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It is a stout succulent, glabrous or pubescent perennial herb or shrub. The stems are long much-branched in the upper part. Lower leaves are ovate to rectangular, cuneate or truncate, usually with several coarse teeth, while the upper leaves are narrower, lanceolate, and often entire. Flowers are with white or green corolla with heavily purple-violet upper lip and arranged in dense inflorescences elongating to 30 cm. The fruit is a capsule.