noun Common bistort, a perennial herb of Europe and Asia, of species Bistorta officinalis (syns. Persicaria bistorta, Polygonum bistorta), formerly used as an astringent.
noun Dragon arum, a perennial herb of Greece and the Balkans, of species Dracunculus vulgaris.
noun Tarragon, an edible aromatic herb, of species Artemisia dracunculus, in the daisy family, Asteraceae.