You can almost hear the casters drooling over having you send them seed pods.Here in AZ we have Australian Bottle Trees (Brachychiton populneus, called Kurrajong in Australia). They, too, hold water in their trunks like the Boabab trees of Africa do. The wood is very spongy, and if you hit the trunk with an axe, it sprays water all over you! We had to cut down two of them some years ago. Messy trees, too. They drop big seed pods all over everything.