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DescriptionShrubs or annual or perennial herbs. Leaves simple, opposite, entire. Inflorescences cymose. Bract (0-)1. Bracteoles 2. Calyx 4-5-lobed, to near the base. Corolla 2-lipped; upper lip very shortly 2-lobed; lower deeply 3-lobed with raised palate. Stamens 2; thecae 2, lower with a well-defined whitish tail. Ovary 2-locular with 2 ovules per loculus. Capsule cylindric or clavate, (1-)4-seeded. Seeds usually rough.