Sharp, W.M. 1935. A critical study of certain Epappose genera of the Heliantheae-Verbesininae of the natural family Compositae. Annals of the Missouri Botanical Garden. 22(1): 51-152.

Sharp, W.M. 1935. A critical study of certain Epappose genera of the Heliantheae-Verbesininae of the natural family Compositae. Annals of the Missouri Botanical Garden. 22(1): 51-152.

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