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.

The plants are referred to as xiān cǎo (仙草), xiānrén cǎo (仙人草), xiān cǎo jiù (仙草舅) or liángfěn cǎo (涼粉草) in Mandarin Chinese, sian-chháu (仙草) in Taiwanese, lèuhng fán chou (涼粉草) in Cantonese, sương sáo in Vietnamese, and ya chaokuai (หญ้าเฉาก๊วย) in Thai.

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