Ewartiothamnus is a genus of flowering plants in the family Asteraceae endemic to New Zealand. It contains a single species, Ewartiothamnus sinclairii. This species was redescribed by A. A. Anderberg and placed in the genus Ewartiothamnus in 1991.Anderberg, A. A. 1991: Taxonomy and phylogeny of the tribe Gnaphalieae (Asteraceae). Opera Botanica 104: 1–195. It is found in Marlborough region. This species flowers in the months of October until December and fruits from November until February.
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