Project 3238: R. F. Hayes, S. Y. Smith, M. Montellano-Ballesteros, G. Álvarez-Reyes, R. Hernandez-Rivera, D. E. Fastovsky. 2018. Cornalean affinities, phylogenetic significance, and biogeographic implications ofOperculifructusinfructescences from the Late Cretaceous (Campanian) of Mexico. American Journal of Botany. 105 (11):1911-1928.