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Commelinaceae family

Commelina erecta Linnaeus in Sp. Pl. 1: 41.  1753.
Syn.: Commelina elegans Kunth (1816).

Zèb gwa. Water grass.
Indigenous quite rare trailing herb of semi-open and open spots in forest on the dry /moist boundary.
Anguilla, St. Martin, St. Barthélemy, Barbuda, Antigua, Saba, St. Eustatius, St. Kitts, Nevis, Montserrat, Guadeloupe, La Désirade, Marie Galante, Les Saintes, Dominica, Martinique, St. Lucia, St. Vincent, the Grenadines, Grenada, Barbados, rest of West Indies, Trinidad, North America, Mesoamerica, South America.
See also the much commoner but very similar Commelina diffusa
There is also a cultivated ornamental variegated form.