乌头一种毛茛属通常有毒的多年生草本植物，有管状的根，掌状裂叶，蓝色或白色的冠状萼片的花，和骨突的集合

• Any of various,usually poisonous perennial herbs of the genus Aconitum,having tuberous roots,palmately lobed leaves,blue or white flowers with large hoodlike upper sepals,and an aggregate of follicles.