what are the red christmas flowers called

The red Christmas flowers you are referring to are known as "Poinsettias" in English. Poinsettias are a popular decorative flower during the holiday season, and they are named after Joel Roberts Poinsett, the first U.S. ambassador to Mexico who introduced the plant to the United States in the mid-19th century. Poinsettias have a colorful red and green appearance, with the green leaves resembling the shape of a star at the center. The red flowers are actually called "bracts" and are not true flowers but modified leaves.