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R. Contreras, Ruter, J., and Knauft, D., Flower, fruit, and petiole color of american beautyberry (Callicarpa americana L.) are controlled by a single gene with three alleles, HortScience, vol. 49, no. 4, pp. 422-424, 2014.
R. Contreras and Meneghelli, L., In Vitro Chromosome Doubling of Prunus laurocerasus ‘Otto Luyken’ and ‘Schipkaensis’, HortScience, vol. 51, no. 12, pp. 1463 - 1466, 2016.
R. Contreras and Friddle, M. W., ‘Oregon Snowflake’ Flowering Currant, HORTSCIENCE , vol. 50, no. 3, 2015.
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, 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, Velez, J., and Golembiewsk, R., Are Learning Styles, Study Habits, and Performance Correlated in Woody Plant Identification Students?, HortTechnology, 2013.
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, 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 and Ruter, J., Genome Size Estimates and Chromosome Numbers of Callicarpa L. (Lamiaceae), HortScience, vol. 46, no. 4, 2011.
R. Contreras, Ruter, J., and Schwartz, B. M., Oryzalin-induced Tetraploidy in Cryptomeria japonica (Cupressaceae), HortScience, vol. 45, no. 2, 2010.
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, 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 and Ranney, T. G., New opportunities for breeding fragrant rhododendrons, Journal of American Rhododendron Society, vol. 62, no. 4, 2008.
R. Contreras, Ranney, T. G., and Tallury, S. P., Reproductive behavior of diploid and allotetraploid Rhododendron L. ‘Fragrant Affinity’, HortScience, vol. 42, no. 1, 2007.
R. Contreras, Ranney, T. G., Milla-Lewis, S. R., and Yencho, G. C., Investigating parentage and hybridity of three azaleodendrons using AFLP analysis, HortSCience, vol. 42, no. 3, 2007.
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 Friddle, M. W., Fire blight resistance among interspecific and interploidy F1 hybrids of Cotoneaster, Proc. 60th Ann. SNA Res. Conf. 60:XXX-XXX. 2015.
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, 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., Induced polyploidy in Japanese cedar, Proc. 55th Ann. SNA Res. Conf., vol. 55:25-29. 2010.
R. Contreras and Ruter, J. M., Preliminary efforts to induce polyploidy in Cryptomeria japonica., Proc. 53rd Ann. SNA Res. Conf., vol. 53:159-161. 2008.
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, 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 and Ranney, T. G., New opportunities for breeding allopolyploid azaleodendrons, Proc. 49th Ann. SNA Res. Conf., vol. 49:552-554. 2004.
R. Contreras and Meneghelli, L., In Vitro Chromosome Doubling of Prunus laurocerasus ‘Otto Luyken’. 2013.

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