Tyteca, D., Ceinos, M., Gathoye, J.-L., Brys, R., & Jacquemyn, H. (2012). On the morphological, biological and genetic heterogeneity of the genus Orchis (Orchidaceae, Orchidinae). Phytotaxa, 75(1), 19–32. https://doi.org/10.11646/phytotaxa.75.1.2