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Annual or perennial, terrestrial, aquatic or epiphytic herbs, without true roots, bearing small complex bladder-like traps for capture and digestion of planktons. Inflorescence racemose. Bracts varied, basifixed, medifixed or variously produced below the point of attachment. Calyx 2-lobed. Corolla bilabiate, yellow, various shades of violet or purple, white or rarely blue or red. Stamens 2, inserted at base. Ovary globose or ovoid, stigmas 2-lipped. Capsules globose or ovoid. Seeds 1 to many, variously shaped and sculptured.