Dahlia, alias Dali Flower, Tianzhu Peony, Oriental Chrysanthemum, Dahlia, Sweet Potato Flower, Compositae, Dahlia, perennial herb, with huge rod-shaped tuberous roots. Stems erect, multi-branched, 1.5-2 meters high, stout. Originated in Mexico, it has large flower heads and long pedicels with long pedicels.