The Collaborative International Dictionary of English v.0.48:

Peucedanin \Peu*ced"a*nin\, n. (Chem.)
   A tasteless white crystalline substance, extracted from the
   roots of the sulphurwort (Peucedanum), masterwort
   (Imperatoria), and other related plants; -- called also
   imperatorin.
   [1913 Webster]