Heliopsis Pers.
Heliopsis is a New World genus of ca. 18 species. Most are native to Central and South America (a few in North America). One variable species, Heliopsis helianthoides, is regularly cultivated as an ornamental (probably formerly more so than at present).
References
Brown N. (2000) Heliopsis. In: Cullen J. & al. (eds.), The European Garden Flora, vol. 6. Cambridge University Press, Cambridge: 649.
Fischer T.R. (1957) Taxonomy of the genus Heliopsis (Compositae). Ohio J. Sc. 57: 171-191.
García-Chávez A. & Molina Torres J. (2004) El género Heliopsis (Heliantheae; Asteraceae) en México y las alcamidas presentes en sus raíces. Acta Bot. Mexicana 69: 115-131.
Smith A.R. (2006) Heliopsis. In: Flora of North America Editorial Committee (eds.), Flora of North America, vol. 21. Oxford University Press, New York-Oxford: 67-70.