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Calyx gamosepalous, campanulate, tubular, spathaceous or urceolate, apex spatulate, bilabiate, truncate or 2-5-lobed, aestivation imbricate, with or without patelliform nectaries.
The flowers are caulioflorous, nocturnal, white, slightly fragrant and spathaceous. The fruit and seeds of this tree are berry plate yellow, pendent, candel-like, smooth, edible and used as fodder source.
lutea) the calyx is basically polysymmetric but it splits on one side ("spathaceous" calyx) (Ho & Liu, 2001).