For Acmella
Cronquist, A. 1980. Asteraceae, Volume I, Vascular flora of the Southeastern United States. University of North Carolina Press, Chapel Hill, N.C.
Jansen, R.K. 1985. The systematics of Acmella (Asteraceae-Heliantheae). Systematic Bot. Monographs 8.
Strother, J.L. 2006uu. Acmella. In Flora of North America Editorial Committee. 2006c. Flora of North America north of Mexico. Volume 21, Magnoliophyta: Asteridae, part 6: Asteraceae, part 3. Oxford Univ. Press, New York, NY. 616 pp.
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