Poinsettia (Euphorbia pulcherima), from Mexico and Central America, is a shrub (to 15 ft). An American's symbol of Christmas.
It's whorls of upper leaves, red, pink, white, salmon, or varigated, masquerading as blooms are actually splendid ruffs encircling the true, yellow & green flowers.
When your poinsettia starts to drop its leaves and look ugly, don't throw it away.
Dip them in rooting compound and stick them in potting soil.