What tree is this?

I was out in KwaMashu earlier this week, conducting training for INK Urban Renewal, and this tree was all over the place.  I originally noticed it because its remarkable pods make a great rustling noise when the wind blows.  Does anyone recognise it?  Is it indigenous?  I took a couple of seeds and may try to germinate it.

Mystery Tree.

Mystery Tree.

Rustling tree.

Rustling tree.

Remarkable pod.

Remarkable pod.

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