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Linderniaceae family

Micranthemum umbrosum
(J. F. Gmelin) S. F. Blake
, Rhodora 17(199): 131.  1915.
Bas.: Globifera umbrosa J. F. Gmelin (1791). 

Indigenous very rare semi-aquatic creeping herb of ditches and along river edges.
Guadeloupe, Dominica, St. Lucia, Grenada, Bahamas, Greater Antilles, Trinidad, North America, Mesoamerica, South America.
So far I have not observed flowers.