Annual, up to 70 cm tall, unbranched or with 2–4 branches below the middle, scabrous to hispid; stem square, furrowed. Leaves 15–40(–90) x 4–12 mm, opposite, lanceolate, coarsely toothed, 3–5-veined, usually shorter than internodes. Lower bracts 20–50(–90) x 3–12 mm, leaf-like, longer than calyx, upper bracts shorter than calyx. Flowers opposite in open racemes, raceme shorter than vegetative stem. Calyx 10–15-ribbed, 9–14(–20) mm long; tube 4–6 mm long; lobes 5, equal, broadly lanceolate, 5–9(–14) mm long, longer than tube. Corolla salmon-pink; tube 20–25 mm long, bent and expanded distally above calyx, densely glandular-pubescent; lobes of lower lip 6–9 x 3–6 mm, obovate, spreading; upper lip 3–6 x 6–9 mm, emarginate.