1. Barneby, R. C. 1977. Daleae Imagines. Mem. New York Bot. Gard. 27: 1–892.
2. Gray, A. 1872. Botanical contributions. Proc. Amer. Acad. Arts 8: 365–412.
3. Marcy, O. 1872. Report of the Department of Natural History, addressed to the President (dated June). Northwestern University, Evanston, Ill.