Setaria parviflora (Knotroot Foxtail) is a species of perennial grass in the family True grasses. It has a self-supporting growth form. It is native to U.S. Virgin Islands, the contiguous United States, Puerto Rico, eastern north america, Tocantins, Mato Grosso do Sul, Maranhao, Rio Grande do Sul, Roraima, Alagoas, Santa Catarina, Goiás, Pará, Bahia, Cerrado, Rio Grande do Norte, Caatinga, Amapá, São Paulo, Minas Gerais, Mato Grosso, Acre (Brazil), Pernambuco, Mata Atlântica, Distrito Federal, Espirito Santo, Piauí, Paraná, Amazônia, Rio de Janeiro, Sergipe, Paraíba, Mata Atlântica, Paraná, and Rio Grande do Sul. Knotroot Foxtail has simple, broad leaves. It is a photoautotroph. Individuals can grow to 0.25 m.
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