R.R.Gates 1918 - Gates RR (1918) A Systematic Study of the North American Melanthaceae from the Genetic Standpoint. Journal of the Linnean Society of London, Botany 44(296): 131-172. doi: 10.1111/j.1095-8339.1918.tb00619.x.
There is no corrections for Toxicoscordion brevibracteatum yet.