Herbs, the stems somewhat angular, glabrous. Leaves lanceolate, the few lateral veins strongly ascending near the margin, glabrous; petioles obvious; stipules connate, the sheath with 3 setas. Inflorescences axillary, capitate; bracts suborbicular with numerous segments. Flowers with calycine teeth 4, subequal; corolla rotate infundibuliform, densely pubescent outside, the lobes 4, valvate; stamens 4, the anthers oval; ovary 2-celled, with a single ovule per cell, attached to the upper part of the septum. Fruits vaguely didymous, the calyx persistent; seeds obovate, concave ventrally, delicately reticulate.
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