Krakos, Kyra Neipp, and Scott A. Fabricant. “Generalist Versus Specialist Pollination Systems in 26 Oenothera (Onagraceae)”. Journal of Pollination Ecology 14 (September 20, 2014): 235–243. Accessed February 8, 2023. https://pollinationecology.org/index.php/jpe/article/view/289.