Which of the following flowers is an example of a line flower?

The gladiolus is indeed recognized as a line flower. Line flowers are characterized by their elongated shapes and forms that create vertical lines, which help to add height and structure to floral arrangements. The gladiolus has tall spikes of blooms that open from the bottom upwards, making it an excellent choice to add vertical elements, lead the eye upward, and enhance the overall design of a bouquet or arrangement.

In contrast, roses, carnations, and sunflowers typically have more rounded, bushy shapes. Roses are known for their dense, layered blooms, which create fullness rather than linear structure. Carnations, while they can be used effectively in arrangements, are also more rounded and provide a different texture than line flowers. Sunflowers, due to their broad faces and short stems, further emphasize a more horizontal spread rather than the vertical emphasis characteristic of line flowers. This distinction is essential for floral design, as different types of flowers contribute varied visual perspectives and structures to arrangements.