Annual or perennial, decumbent or erect herbs. Leaves alternate,
toothed. Flowers zygomorphic, axillary, often resupinate on twisted pedicel,
peduncles axillary. Calyx 5-lobed. Corolla oblique, 2-lipped, upper lip
2-partite, lower 3-lobed, not divided to base. Stamens 5, free, anthers fused,
at least shorter anthers with bristles at apex. Ovary inferior, 2-locules,
placenta hemispheric, ovules numerous, stigma bifid. Fruit a capsule, dehiscing
by 2 valves at apex, or a berry crowned with calyx lobes. Seeds numerous,
minute, ellipsoid, compressed or trigonous.