Perennial, lacking nodular roots; stems to c. 80 cm high, narrowly winged just below infl. and above first few cymes. Petioles to 10 cm long on basal lvs, much less on stem lvs. Lamina 6-18 × 2-6 cm, smaller below infl., oblong, ovate-oblong or elliptic-oblong, hairy at first, becoming glabrous above and often glabrate below later, crenate or less commonly crenate-serrate; base subcordate to rounded, sometimes very oblique or with 1-2 small basal leaflets; apex obtuse or rounded. Cymes in panicles in the axils of mostly linear bracts, shortly glandular hairy; rachis angled. Pedicels usually several × > fls, but sometimes shorter. Calyx 2-3.5 mm long; lobes broad-ovate with scarious margin 0.5-1 mm wide and becoming lacerate. Corolla 7-10 mm long, greenish below, reddish brown or purplish brown above, especially the erect, rounded larger lobes of the upper lip. Staminode orbicular or suborbicular, entire. Capsule c. 5 mm long, ovoid or subglobose. Seed ribbed, ± truncate or obtuse.