*Imperatoria ostruthium Linnaeus. Masterwort. Phen: May-Jul. Hab: Disturbed areas. Dist: Native of Europe. Naturalized in ne. United States; reported from Carter County, TN (Chester, Wofford, & Kral 1997), and from scattered localities in PA (Rhoads & Klein 1993).
Origin/Endemic status: Europe
Synonymy: = FNA, G, MC, WV; = n/a – F; = Peucedanum ostruthium (L.) W.D.J.Koch – C, K1, K3, K4, NY, Pa
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