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Turner, B. L.: The Comps of Mexico. A Systematic Account of the Family Asteraceae. Chapter 20a: Subtribes Montanoinae (Montanoa); Rojasian- thinae (Rojasianthus); Rudbeckiinae ( Ratibida, Rudbeckia); Spilanthinae (Acmella, Salmea, Spilanthus); Verbesininae (in part) ( Podachaenium, Squamopappus, Tetrachyron, Verbesina). 2016. (Phytologia, 24a). 109 p. Paper bd. (106221) 59.92
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