I'm not sure which shrub or tree you might be seeing based on that description. It might be a Jerusalem thorn (Parkinsonia aculeata). The following web site shows a photo and more info on that plant:
If this is not your mystery plant I suggest you contact the horticulturist at your Orange County Extension Office. They should be able to get a more detailed description and tell you the identity of your mystery plant.
2350 East Michigan Street
Orlando, FL 32806
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