Plants glabrous. Stems robust, grooved, slightly winged. Leaves 2-5 × 1-3 cm, adaxially dark green, abaxially pale, base long cuneate, decurrent, margin coarsely serrate except entire at base, apex acuminate. Bracts lanceolate, margin dentate. Flowers violet, in loose short racemes. Calyx conspicuously 8-veined, 2-lipped, upper lip more elongated, with 2 robust teeth, lower lip 3-toothed, with middle tooth larger than lateral teeth. Corolla exserted, ca. 10 × as long as calyx, tube erect or curved, lips circular, ± entire. Stamens and style nearly exserted. Nutlets conspicuously veined, ovoid, slightly scabrid. Fl. and fr. Sep (specimens not seen).
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