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Rubiaceae family

Spermacoce tetraquetra
A. Richard
, Hist. Fis. Cuba Bot. 11: 29.  1850.

Indigenous rare herb of open seasonally swampy low areas.
I have observed this species around Beausejour, Gros Islet and Union, Castries.
St Lucia, Barbados, Bahamas. Greater Antilles (Cuba, Jamaica), Mesoamerica.