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Epiphytic or terrestrial herbs or subshrubs; stems erect, ascending, or scram-bling, often succulent, bearing adventitious roots. Leaves equal to strongly unequal in a pair, often appearing to be in a rosette, but usually large, elongated and surpassing the stem; usually lanceolate, membranous to fleshy, the apex acuminate, the base cuneate or long decurrent into the petiole. Inflorescences of many flowers, usually congested into axils of the leaves, but rarely exceeding
the length of the petiole. Flowers often hidden by the leaves; calyx lobes linear or lanceolate, free and usually long attenuate at the apex; corolla white or yellow with red or purple spots or lines, funnelform or trumpet shaped, spurred at the base; stamens included, the anthers oblong, coherent, bearded or not, dehiscing by a longitudinal slit; disc reduced to 1 or 2 glands; ovary superior. Fruit a bivalved capsule.
