Zomlefer, Wendy B.; Whitten, W. Mark; Williams, Norris H. & Judd, Walter S. (2006), "Infrageneric Phylogeny of Schoenocaulon (Liliales: Melanthiaceae) with Clarification of Cryptic Species Based on ITS Sequence Data and Geographical Distribution", American Journal of Botany, 93 (8): 1178–1192, doi:10.3732/ajb.93.8.1178, PMID21642183
Zomlefer, Wendy B.; Whitten, W. Mark; Williams, Norris H. & Judd, Walter S. (2006), "Infrageneric Phylogeny of Schoenocaulon (Liliales: Melanthiaceae) with Clarification of Cryptic Species Based on ITS Sequence Data and Geographical Distribution", American Journal of Botany, 93 (8): 1178–1192, doi:10.3732/ajb.93.8.1178, PMID21642183