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Solanaceae family

Solanum americanum
Miller
, Gard. Dict. (ed. 8): Solanum no. 5.  1768. 

Agouman
Indigenous quite common herb of open and semi-open dry and moist areas.
St. Barthélemy, Barbuda, Antigua, Saba, St. Eustatius, St. Kitts, Montserrat, Guadeloupe, La Désirade, Marie Galante, Dominica, Martinique, St. Lucia, St. Vincent, Grenada, Barbados, rest of West Indies, North America, Mesoamerica, South America.
Local medicinal uses
It has been suggested to me that some specimens look like Solanum nigrescens but on close examination, I have decided that we do have a single but variable species. All our plants have a shiny black fruit and the calyx conspicuously reflexed in the fruit so I keep the name Solanum americanum based on FLA.

These images are of the more delicate type with unlobed leaves, some fruits erect, rudimentary tiny spines on lines on stem, less angular stems.  Intermediate forms are found.
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These images are of the more robust type with some lobed leaves, fruits hanging down, well-developed spines on lines on stem, more angular stems.  Intermediate forms are found.