se United States.
Genus 1, species 1.
Leitneriaceae are a relict family confined to the flora area and occurring on coastal and riverine flood plains of the Atlantic and Gulf coasts. The fossil record of the family extends to the Middle Oligocene (32-30 M.Y.B.P.).
Taxonomic affinities are uncertain. Various alliances have been suggested: Hamamelidales (A. Cronquist 1981), Sapindales (R. M. T. Dahlgren 1980), and Rutales (R. F. Thorne 1983) of the Rutiflorae. Biochemical studies (D. E. Giannasi 1986; F. P. Petersen and D. E. Fairbrothers 1983, 1985) suggest affinities with Simaroubaceae in Rutales.
Jarvis, C. E. 1989. A review of the order Leitneriales Engler. In: P. R. Crane and S. Blackmore, eds. 1989. Evolution, Systematics, and Fossil History of the Hamamelidae. 2 vols. Oxford. Vol. 2, pp. 189-192. [Syst. Assoc. Special Vol. 40B.]