Herb; stems to c. 75 cm tall, swollen at nodes, hispid on 2 opposite sides, otherwise with few or no hairs. Cauline lvs with petioles 1-2 cm long, with copious, patent, hispid hairs; lamina 2-10 × 1.5-5.5 cm, elliptic-lanceolate to ovate, with appressed hairs, sometimes almost glabrous below, with 8-14 crenate-serrate teeth on each side; base rounded to truncate, shortly decurrent; apex often short-acuminate. Bracteoles hairy, < calyx. Calyx 10-12 mm long, with hairs dense and hispid; teeth narrowly triangular and spine-tipped. Corolla c. 15 mm long, densely hairy outside, pink; tube exserted from calyx; middle lobe of lower lip broad, ± rounded. Nutlets 2.8-2.9 mm long, broad-obovoid.