Glabrous perennial herb; stems 30-80 cm tall, ascending, robust, usually glaucous, branching from base. Lvs opposite, cauline, variable on one plant; lower lvs of main stem lanceolate, 3-10-(17) × 1-3-(5) cm, entire, petiolate; upper lvs of main stem deltate-acuminate to ovate, smaller than lower lvs, often irregularly toothed, amplexicaul; lvs of side shoots smaller, ovate-lanceolate, usually amplexicaul. Cyme up to 25 × 10 cm, of many, pedicellate fls. Fls usually deep pink to magenta, sometimes white. Corolla tube 5-10 mm long, somewhat > spur. Fr. narrow-ovoid, flattened, 3-4 mm long.