lappa officinalis
Webster's Dictionary (GCIDE)
Burdock \Bur"dock\, n. [Bur + dock the plant.] (Bot.) A genus of coarse biennial herbs (Lappa), bearing small burs which adhere tenaciously to clothes, or to the fur or wool of animals. [1913 Webster]
Note: The common burdock is the Lappa officinalis. [1913 Webster]