European creeping plant(Lysimachia nummularia)naturalized in eastern North America,having rounded,opposite leaves and single,axillary yellow flowers.

 
  • 软水草一种生在水中的东半球植物(黑藻黑藻属),叶片呈螺纹形、矛状,雌雄异株,花为单生、腋生
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