loosestrife: a cosmopolitan genus found in damp or swampy terrain having usually yellow flowers; inclined to be invasive.
珍珠菜;在潮湿的或沼泽的地带通常长有黄色花的四海为家的属。
However, the swampy terrain was a breeding ground for mosquitoes, which carried a variety of diseases - dysentery, malaria, smallpox - that the English were unaccustomed to.