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This sedge is closely related to Carex trichocarpa (Hairy-fruited Sedge) and occasionally these two species hybridize. They are indistinguishable from each other until their inflorescences are produced – Carex laeviconica (Plains Slough Sedge) has perigynia that are hairless and shiny, while Hairy-fruited Sedge has dull-colored perigynia that are covered with fine hairs. Both of these species prefer similar habitats. These large sedges are similar to Carex lacustris (Lake Sedge) and Carex hyalinolepis (Southern Lake Sedge). The latter differ primarily by having wider leaf blades (up to ¾" across) and they are more stout in appearance.

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© John Hilty

Source: Illinois Wildflowers

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