For Dirca
Floden, A., and L.I. Nevling, Jr. 2015. Dirca. In Flora of North America Editorial Committee. 2015. Flora of North America north of Mexico. Volume 6, Magnoliophyta: Cucurbitaceae to Droseraceae. Oxford Univ. Press, New York, NY. 468 pp.
Floden, A.J., M.H. Mayfield, and C.J. Ferguson. 2009. A new narrowly endemic species of Dirca (Thymelaeaceae) from Kansas and Arkansas, with a phylogenetic overview and taxonomic synthesis of the genus. J. Bot. Res. Inst. Texas 3: 485-499.
Nevling, L.I., Jr. 1962. The Thymelaeaceae in the southeastern United States. J. Arnold Arb. 43: 428-434.
Schrader, J.A., and W.R. Graves. 2004. Systematics of Dirca (Thymelaeaceae) based on ITS sequences and ISSR polymorphisms. Sida 21: 511-524.
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