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New Zealand here, we have this plant called Rangiora, also known as Bushman's Friend - it's soft, waxy with large leaves - it's a s close to natural toilet paper as you can get.
It's hardly my first choice when i'm out bush, but it's damn handy when you're 5 days in and the shit tickets have ran out.
You could also use it for normal paper if you really want, I've also tramped with people who chew it - it helps with bad breath, though it's a little poisonous so you need to spit it back out when you're done.