- Strother, J.L., Taxonomy of Complaya, Elaphandra, Iogeton, Jefea, Wamalchitamia, Wedelia, Zexmenia, and Zyzyxia (Compositae-Heliantheae-Ecliptinae), Systematic Botany Monographs vol. 33: 1-111 (1991)
- Strother, J.L., Taxonomy of Complaya, Elaphandra, Iogeton, Jefea, Wamalchitamia, Wedelia, Zexmenia, and Zyzyxia (Compositae-Heliantheae-Ecliptinae), Systematic Botany Monographs vol. 33: 1-111 (1991)