The closest thing I can think of would be something in the castor bean family. Hopefully not! In the early 60s everyone was wearing castor bean "hippie" necklaces until people started getting sick from ricin poisoning. You mentioned Florida, maybe nuts from the Bahamas etc etc.
Anyone know any sites that deal with nuts & beans might be able to match them to a picture? Ok, with that question, let the ribbing & jokes commence!!