andrie- was just gonna mention white stinkwood, but then saw your signature. might also try some of the pecan nut orchards/growers, they often thin/ prune trees.
of course all the fruit trees.
i believe they were growing some osage down there too- it was being sold as hedges to keep the bad ou's out. believe there was a nursery around P.e. selling it- will ask my mum again!
my grandpa used a tree called a "vier hoek"
had 4 berries in cluster, and lotsa thorns- know that wont help much!!- but it was pretty good selfbow wood.
g'luck
wayne