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Herb or subshrub, 0.5–2.5 m high. Stem purplish blue, glabrescent to puberulous. Leaves petiolate; petiole 5–20 mm long; lamina ovate-elliptic or oblong-elliptic, 25–100 mm long, 20–50 mm wide, attenuate or decurrent into petiole, crenately serrate, membranous to chartaceous when dry; lower surface glabrous but sparsely strigose on veins. Spikes slender, flaccid, 150–450 mm long, 1–3 mm diam., subglabrous; rhachis furrows as wide as rhachis; bracts ovate, subulate at tip, 3–5 mm long, 1–2 mm wide. Calyx compressed, 4-costate, 4–6 mm long, puberulous to glabrescent. Corolla violet-blue, salver-shaped; tube cylindrical, 6–7 mm long, villous in throat; limb 5 mm diam. Stamens inserted in corolla throat. Ovary oblong, glabrous; style 4–7 mm long. Fruit oblong, somewhat compressed, 3–4 mm long, brown to blackish.
An erect woody herb or shrub. It keeps growing from year to year. It grows 1-2 m high. The leaves are opposite and have shallow teeth. They are 5-11 cm long by 3-5 cm wide. The flowers are in a group at the top of the plant. The flowers are blue. They are 2 mm across. The fruit are 3-4 mm long by 2 mm wide. They contain 2 nutlets.
