Juncus marginatus (Grassleaf Rush) is a species of perennial grass in the family rushes. They have a self-supporting growth form. They are native to Paraná, Santa Catarina, North America, Canada, The Contiguous United States, Pampa, Mata Atlântica, and Rio Grande Do Sul. They have simple, broad leaves and brown flowers. Individuals can grow to 0.65 m.
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