A tall and coarse European umbelliferous plant (Peucedanum Ostruthium, formerly Imperatoria).

The Astrantia major, a European umbelliferous plant with a showy colored involucre.

Peucedanum ostruthium, a perennial herb with divided leaves and an aromatic root. It is also called Imperatoria.

any plant of the genus Astrantia

Masterwort typically refers to the plant Peucedanum ostruthium or Imperatoria ostruthium in the family Apiaceae, and not to be confused with great masterwort, Astrantia major, in the same family.