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Annual or perennial herbs or shrubs. Leaves simple, opposite (ternate in some Peruvian species), petiolate or sessile. Inflorescence terminal or axillary, usually consisting of pairs of cymes, sometimes reduced to axillary pairs of pedicels. Flowers with the calyx 4-parted, the sepals valvate, the corolla bilabiate, yellow or reddish (Peru and Chile); upper lip usually smaller than the lower lip, hooded; lower lip saccate, inflated, globose; stamens 2, the filaments short, the anther cells deflexed or divaricate; ovary 2-loculed; the style short, often recurved, the stigma simple. Capsule dry; seeds minute, numerous.
