Gardening Australia

I'm not sure if they are the native ones but based on those descriptions it does seem like it. They were already there when my parents moved in. The flower has a very strong, pleasant smell and matches the description. They've also never really been looked after specifically and have survived all the various weather conditions Australia throws at them, so maybe that is another hint that they are native.

I will plant some of the smaller ones as is and try cutting the more cumbersome sized ones for potting and see what happens. Thanks for your help!