Zomlefer, WB; NH Williams; WM Whitten; WS Judd (2001). "Generic circumscriptions and relationships in the tribe Melanthieae (Liliales, Melanthiaceae), with emphasis on Zigadenus: Evidence from ITS and TRNL-F sequence date". American Journal of Botany. 88 (9). Botanical Society of America: 1657–1669. doi:10.2307/3558411. JSTOR3558411. PMID21669700.
Zomlefer, WB; NH Williams; WM Whitten; WS Judd (2001). "Generic circumscriptions and relationships in the tribe Melanthieae (Liliales, Melanthiaceae), with emphasis on Zigadenus: Evidence from ITS and TRNL-F sequence date". American Journal of Botany. 88 (9). Botanical Society of America: 1657–1669. doi:10.2307/3558411. JSTOR3558411. PMID21669700.
Zomlefer, WB; NH Williams; WM Whitten; WS Judd (2001). "Generic circumscriptions and relationships in the tribe Melanthieae (Liliales, Melanthiaceae), with emphasis on Zigadenus: Evidence from ITS and TRNL-F sequence date". American Journal of Botany. 88 (9). Botanical Society of America: 1657–1669. doi:10.2307/3558411. JSTOR3558411. PMID21669700.