Calyx 5-partite nearly to the base; segments equal, narrowly lanceolate. Corolla with 2 large lips; posticous emarginate; anticous 3-lobed. Stamens 2 (with 2 rudiments); anthers 1-celled, mucronate at the base; pollen subglobose, nearly smooth, stopples 3 large. Ovary and style glabrous; branches of the style 2, very small, equal; ovules 2 in each cell. Capsule ellipsoid, 4-seeded, long-stalked; seeds without hairs, nearly smooth. —Leaves entire. Flowers purple, in short cymes; bracts and bracteoles scarcely 1/4 in. long, linear.