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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 Owen, J. S., The Economy of Water, Digger, pp. 139-144, 2011.
R. Contreras, Owen, J. S., Hanna, W., and Schwartz, B. M., Evaluation of Seven Complex Pennisetum Hybrids for Container and Landscape Performance in the Pacific Northwestern United States, HortTechnology, vol. 23, no. 4, 2013.
R. Contreras and Ranney, T. G., New opportunities for breeding fragrant rhododendrons, Journal of American Rhododendron Society, vol. 62, no. 4, 2008.
R. Contreras and Ranney, T. G., New opportunities for breeding allopolyploid azaleodendrons, Proc. 49th Ann. SNA Res. Conf., vol. 49:552-554. 2004.
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, A Simple Chromosome Doubling Technique Is Effective for Three Species of Cupressaceae, HortScience, vol. 47, no. 6, pp. 712-714, 2012.
R. Contreras and Lattier, J. D., Improving a garden classic., Digger, pp. 47-50, 2014.
R. Contreras, Determann, R., and Friddle, M. W., Differences in Winter Browning among Japanese-cedar Cultivars Are Not Due to Variation in Ploidy Levels, HortScience, vol. 46, no. 11, 2011.
R. Contreras, Friddle, M. W., and Lattier, J. D., Relative fertility and ploidy levels of selected rose of sharon cultivars, Proc. 58th Ann. SNA Res. Conf., vol. 58:232-236. 2013.
R. Contreras and Ruter, J. M., Fruit color in American beautyberry is controlled by a single gene. 2010.
R. Contreras, Bred for success, Digger, pp. 41-45, 2011.
R. Contreras, Ruter, J., Owen, J. S., and Hoegh, A., Chlorophyll, Carotenoid, and Visual Color Rating of Japanese-cedar Grown in the Southeastern United States, HORTSCIENCE , vol. 48, no. 12, 2013.
R. Contreras, Ruter, J., and Hanna, W., An Oryzalin-induced Autoallooctoploid of Hibiscus acetosella ‘Panama Red’, Journal of American Horticultural Science, vol. 134, no. 5, 2009.
R. Contreras, Ranney, T. G., Tallury, S. P., and Milla-Lewis, S. R., Using molecular markers to investigate parentage of azaleodendron hybrids., Proc. 50th Ann. SNA Res. Conf., vol. 50:632-635. 2005.
R. Contreras, Ornamental Plant Breeding at Oregon State University, Combined Proceedings of the International Plant Propagators' Society 63. 2014.
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, Ruter, J. M., Conner, J., Zeng, Y., and Ozias-Akins, P., Confirmation of hybridity using GISH and determination of 18S rDNA copy number using FISH in interspecific F 1 hybrids of Tecoma (Bignoniaceae), Genome, vol. 55, no. 6, pp. 437 - 445, 2012.
R. Contreras, Rothleutner, J. J., and Stockwell, V., Breeding for fire blight resistance and sterility in Cotoneaster, Proceedings of the 13th International Workshop on Fire Blight. Acta Hort, vol. 1056:221-223. 2014.
R. Contreras, Breeding methods to reduce the invasive potential of nursery crops. 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 and Friddle, M. W., ‘Oregon Snowflake’ Flowering Currant, HORTSCIENCE , vol. 50, no. 3, 2015.
R. Contreras and Ruter, J., Sulfuric acid scarification of Callicarpa americana L. (Lamiaceae) seeds improves germination, Native Plants Journal, vol. 10, no. 3, 2009.
R. Contreras and Ruter, J. M., New Callicarpa species with breeding potential, Proc. 52nd Ann. SNA Res. Conf., vol. 52:327-329. 2007.
R. Contreras and Ranney, T. G., Reproductive behavior of diploid and allotetraploid azaleodendrons. 2006.

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