For Nasturtium
Al-Shehbaz, I.A. 1988a. The genera of Arabideae (Cruciferae; Brassicaceae) in the southeastern United States. J. Arnold Arb. 69: 85-166.
Al-Shehbaz, I.A. 2010a. Brassicaceae. In Flora of North America Editorial Committee. 2010. Flora of North America north of Mexico. Volume 7, Magnoliophyta: Brassicaceae to Salicaceae. Oxford Univ. Press, New York, NY. 797 pp.
Al-Shehbaz, I.A., and R.A. Price. 1998. Delimitation of the genus Nasturtium (Brassicaceae). Novon 8: 124-126.
Franzke, A., K. Pollmann, W. Bleeker, R. Kohrt, and H. Hurka. 1998. Molecular systematics of Cardamine and allied genera (Brassicaceae): ITS and non-coding chloroplast DNA. Folia Geobotanica 33: 225-240.
Green, P.S. 1962. Watercress in the New World. Rhodora 64: 32-43.
Rollins, R.C. 1993. The Cruciferae of continental North America: systematics of the mustard family from the Arctic to Panama. Stanford Univ. Press, Stanford, CA. 976 pp.
Stuckey, R.L. 1972. Taxonomy and distribution of the genus Rorippa (Cruciferae) in North America. Sida 4: 279-430.
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