In article , Iris Cohen
writes
There is an equally or more poisonous tree native to Florida and the Caribbean,
the manchineel, Hippomane mancinella. People are warned not to sit under it,
because dripping sap can cause a severe rash. The two trees are not related.

There's always _Tilia tomentosa_ (from S.E. Europe) which is reported as
killing (bumble) bees. One anecdote is that there were so many dead bees
under the edge of one tree that there was a circular zone of enhanced
soil fertility the next year.
--
Stewart Robert Hinsley