fireweed

(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; an important honey plant. Synonyms: giant willowherb, rosebay willowherb, wickup, Epilobium angustifolium.

(noun) an American weedy plant with small white or greenish flowers. Synonyms: Erechtites hieracifolia.