Shrubs. Stems obtusely 4-sided, scabrous; branchlets 4-sided. Leaves petiolate; leaf blade papery, secondary veins 2 on each side of midvein, margin remotely serrulate. Inflorescences terminal, cymose or corymbose; bracts small, with dense stellate trichomes. Pedicel with dense stellate trichomes. Hypanthium funnelform-campanulate, obtusely 4-sided, 8-ribbed. Calyx lobes orbicular, winged on ridges. Petals white to pink, broadly obovate, oblique. Stamens 8, curved, shortly beaked, whorls unequal in length; connective inflated at middle. Ovary half inferior, urceolate, 4-celled. Style exserted from corolla. Capsule urceolate, longitudinally dehiscent.
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