Acacia or Albizzia or other?

A friend used to have a tree fern, but it died. However something grew up from the base (something that had lodged in the outer hairy layer maybe?) and has produced this. It is kept indoors, and has not yet produced any flowers. She does not grow anything else like it, so it hasn't been seeded there recently. The interesting variation of the leaf form made me think it's an acacia (though it seems there are pinnate leaves BEYOND the phyllodes), but the very pinnate leaves look more like albizzia. Any suggestions please? (I attach a picture of the stem being supported by bamboo, to show where it came from!)

 

I'd say acacia.
Just in the process of going adult.

It would fit anyway, if the tree fern was from Tasmania, Acacia seed caught up in the roots would be quite normal I would think.

 

Hmm @pete you're probably right, but I'm not going to attempt to identify the species. I guess if it's from Tasmania it might be hardy enough to chance in the ground? Then it might flower and we'd stand a chance of identifying...

 

Some years ago I grew a very large tree called A.. melonoxylon, probably not that as they all look the same when young but worth a thought.

 

It has got a bit of both looking at the leaves, Albizia and the phyllodes, Acacia but I don't know if Albizia ever has phyllodes. Lets hope it can be kept to flowering size.

 

It's getting a bit tall, so will probably have to chance it outside anyway! Not sure re albizia and phyllodes - I killed the only one I've ever grown, but I recall seeing one in Paris that was definitely just pinnate leaves.

 

I had two Albizia in Alabama but they were fully grown. There are many here but again fully grown. I would not have guessed Albizia ... but I have been known to be wrong.

 

You dont get phyllodes on Albizia.
Not no never.

 

Also Albizia roots dont smell like Acacia roots do.

 

But not all acacia roots smell anyway