Flowers 5-merous or rarely 6-merous. Hypanthium campanulate to hemi-spheric, pubescent or glabrous. Calyx truncate to conspicuously lobed; exterior teeth often present and in some species exceeding the sepals. Petals large, purple to white. Stamens isomorphic or dimorphic; filaments elongate; anthers subulate to ovoid-lanceolate, declined in one direction transversely across the flower by the twisting of the filaments; connective sometimes prolonged at base and ending in a short, retrorse or divergent, basal spur, also in many species bearing a longer dorsal spur directed forward. Ovary superior, 3-to 5-celled; style elongate; stigma punctiform. Fruit a many-seeded capsule. Trees or shrubs, glabrous or variously pubescent, the flowers solitary in the axils or paniculate.
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