"Royal Poinsettia" is not a tree. It is a variety of the Poinsettia plant (scientific name: *Euphorbia pulcherrima*), which is a shrub or small tree native to Mexico and Central America.

The name "Poinsettia" is derived from Joel Roberts Poinsett, the first United States ambassador to Mexico, who introduced the plant to the United States in the 1820s.

While Poinsettias can grow quite large and have a tree-like appearance, they are not considered true trees due to their structural differences.