The Australian taxon commonly treated as Pluchea tetranthera is revised and shown to represent a complex of three closely related endemic species, i. e. Pluchea tetranthera, P. ferdinandi-muelleri and P. dunlopii. P. dunlopii is described as a species new to science. A key to the three species, illustrations, descriptions and a distribution map are given and their chromosome numbers (2n = 10) are presented for the first time.
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