The Aztecs called Poinsettias "Cuetlaxochitl." In the 14th to 16th centuries, the sap was used to control fevers and the bracts (modified leaves) were used to make a reddish dye. Montezuma, the last of the Aztec kings, brought Poinsettias into what now is Mexico City by caravans because Poinsettias could not be grown in the high altitude.
The ancient Aztec Indians of Mexico cultivated and regarded this plant as a symbol of purity before Christianity came to the western hemisphere. They called the plant cuetlaxochitl which means “mortal flower that perishes and withers like all that is pure.”