The Mexican poinsettias are commonly bright red. For some, these star-shaped bracts symbolize the Star of Bethlehem. The Christmas Poinsettia flowers have. The poinsettia (Euphorbia pulcherrima) is a commercially important plant species of the diverse spurge family (Euphorbiaceae). The species is indigenous to Mexico. It is particularly well known for its red and green foliage and is widely used in Christmas floral displays. Description · Religious and other · Creation of the American · Cultivation. Popular for decades, the colourful, long-lasting bracts form the ' flower ' and, although there are many colours, bright soldier- red is still a.