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Poaceae family

Andropogon fastigiatus
Swartz
, Prodr. 26. 1788.
Syn.: Diectomis fastigiata (Swartz) Palisot de Beauvois (1812).

Indigenous herb of moist ditch on a dry hill.
I saw this species several years running in one small area, Massade, Gros Islet but have not found it recently.    
Dominica, St. Lucia, Grenada, Greater Antilles (Puerto Rico), South America.