Why are poinsettia has red patches on it's bracts?

The red patches on a poinsettia's bracts are actually modified leaves, not flowers. These vibrant colors are a result of pigments called anthocyanins, which help attract pollinators and signal the plant's readiness for reproduction. The color change is also influenced by environmental factors, particularly light exposure and temperature, as the plant responds to the shorter days of winter. This adaptation enhances its visual appeal during the holiday season, making it a popular ornamental plant.