Poinsettia

Joel Roberts Poinsett died on December 12, 1851 - in his honor, Congress established December 12 as Poinsettia Day.

An excerpt from the article 16 facts about Poinsettia
On this day, people around the world buy poinsettias and give them to loved ones. Every year, more than 100 million poinsettias are sold throughout Europe, and every second one is bought as a gift. In Mexico, also on December 12, poinsettias are customarily used as decorations during the Diade la Virgen de Guadalupe, a festival celebrating the liturgical memory of the Virgin Mary of Guadalupe.