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 loose·strife /ˈlu(s)ˌstraɪf/
 珍珠菜

 Loose·strife n. Bot. (a) The name of several species of plants of the genus Lysimachia, having small star-shaped flowers, usually of a yellow color. (b) Any species of the genus Lythrum, having purple, or, in some species, crimson flowers. --Gray.
 False loosestrife, a plant of the genus Ludwigia, which includes several species, most of which are found in the United States.
 Tufted loosestrife, the plant Lysimachia thyrsiflora, found in the northern parts of the United States and in Europe.
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 loosestrife
      n 1: any of numerous herbs and subshrubs of the genus Lythrum
      2: any of various herbs and subshrubs of the genus Lysimachia