from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A perennial herb of Europe and Asia, variously named Persicaria bistorta, syn. Polygonum bistorta, formerly used as an astringent.
- n. A perennial herb of Greece and the Balkans, Dracunculus vulgaris.
from The Century Dictionary and Cyclopedia
- n. The bistort, Polygonum Bistorta, and with the old herbalists the green dragon, Dracunculus vulgaris.
dragon + wort (Wiktionary)
It's scientific name is dracunculus vulgaris, but is known variously as the dragon arum, stink lily, black arum, voodoo lily, snake lily, black dragon, dragonwort and Ragons.