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A genus of about twenty-five species in temperate and subtropical regions, allied to Andrachne. Flowers without petals, unisexual, axillary. Calyx with five sepals, persistent in fruit. Male flowers with five stamens which are longer than the sepals and inserted outside a lobed disk. Female flowers with an unlobed disk; styles three. Fruit a dehiscent capsule.
The generic name comes from the Latin securis, a hatchet, and negare, to refuse, in allusion to the hard wood of the type-species S. durissima, a native of the island of Réunion.