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DescriptionShrubs or perennial herbs. Leaves opposite and decussate or in whorls of 3(-4), but often appearing to be more numerous because of leafy short shoots at the nodes. Stipules composed of sheaths bearing 1-many setae or fimbriae. Inflorescence usually leafy and inconspicuous, made up of subsessile cymes. Flowers unisexual or bisexual. Style 0. Stigmas very long-exserted. Fruit crowned by persistent calyx lobes and supported by a U-shaped carpophore, splitting into 2 mericarps.