Iva xanthiifolia, synonym Cyclachaena xanthiifolia, known as giant sumpweed or, in Britain and Ireland, marsh-elder, is a North American plant species in the sunflower family. It is believed to be native to the Great Plains but now found across much of southern Canada and the contiguous United States, though rarely in the Southeast. It has been introduced and semi-naturalized in central and southern Britain, partly via seeds bought for bird food.It is an annual herb roughly 18 to 72 inches (1.5 to ...
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*All information is based on published scientific research