Dendrobium affine, commonly known as the white butterfly orchid, malakmalak or matngala in Australian Aboriginal languages, is an epiphytic orchid in the family Orchidaceae. It has cylindrical pseudobulbs, each with up to ten leaves and flowering stems with up to twenty white flowers with yellow or purple markings on the labellum. It occurs in northern Australia, New Guinea and Timor, where it grows on the bark of trees.

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