Persicaria bistorta
Names: Persicaria.
English: Bistort, Common Bistort, Adderwort, Dragonwort, Easter giant, Easter ledger, Easter ledges, Easter magiant, Easter man-giant, Gentle dock, Great bistort, Osterick, Oysterloit, Passion dock, Patience dock (this name is also used for Rumex patientia), Patient dock, Pink pokers, Pudding grass, Pudding dock, Red legs, Snakeweed, Twice-writhen, Water ledges, English Serpentary, Dragonwort, Osterick, Passions.
Use: food, puddings.