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Costus L.
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Specht, C. D. & D. W. Stevenson. 2006. A new phylogeny-based generic classification of Costaceae (Zingiberales). Taxon 55(1): 153–163.
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Hellenia Retz.
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Govaerts, R. H. A. 2013. Hellenia Retz., the correct name for Cheilocostus C.D. Specht (Costaceae). Phytotaxa 151(1): 63–64.
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Schatz, G. E., S. Andriambololonera, P. P. Lowry II, P. B. Phillipson, M. Rabarimanarivo, J. I. Raharilala, F. A. Rajaonary, N. Rakotonirina, R. H. Ramananjanahary, B. Ramandimbisoa, A. Randrianasolo, N. Ravololomanana, C. M. Taylor & J. C. Brinda. 2023. Catalogue of the Plants of Madagascar.
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