Costea, M. (Department of Biology, Wilfrid Laurier University, ON, Canada, N2L 3C5; mcostea@wlu.ca), G. L. Nesom (Botanical Research Institute of Texas, 509 Pecan Street, Fort Worth, TX 76102-4060, U.S.A.; gnesom@brit.org) & F. J. Tardif (Department of Plant Agriculture, University of Guelph, Guelph, ON N1G 2W1, Canada; ftardif@uoguelph.ca). Taxonomic status of Cuscuta nevadensis and C. veatchii (Convolvulaceae) in North America. Brittonia 57: 264–272. 2005.—The taxonomy of Cuscuta nevadensis and C. veatchii is investigated. Cuscuta nevadensis is more closely related to C. veatchii and C. denticulata than to C. salina, and the former two taxa are accepted as species. A summary of relevant taxonomic and biological information is provided, including synonymy, distribution and ecology, keys, and a comparison of the morphology of flowers and seeds are examined. The morphological basis of vivipary in C. nevadensis is discussed. The status of Cuscuta vivipara, an invalid name in recent use, is clarified.