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Cyperaceae family

Fimbristylis quinquangularis (Vahl) Kunth, Enum. Pl. 2: 229.  1837.
Bas.: Scirpus quinquangularis Vahl (1805).

Naturalized very common herb of swampy open areas at lower and middle elevations.
Native to the paleotropics.
See also the similar but very rare Fimbristylis miliacea