References
Sherff, E.E., and E.J. Alexander. 1955. Compositae – Heliantheae – Coreopsidinae. North American Flora, series II, part 2. New York Botanical Garden. Google Scholar
Sherff, E.E., and E.J. Alexander. 1955. Compositae – Heliantheae – Coreopsidinae. North American Flora, series II, part 2. New York Botanical Garden. Google Scholar