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