For Tragia
Cardinal-McTeague, W.M., and L.J. Gillespie. 2016. Molecular phylogeny and pollen evolution of Euphorbiaceae tribe Plukenetieae. Syst. Bot. 41: 329-347.
Govaerts, R., D.G. Frodin, and A. Radcliffe-Smith. 2000. World checklist and bibliography of Euphorbiaceae (with Pandaceae). Volumes 1-4. Royal Botanic Gardens, Kew, England.
Miller, K.I., and G.L. Webster. 1967. A preliminary revision of Tragia (Euphorbiaceae) in the United States. Rhodora 69: 241-305.
Urtecho, R.J. 2016. Tragia. In Flora of North America Editorial Committee. 2016. Flora of North America north of Mexico. Volume 12, Magnoliophyta: Vitaceae to Garryaceae. Oxford Univ. Press, New York, NY. 603 pp.
Webster, G.L. 2014. Euphorbiaceae. In Kubitzki, K., ed. 2014. The families and genera of vascular plants, XI. Flowering plants – Eudicots – Malpighiales. Springer, Berlin. 331 pp.