Sain, M.P., Norrell-Tober, J., Barthel, K., Seawright, M., Blanton, A., Hertweck, K.L., Placyk, Jr., J.S., Small, R., Williams, L.R., Williams, M.G. and Banta, J.A. 2021. Multiple complementary studies clarify which co-occurring congener presents the greatest hybridization threat to a rare Texas endemic wildflower (Hibiscus dasycalyx: Malvaceae). Journal of the Botanical Research Institute of Texas. 15, 1 (Jul. 2021), 283-308. DOI:https://doi.org/10.17348/jbrit.v15.i1.1064.