Euphorbia subg. Poinsettia Euphorbia subg. Poinsettia Euphorbia" subg. "Poinsettia is a subgenus deriving from the genus "Euphorbia", and is endemic to North America. <nowiki> </nowiki>It contains around 24 species, of which the best known is "E. pulcherrima", the poinsettia. This species grows wild in the mountains on the Pacific slope of Mexico, and despite many legends, no one is quite sure from which wild populations the cultivated varieties derive. This taxon was first published at genus rank under the name Poinsettia by Robert Graham in 1836. It was demoted to a section of "Euphorbia" as E." sect. "Poinsettia by Henri Ernest Baillon in
Poinsettia is called "bent el consul", "the consul's daughter", referring to the U.S. ambassador Joel Poinsett. There are over 100 cultivated varieties of poinsettia. In areas outside its natural environment, it is commonly grown as an indoor plant where it prefers good morning sun, then shade in the hotter part of the day. Contrary to popular belief, flowering poinsettias can be kept outside, even during winter, as long as they are kept frost-free. It is widely grown and very popular in subtropical climates such as Australia, Rwanda and Malta. The plant requires a daily period of uninterrupted long, dark nights followed