Herbs, annual or perennial, prostrate, unarmed. Raphides present. Leaves opposite, usually relatively small, without domatia; stipules persistent, interpetiolar and frequently fused to petioles, triangular, entire to erose, often scarious. Inflorescences terminal or displaced to pseudoaxillary, 1-flowered, ebracteate, subsessile or pedunculate. Flowers bisexual, remarkably reduced. Calyx with ovary portion sometimes papillose-villous with distinctive flattened trichomes; limb tubular, 5-lobed or-toothed. Corolla white to pink, funnelform, inside frequently pubescent in throat; lobes 5, valvate in bud. Stamens 5, inserted at middle or perhaps base of corolla tube, included; filaments short; anthers basifixed or perhaps dorsifixed, included. Ovary 2-celled, ovules numerous in each cell inserted on axile subglobose placentas; stigmas 2, filiform, included. Fruit indehiscent, subglobose to ellipsoid, dry, papery, sometimes papillose-villous with distinctive flattened trichomes, with calyx limb persistent; seeds numerous, small, angled; testa granulate; endosperm fleshy; embryo minute.
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