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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 Porophyllum ruderale.]
Funk, V.A., P.E.Berry, S.Alexander, T.H.Hollowell & C.L.Kelloff (2007). Checklist of the Plants of the Guiana Shield (Venezuela: Amazonas, Bolivar, Delta Amacuro; Guyana, Surinam, French Guiana). Contributions from the United States National Herbarium 55: 1-584. [Cited as Porophyllum ruderale.]
GCC (2011). Global Compositae Checklist http://compositae.landcareresearch.co.nz/. [Cited as Porophyllum ruderale.]
Other Kew resources that provide information on this taxon: