Platostoma palustre

About

Platostoma palustre, commonly known as Chinese mesona, is a species of plant belonging to the genus Platostoma of the mint family. The species grows extensively in East Asia such as south east China, Japan and Taiwan preferring ravines, grassy, dry, and sandy areas. The plants are from 15 to 100 cm high with hairy stems and leaves. The leaves are tear-drop shaped and serrated.

Summary from Wikipedia