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Corolla tube equaling or shorter than the calyx, with 4 more or less semilunate, fimbriate-papillose scales, subtending the filaments; lobes 4, spreading, ovate-lanceolate, as long as or shorter than the tube.
Ovary more or less obovoid, unilocular; ovules numerous; style filiform; stigma simple, subcapitate, or bilobed, or obsolete, or divided in 2 filiform lobes.
Stems erect to prostrate, simple or more or less branched, terete to 4-angled, usually more or less narrowly winged.
Leaves linear to ovate, often connate, sometimes dilated and scarious at the base.
Flowers 4-merous, usually pedicellate, in axillary few to many-flowered fascicles.
Filaments inserted in the sinuses of the corolla lobes, filiform; anthers ovoid.
Annual or perennial herbs, sometimes somewhat succose.
Seeds numerous, subglobose, minutely scrobiculate.
Calyx a campanulate tube with 4 erect lobes.
Capsule obovoid, bivalved.