National Botanic Garden of Wales, United Kingdom

Common name: llysiau'r neidr, llys y neidr, common bistort, adderwort, dragonwort, Easter giant, Easter ledges, Easter magiant, Easter man-giant, gentle dock, great bistort, osterick, passion dock, patience dock, red legs, snakeweed

Family: Polygonaceae (buckwheat family)

Synonym: Bistorta officinalis, Polygonum bistorta

Distribution: Eurasia, Morocco

Hardiness: (H7) Very hardy. < -20°C (USDA 6a-1)

Life form: Perennial plant • Planhigyn lluosflwydd

Geirdarddiad / Etymology: Persicaria (per-sih-KAR-ee-uh): Peach-like, referring to the leaves.

Geirdarddiad / Etymology: officinalis (oh-fiss-ih-NAH-liss): Official - used in pharmacological sense.

Description: A vigorous rhizomatous perennial to 1 metre tall, with prominently veined, ovate leaves to 30cm long, and dense spikes of small pale pink flowers in summer and early autumn.