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Cyperaceae family

Eleocharis mutata
(Linnaeus) Roemer & Schultes
, Syst. Veg. 2: 155.  1817.
Syn.: Scirpus mutatus Linnaeus (1759).

Indigenous very common herb of ditches, shallow pools of water and pond edges at lower elevations.
Anguilla, St. Martin, Antigua, Nevis, Guadeloupe, La Désirade, Marie Galante, Dominica, Martinique, St. Lucia, Grenada, Greater Antilles, Mesoamerica, South America, tropical Africa.
Triangular in cross-section - see the round Eleocharis interstincta which is found in deeper water.