stavesacre means A highly toxic, perennial plant with purple flowers (Staphisagria macrosperma, syn. Delphinium staphisagria). Lexicurio rates it Sui generis — a strength score of 90 out of 100.
Etymology
Late Middle English, from Latin staphisagria, from Ancient Greek σταφίς (staphís, “grape”) (from σταφυλή (staphulḗ, “bunch of grapes”)) + ἀγρία (agría, “wild”) (literally "living in the fields," from ἀγρός (agrós, “field”)).
noun
- A highly toxic, perennial plant with purple flowers (Staphisagria macrosperma, syn. Delphinium staphisagria).