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Acanthaceae family

Barleria lupulina
, Bot. Reg. 18: t. 1483.  1832.

Hophead Philippine violet
Naturalized erect spiny herb/shrub on degraded hillsides around La Bourne,  
Native to tropical Africa, Asia.    
It is a herbal medicine in India and was perhaps introduced here by Indian immigrants. However I have no record of it being used herbally in Saint Lucia.
Occasional cultivated ornamental.