For Hydrophyllum
Alexander, E.J. 1941. Two new species from the southern Appalachians. Castanea 6: 30-32.
Beckmann, R.L., Jr. 1979. Biosystematics of the genus Hydrophyllum L. (Hydrophyllaceae). Can J. Bot. 66: 1053-1061.
Constance, L. 1942. The genus Hydrophyllum L. Amer. Midl. Nat. 27: 710-731.
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.
Kral, R., and V.L. Bates. 1991. A new species of Hydrophyllum from the Ouachita Mountains of Arkansas. Novon 1: 60-66.
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