Tetramerous flowers are those in which the floral organs, such as sepals, petals, and stamens, occur in multiples of four. Among the given families, Brassicaceae is characteristic for tetramerous flowers, typically having 4 sepals, 4 petals, and 6 stamens arranged in fashion. In contrast, Liliaceae generally has trimerous flowers (multiples of 3), Malvaceae usually has pentamerous flowers (multiples of 5), and Asteraceae also has pentamerous flowers, often arranged in a composite inflorescence. Therefore, tetramerous flowers are found in Brassicaceae.