Herbs annual. Stems ascending, trailing at base, 20-30 cm tall, branched, apex appressed strigose, basally subglabrous, reddish. Leaves in whorls of 4, linear, 1.2-3.5 × 1.8-3.8 cm, adaxially appressed ciliate, abaxially densely black glandular, densely ciliate on midrib and margin, margin remotely shallow serrate, flat or slightly revolute, apex acuminate. Spikes 1.2-6 cm × ca. 7 mm, continuous; bracts linear-lanceolate, almost as long as corolla, gray villous, grayish purple-red. Calyx ca. 1.2 × 1 mm, pilose outside. Corolla purplish, ca. 2 × as long as calyx. Nutlets unknown.

* Aquatic; ca. 1000 m. Yunnan.