Accepted By:
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Bailey, L.H. & E.Z. Bailey. 1976. Hortus Third i–xiv, 1–1290. MacMillan, New York.
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Huber-Morath, A. 1975. Achillea L. in Davis, P. 5: 224–252. In P. H. Davis Fl. Turkey & E. Aegean Isl.. Edinburgh University Press, Edinburgh.
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Nasir, E. & S. I. Ali (eds). 1980-2005. Fl. Pakistan Univ. of Karachi, Karachi.
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Voss, E. G. 1996. Michigan Flora, Part III: Dicots (Pyrolaceae-Compositae). Cranbrook Inst. of Science, Ann Arbor.
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