'Dane's weed' definitions:

Definition of 'Dane's weed'

From: GCIDE

Danewort \Dane"wort`\, n. (Bot.) A fetid European species of elder (Sambucus Ebulus); dwarf elder; wallwort; elderwort; -- called also Daneweed, Dane's weed, and Dane's-blood.
Note: [Said to grow on spots where battles were fought against the Danes.] [1913 Webster]