For Hydrophyllum
Alexander, E.J. 1941. Two new species from the southern Appalachians. Castanea 6: 30-32. Google Scholar
Beckmann, R.L., Jr. 1979. Biosystematics of the genus Hydrophyllum L. (Hydrophyllaceae). Can J. Bot. 66: 1053-1061. Google Scholar
Constance, L. 1942. The genus Hydrophyllum L. Amer. Midl. Nat. 27: 710-731. Google Scholar
Karlsson, C.H., A.S. Weakley, and D.B. Poindexter. 2017. Retention of Hydrophyllum virginianum var. atranthum as distinct from H. virginianum var. virginianum. In Weakley, A.S., D.B. Poindexter, R.J. LeBlond, B.A. Sorrie, C.H. Karlsson, P.J. Williams, E.L. Bridges, S.L. Orzell, B.R. Keener, A. Weeks, R.D. Noyes, M. Flores-Cruz, J.T. Diggs, G.D. Gann, and A.J. Floden. 2017. New combinations, rank changes, and nomenclatural and taxonomic comments in the vascular flora of the southeastern United States. II. J. Bot. Res. Inst. Texas 11: 291-325. Google Scholar
Kral, R., and V.L. Bates. 1991. A new species of Hydrophyllum from the Ouachita Mountains of Arkansas. Novon 1: 60-66. Google Scholar