Polygala japonica is a species of flowering plant in the milkwort family (Polygalaceae).

It is native to Northeast, East and Southeastern Asia, as well as eastern Australia.

[1][2][3] It is a wiry and decumbent dwarf shrub with a height between 10 and 25 centimetres (3.9 and 9.8 in).

Its stems have tiny curled hairs.

Its flowers are purple to mauve and 5 to 6 millimetres (0.20 to 0.24 in) long.