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Fabaceae-Faboideae  family

Desmodium scorpiurus
(Swartz) Desvaux
, J. Bot. Agric. 1: 122, t. 5, f. 13.  1813.
Bas.: Hedysarum scorpiurus Swartz (1788).

Indigenous quite common low trailing herb of moist, often sandy, flat areas by the sea.
Quite common Castries.  Very rare/absent elsewhere.
Antigua, Saba, St. Eustatius, St. Kitts, Montserrat, Guadeloupe, Dominica, Martinique, St. Lucia, St. Vincent, Grenada, Greater Antilles, Tobago, Trinidad,  Mesoamerica, South America.