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R. Contreras, Ruter, J. M., Conner, J., Zeng, Y., and Ozias-Akins, P., Interspecific hybridization in Tecoma Juss. (Bignoniaceae): Confirmation of hybridity using GISH and morphology. 2011.
R. Contreras, Breeding methods to reduce the invasive potential of nursery crops. 2010.
R. Contreras and Ruter, J. M., Fruit color in American beautyberry is controlled by a single gene. 2010.
R. Contreras and Ruter, J. M., An oryzalin induced polyploidy from a hybrid of Hibiscus acetosella x H. radiatus(Malvaceae) exhibits reduced fertility and altered morphology. 2009.
R. Contreras and Ruter, J. M., Evaluation of Callicarpa spp. for ornamental potential. 2008.
R. Contreras and Ranney, T. G., Reproductive behavior of diploid and allotetraploid azaleodendrons. 2006.
R. Contreras, Ornamental Plant Breeding at Oregon State University, Combined Proceedings of the International Plant Propagators' Society 63. 2014.
R. Contreras and Ruter, J. M., Evaluation of Callicarpa spp. for utilization in a breeding program, Georgia Green Industry Association Journal, pp. 32-33, 2008.
R. Contreras and Ruter, J. M., Callicarpa evaluation and breeding at The University of Georgia Tifton Campus, Landscape Plant News, vol. 20(2), pp. 3-5, 2009.
R. Contreras and Ruter, J. M., Developing an evergreen, evergreen: Winter browning in Japanese cedar, Amer. Conifer Soc. Quarterly J., vol. 27(1), pp. 19-23, 2010.
R. Contreras, Bridging the gap: A new partnership between Oregon State University and LPDC designed to continue cultivar development., Landscape Plant News, 2010.
R. Contreras, Bred for success, Digger, pp. 41-45, 2011.
R. Contreras and Owen, J. S., The Economy of Water, Digger, pp. 139-144, 2011.
R. Contreras and Rinehart, T., An express route to perfection, Digger, pp. 47-50, 2012.
R. Contreras and McAninch, G., Back from the ban: new Buddleja cultivars receive exemption under ODA amendment, Digger, pp. 33-36, 2013.
R. Contreras and Horn, M., Breeding to improve garden performance of Penstemon in the Willamette Valley: early stages, Bulletin of the American Pestemon Society, vol. 73, pp. 68-72, 2014.
R. Contreras and Lattier, J. D., Improving a garden classic., Digger, pp. 47-50, 2014.

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