Carex leavenworthii, called Leavenworth's sedge, is a species of flowering plant in the family Cyperaceae. It is native to southern Ontario and the central and eastern United States, and it has been introduced to California and Japan. A perennial with deep green leaf blades reaching , it can tolerate a wide variety of habitats and soil types and is herbivore-resistant, and so it has found use as an ornamental and a mowable lawn grass alternative.
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