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DescriptionAnnuals. Flowers solitary or in 1-sided racemes, blue or violet, rarely white. Calyx 5-toothed. Corolla with long straight slender tube and 5-lobed ± zygomorphic limb. Stamens 4, didynamous; anthers of shorter pair with 1 cell undeveloped; fifth rudimentary stamen sometimes present. Capsule with 2-lobed valves.