Cattleya trianae (Lind. & Rchb. fil), also known as Flor de Mayo ("May flower") or "Christmas orchid", is a plant of the family Orchidaceae. It grows as an epiphytic orchid, with succulent leaves, endemic to Colombia where it was nominated as the national flower in November 1936. That year, the National Academy of History of Argentina asked the Latin American countries to participate in an exhibition with the representative flowers of each country. The Colombian governmen