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DescriptionPerennial herb (ours). Stipules 0. Leaves opposite. Flowers showy, in compact, terminal corymbs. Sepals fused below into a tube, 5-toothed above. Petals 5, with a long claw and an entire or slightly emarginate, limb, with 2 small blunt scales present at base. Stamens 10. Styles 2. Capsule many-seeded, opening by 4(-5) ± unequal teeth.