For Heloniadaceae
Dahlgren, R.M.T., H.T. Clifford, and P.F. Yeo. 1985. The families of the monocotyledons: structure, evolution, and taxonomy. Springer-Verlag, Berlin. 520 pp.
Kim, C., S.C. Kim, and J.-H. Kim. 2019. Historical biogeography of Melanthiaceae: a case of out-of-North America through the Bering Land Bridge. Frontiers Plant Sci. 10: 396.
Tamura. 1998. In Kubitzki, K., ed. 1998a. The families and genera of vascular plants. III. Flowering plants – Monocotyledons – Lilianae (except Orchidaceae). Springer, Berlin. 478 pp.
Zomlefer, W.B. 1996. The Trilliaceae in the southeastern United States. Harvard Papers in Botany 1: 91-120.
Zomlefer, W.B. 1997a. The genera of Melanthiaceae in the southeastern United States. Harvard Papers in Botany 2: 133-177.
Zomlefer, W.B., N.H. Williams, W.M. Whitten, and W.S. Judd. 2001. Generic circumscription and relationships in the tribe Melanthieae (Liliales, Melanthiaceae), with emphasis on Zigadenus: evidence from ITS and trnL-F sequence data. Amer. J. Bot. 88: 1657-1669.
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