What flowers are native to Mexico and used in their holiday celebration?

There are two of them. One is the Poinsettia (Euphorbia pulcherrima), usually displayed on Christmas celebrations and named in Mexico as Flor de Nochebuena. The other one is the Mexican Marygold (Tagetes erecta), also named Flor de muertos, cempasuchil or zempoalxochitl, which is used during the Day of the Dead celebration.