Carnevali, G., Cetzal-Ix, W., Tapia-Muñoz, J. L., & Romero-González, G. A. (2015). The world upside down: the first <em>Kefersteinia </em>(Orchidaceae: Zygopetalinae)<em> </em>with non-resupinate flowers. Phytotaxa, 239(2), 165–173. https://doi.org/10.11646/phytotaxa.239.2.5