Herbs annual. Roots fibrous. Stems prostrate, ascending to erect, terete, striate or angled, branched or simple. Inflorescences racemelike or with a solitary terminal flower. Flower 5merous. Calyx and corolla rotate, lobed nearly to base, tube indistinct or distinct. Corolla lobes dextrorse in flower bud, distinctly 2colored when corolla opens. Nectaries 1 at base of each corolla lobe, appendaged. Stamens inserted at base of corolla tube; filaments somewhat flattened; anthers blue, rarely yellow. Ovary 1celled. Style absent; stigma lobes ± decurrent along apical part of ovary. Capsules 2valved, many seeded. Seed coat almost smooth.
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