Masterwort
Masterwort , noun
(a)
(Botany) A tall and coarse European umbelliferous plant (Peucedanum Ostruthium, formerly Imperatoria).
(b)
(Botany) The Astrantia major, a European umbelliferous plant with a showy colored involucre.
(c)
(Botany) Improperly, the cow parsnip (Heracleum lanatum).