Tansies are a flowering plant species. Its proper name is Tanacetum vulgare. They are also known as Bitter Buttons, Cow Bitter, or Golden Buttons.
Tansies are perennial herbaceous plants of the aster family, and are native to temperate Europe and Asia. Tansy are flowering herbaceous plant with finely divided compound leaves and yellow, button-like flowers. It has a stout, somewhat reddish, erect stem, tall, and branching near the top. The roundish, flat-topped, button-like, yellow flower heads are produced in terminal clusters. The scent is similar to that of camphor with hints of rosemary. The leaves and flowers are toxic if consumed in large quantities. They are popular gardening flowers.