The Aztecs called the poinsettia "Cuetlayochitl".
Chile and Peru called the poinsettia the "Crown of the Andes".
Poinsettias have been introduced into the United States in 1825 by Joel Poinsett. Joel Roberts Poinsett was the first United States Ambassador to Mexico being appointed by President Andrew Jackson in the 1820's. During his stay in Mexico he wandered the countryside looking for new plant species. In 1828 he found a beautiful shrub with large red flowers growing next to a road. He took cuttings from the plant and brought them back to his greenhouse in South Carolina. Even though Poinsett had an outstanding career as a United States Congressman and as an ambassador he will always be remembered for introducing the Poinsettia into the United States.
The botanical name, Euphorbia pulcherrima, was assigned to the Poinsettia by the German botanist, Wilenow. The plant grew through a crack in his greenhouse. Dazzled by its color, he gave it the botanical name, Euphorbia pulcherrima meaning "very beautiful".
William Prescott, a historian and horticulturist, was asked to give Euphorbia pulcherrima a new name, as it became more popular. At that time Mr. Prescott had just published a book called "Conquest of Mexico" in which he detailed Joel Poinsett's discovery of the plant. So, Prescott named the plant the "Poinsettia" in honor of Joel Poinsett's discovery.
In honor of the beauty of this flower, December 12th has been declared the National Poinsettia Day.
(Wolford, R. 2003.)
The Legend of the Poinsettia:
A charming story tells us of Pepita, a poor Mexican girl who had no gift to present the Christ Child at Christmas Eve Services. As Pepita walked slowly to the chapel with her cousin Pedro, her heart was filled with sadness rather than joy. "I am sure, Pepita, that even the most humble gift, if given in love, will be acceptable in His eyes", said Pedro consolingly. Not knowing what else to do, Pepita knelt by the roadside and gathered a handful of common weeds, fashioning them into a small bouquet. Looking at the scraggly bunch of weeds, she felt more saddened and embarrassed than ever by the humbleness of her offering. She fought back a tear as she entered the small village chapel. As she approached the alter, she remembered Pedro's kind words: "Even the most humble gift, if given in love, will be acceptable in His eyes." She felt her spirit lift as she knelt to lay the bouquet at the foot of the nativity scene. Suddenly, the bouquet of weeds burst into blooms of brilliant red, and all that saw them were certain that they had witnessed a Christmas miracle right before their eyes. From that day on, the bright red flowers were known as the Flores de Noche Buena, or Flowers of the Holy Night, for they bloomed each year during the Christmas season.