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In page Sium suave:

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Sium suave grows in wetland habitats (sandy and non-sandy). These wetland habits include wet prairies, bottoms of seeps, low areas along springs, soggy thickets, swamps, borders and shallow water of ponds, marshes, and ditches.[1] It is native to both North America and Asia in Canada, the United States, Japan, Russia Federation, South Korea, and China.[2]