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The first natural hybrid in the section  Irapeana  of the orchid genus  Cypripedium  is described and illustrated based on Guatemalan material. A molecular evaluation of the discovery is provided. Specimens with intermediate flowers between  C. irapeanum  and  C. dickinsonianum  within ITS and  Xdh  sequences have the signal sequence of both these species. The analysis of plastid sequences indicated that the maternal line is  C. irapeanum . Information about the ecology, embryology and conservation status of the novelty is given, together with a distribution map of its parental species,  C. irapeanum  and  C. dickinsonianum . A discussion of the hybridization between  Cypripedium  species is presented. The potential hybrid zones between the representatives of  Cypripedium  section  Irapeana  which were estimated based on the results of ecological niche modeling analysis are located in the Maya Highlands ( C. dickinsonianum  and  C. irapeanum ) and the eastern part of Southern Sierra Madre ( C. molle  and  C. irapeanum ). Moreover, all three  Cypripedium  species could inhabit Cordillera Neovolcánica according to the obtained models; however, it should be noticed that this region is well-distanced from the edges of the known geographical range of  C. molle .

First Guatemalan record of natural hybridisation between Neotropical species of the Lady’s Slipper orchid (Orchidaceae, Cypripedioideae)