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CommentsThis is one of the more common Lysimachia spp. (Loosestrife species). As a group, they are not closely related to Lythrum spp. (Purple Loosestrife species). Fringed Loosestrife can be distinguished from other Lysimachia spp. by the conspicuous hairs on its petioles. It tends to be more robust and have wider leaves than other species in this genus. Most Lysimachia spp. in Illinois have similar yellow flowers that produce floral oil, although these flowers sometimes differ in size. Another species, Lysimachia thyrsiflora (Tufted Loosestrife), has flowers with very narrow petaloid lobes that are bunched together into dense clusters. This provides it with a distinctive appearance.