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|Noun||1.||giant willowherb - tall North American perennial with creeping rootstocks and narrow leaves and spikes of pinkish-purple flowers occurring in great abundance in burned-over areas or recent clearings; an important honey plant|
Epilobium, genus Epilobium - large widely distributed genus of herbs and subshrubs of especially western North America and Arctic areas
willowherb - a plant of the genus Epilobium having pink or yellow flowers and seeds with silky hairs