This is the 13th set in the UNPA’s series, Endangered Species. This year’s set highlights orchids. Vanda coerulea, Cycnoches spp., Cattleya trianae, and Aerangis modesta appear on the Offices in New York stamps. The Christmas Orchid, or Cattleya trianae, grows on the upper canopy of tall trees throughout tropical America. It is the national flower of Colombia.