants of the World Online.