fire·weed /-ˌwid/
  雜草
  Fire·weed n. Bot. (a) An American plant (Erechthites hiercifolia), very troublesome in spots where brushwood has been burned. (b) The great willow-herb (Epilobium spicatum).
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  fireweed
       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: giant
            willowherb, rosebay willowherb, wickup, Epilobium
            angustifolium]
       2: an American weedy plant with small white or greenish flowers
          [syn: Erechtites hieracifolia]