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Lysimachia ciliata, the fringed loosestrife, is a species of flowering plant in the family Primulaceae. It is an erect herbaceous perennial growing to 120 cm (47 in) tall and 60 cm (24 in) broad, with opposite, simple leaves, and smooth green stems. The star-shaped yellow flowers are borne in midsummer.
The floral oil and pollen of the flowers attract the Melittid bee, Macropis steironematis. This bee is a specialist visitor (oligolege) of Lysimachia spp. It collects the floral oil and pollen for its larvae. In addition, the Halictid bee Lasioglossum versatus has been observed collecting pollen from the flowers of Fringed Loosestrife. Insects that feed destructively on various parts of Fringed Loosestrife and other Lysimachia spp. include the leafhopper Rossmoneura carbonata, larvae of the sawfly Monostegia abdominalis, larvae of Dasineura lysimachiae (Loosestrife Bud Gall Midge), larvae of the moth Nola cilicoides (Blurry-Patched Nola), and leaf-mining larvae of the moth Phyllonorycter lysimachiaeella. Many of these insects are oligophagous. Little appears to be known about this wildflower's relationships with birds and mammals. This 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. Lysimachia greeneana Handel-Mazzetti; L. longipedicellata (Lunell) Handel-Mazzetti; L. membranacea (Greene) Handel-Mazzetti; Nummularia ciliata (Linnaeus) Kuntze; Steironema ciliatum (Linnaeus) Baudo; S. longipedicellatum (Lunell) Lunell; S. membranaceum Greene; S. pumilum Greene (Source: www.efloras.org)