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POWO follows these authorities in synonymising this name:
Flora of North America Editorial Committee (2006). Asteraceae. Flora of North America North of Mexico 21: 1-616. Oxford University Press, New York, Oxford. [Cited as Helianthus annuus.]
GCC (2011). Global Compositae Checklist http://compositae.landcareresearch.co.nz/. [Cited as Helianthus annuus.]
Wu, Z. & Raven, P.H. (eds.) (2011). Asteraceae. Flora of China 20-21: 1-992. Science Press (Beijing) & Missouri Botanical Garden Press (St. Louis). [Cited as Helianthus annuus.]
Zuloaga, F.O., Morrone, O. , Belgrano, M.J., Marticorena, C. & Marchesi, E. (eds.) (2008). Catálogo de las Plantas Vasculares del Cono Sur. Monographs in Systematic Botany from the Missouri Botanical Garden 107: 1-3348. Missouri Botanical Garden. [Cited as Helianthus annuus.]
Other Kew resources that provide information on this taxon: