The term 'Mexican Flower' can be broken down into three crossword solutions: Rio (3 letters), DAHLIA (6 letters), and Tuberose (8 letters). Rio is a genus of flowering plants in the family Iridaceae, native to South America. Dahlias are a genus of bushy, tuberous, herbaceous perennial plants native to Mexico. Tuberose is a species of perennial herb native to Mexico and Central America. All three of these flowers are popularly grown in Mexico and are often used in traditional Mexican floral arrangements.