Poinsettia harmful in experiments. An Ohio State University study showed no problems even with extremely large doses. Poinsettia The poinsettia ( or ) ("Euphorbia pulcherrima") (also known as "Christmas Star") 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. It derives its common English name from Joel Roberts Poinsett, the first United States Minister to Mexico, who introduced the plant to the US in 1825. "Euphorbia pulcherrima" is a shrub or small tree,
Plant development forms is referred to as 'vegetative phase change', but there is some disagreement about terminology. Plant structures, including, roots, buds, and shoots, that develop in unusual locations are called "adventitious". Such structures are common in vascular plants. Adventitious roots and buds usually develop near the existing vascular tissues so they can connect to the xylem and phloem. However, the exact location varies greatly. In young stems, adventitious roots often form from parenchyma between the vascular bundles. In stems with secondary growth, adventitious roots often originate in phloem parenchyma near the vascular cambium. In stem cuttings, adventitious roots sometimes also originate