bed·straw /-ˌstrɔ/
  篷子類植物
  Bed·straw n.
  1. Straw put into a bed.
  2. Bot. A genus of slender herbs, usually with square stems, whorled leaves, and small white flowers.
  Our Lady's bedstraw, which has yellow flowers, is Galium verum.
  White bedstraw is Galium mollugo.
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  bedstraw
       n : any of several plants of the genus Galium