Phryma nana is a species of flowering plant in the family Phrymaceae, native to Japan.

[1] It was first described by the Japanese botanist Gen-ichi Koidzumi in 1939.

[3] 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.

[2][4] As of April 2022[update], the species is recognized by Plants of the World Online.