Roble is oak, and we have the flowering variety, which can be seen here planted all along the Avenida Bolivar
Flamboyan or Framboyan is the Flame Tree or Royal Poinciana
Ebano Verde, (of the magnolia family) a tree that doesnt get mentioned much and is found in Los Haitises, it is one of the real treasures here
We also have here the very beautiful Orquidea de Pobre or Bauhinia tree, a lovely example of which can be seen on the corner of Cervantes and Casimiro Moya, along with another exquisite flowering tree, the Ca?afistola Mansa, or Yellow Cassia (which maybe what you mean by acacia amarilla?)
of course, along with our famous Caoba (Dominican mahogany being in fact the best in the world) we also have another incredibly durable hardwood which was harvested back in colonial times, the Guayacan or lignum vitae. Surviving Taino relics are often made of this stonelike dense dark wood.
While the Flamboyan is not flowering just now (wait for late Spring/summer), I noticed that all the Amapola trees are flowering again (I guess there must be two flowering seasons), This imported tree, subject of many country songs and merengues, is known in English as the African Tulip Tree (Spathodea campanulata).
And let's not forget the incredibly huge and stately Almond trees, Almendro, that line many of the streets in Gazcue, particularly around Lea de Castro and Pasteur.
Gri gri may not have an English name. Its scientific name is Bucida Buceras, and in Puerto Rico it is called caracol?.
A fair pamphlet with color pix, called Flowers of the Caribbean, by G.W Lennox and S.A. Seddon can be had from Amazon (though without the Spanish names) and a book intended more for botanists is Arboles Dominicanos by Alain Henri Liogier, but the illustrations are not in color, and that is frustrating.