WordNet (r) 3.0 (2006):
rosebay willowherb n 1: 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 [syn: fireweed, giant willowherb, rosebay willowherb, wickup, Epilobium angustifolium]