noun 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.
— synonyms: giant_willowherb, rosebay_willowherb, wickup, Epilobium_angustifolium
noun an American weedy plant with small white or greenish flowers.
— synonyms: Erechtites_hieracifolia