<i>Catasetum × luanae</i> (Orchidaceae, Catasetinae): a new nothospecies from the Brazilian Central Amazon

A new natural hybrid of Catasetum is illustrated with photographic plates and described here based on collections made in the Trombetas River basin, in the municipality of Oriximiná, state of Pará (Brazilian Amazon). It is compared with the parental species (C. galeritum and C. macrocarpum), with which it shares characteristics that are clearly intermediate between these two taxa. Data relating to the habitat, ecology and geographic distribution of the hybrid described here are also presented. This finding reinforces the Amazon region as a center of diversification for Catasetum.