Phyllostegia parviflora, a member of the Lamiaceae (mint) family, is a perennial herb. The egg-shaped to broadly egg-shaped, wrinkled leaves are usually 19 to 33 cm (7.5 to 13 in) long and 7.5 to 15.3 cm (3 to 6 in) wide. The leaf stalks are typically 6 to 13.5 cm (2.4 to 5.3 in) long. Six flowers are arranged along a flowering stalk. The corolla is white, sometimes tinged with purple, and about 9 to 13 mm (0.4 to 0.5 in) long. The upper corolla lip is about 3 mm (0.1 in) long while the lower lip is about 6 to 9 mm (0.2 to 0.4 in) long. The fruits are nutlets.