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Fabaceae-Faboideae  family

Desmodium incanum
de Candolle var. angustifolium Grisebach
, Fl. Brit. W. I. 187. 1859.??
Bas.: Hedysarum angustifolium Kunth (1824).
Syn. Desmodium angustifolium (Kunth) de Candolles (1825).

Herb of Atlantic coastal savanna, Gros Islet.
St. Barthélemy, Barbuda, Antigua, Nevis, Montserrat, Guadeloupe, Marie Galante, Martinique, St. Lucia, St. Vincent, Barbados, Greater Antilles, North America, Mesoamerica, South America.
Has trifoliate narrow leaves which become unifoliate by abscission in the dry season and on drying. It forms carpets over large areas and in the field appears quite distinct from Desmodium incanum de Candolle var. incanum even when found in the same spot.
However probably just a variant of de Candolle var. incanum as the leaves are trifoliate to start with. The fruit is the same shape as Desmodium incanum de Candolle var. incanum but with only 2 seeds.