Braun, E. L.
1950. Deciduous forests of eastern North America. The Blakiston Co.,
Philadelphia, xiv + 595 pp.
Fernald, M. L.
1950. Gray's manual of botany, 8th edition. The American Book Co.,
N. Y., lxiv + 1632 pp.
Fitch, H. S.
1952. The University of Kansas Natural History Reservation. Univ.
Kansas Mus. Nat. Hist. Misc. Publ. no. 4: 1-38.