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Euphorbiaceae family

Euphorbia serpens
Kunth
in Humboldt, Bonpland & Kunth, Nov. Gen. Sp. 2: 41 [folio]; 2: 52 [quarto].  1817.
Syn.: Chamaesyce serpens (Kunth) Small (1903).

Indigenous common herb of open areas at lower elevations, especially coastal. Often forms a carpet in open muddy spots.
St. Martin, Barbuda, Antigua, Guadeloupe, Marie Galante, Martinique, St. Lucia, St. Vincent, the Grenadines, Grenada, Barbados, Greater Antilles, North America, Mesoamerica, South America.

Three similar species:
E. serpens has round leaves, usually solitary involucres in leaf axils, and hairless capsules.
E. prostrata has oblong leaves, involucres in groups in leaf axils, and capsules that have a fringle of long hairs on the keels, otherwise glabrous.
E. thymifolia has oblong leaves, involucres in groups in leaf axils, and capsules that are somewhat hairy on all parts.