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Araceae family

Lemna aequinoctialis
Welwitsch, Ann. Cons. Ultramar. (Portugal), Parte Não Off., ser. 1  55: 578.  1859 (Apont.).

Indigenous aquatic floating herb of stagnant freshwater ponds.
Pond by Auberge Seraphine and pond Beausejour Gros Islet
Saint Lucia, Martinique, Guadeloupe, Antigua, Greater Antilles, the americas.

Single root.
See also Spirodela polyrhiza  
Tentative identification with help from Dr. Franck Maddi.