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Swamp Loosestrife is both large in size and attractive, especially when it is in bloom. Its two closest relatives in Illinois, the native Lythrum alatum (Winged Loosestrife) and introduced Lythrum salicaria (Purple Loosestrife), prefer somewhat drier areas of wetlands. Compared to Swamp Loosestrife, both of these species have very similar purple flowers, but they are both erect in their habit of growth, rather than arching.


Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© John Hilty

Source: Illinois Wildflowers

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