Jamaican/Caribbean insect, plant identification keys/field guides
I've never been to nor botanized Jamaica or the Caribbean, but a quick Google search turned up the following references for Jamaican plants:


Iremonger, S., 2002. Guide to the Plants in the Blue Mountains of Jamaica. University of West Indies Press, 280p. ISBN: 9789766400316
Fawcett, W. and A. B. Rendle. 1910. Flora of Jamaica, containing Descriptions of the Flowering Plants known from the island. Longmans &amp; Company. Found here. 


 

You can also find a list of Jamaican species on Wikipedia and a list of medicinal plants in Jamaica here.