Pyne, M., S. L. Orzell, and E. L. Bridges. “Physalis Macrophysa (Solanaceae: Physalinae: Subgenus Rydbergis), Its Taxonomic Disposition and Relation to Other Material With Large Inflated Fruiting Calyces”. Journal of the Botanical Research Institute of Texas, vol. 13, no. 1, July 2019, pp. 51-61, doi:10.17348/jbrit.v13.i1.825.