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Helicteres   binhthuanensis    V.S.Dang,  sp. nov.  from Ham Thuan Bac District, Binh Thuan Province, Vietnam is described and illustrated. It is morphologically similar to    H.   angustifolia   , which is a common species in mainland southeast Asia, and    H.   sphaerotheca   , which is endemic to the Northern Territory, Australia, but differs from both by several salient characters such as leaf and calyx size, androgynophore length, petal color, and fruit shape. Photographs, a vernacular name, a preliminary conservation assessment, and a table of morphological characters comparing this new species to two closely related species also are provided.

Helicteres binhthuanensis V.S.Dang ( Malvaceae , Helicteroideae ), a new species from southern Vietnam