Herbs, slender, erect, branching above, the branches dichotomous. Leaves 3 to numerous at a node, verticillate, the uppermost occasionally opposite; stip-ules obsolete, often reduced to a subulate projection. Inflorescences cymose with flowers solitary or in few-flowered terminal clusters in the angles or along the length of usually dichotomous branches. Flowers with the calycine lobes some-what foliaceous, persistent; corolla variously colored, hypocrateriform, the tube narrow, glabrous within, the mouth glabrous or variously pubescent, the lobes 5, oblong, contorted; stamens 5, inserted at the mouth, the anthers oblong, dor-sifixed, the filaments slender; ovary 2-celled, the ovules numerous, disposed on a median septum. Capsule ovoid, scarious, loculicidally dehiscent, the seeds numerous.
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