Michael V said:

roughbarked said:

Michael V said:

I was in part wrong. It’s not a native. It is an invasive ornamental. Yellow allamanda – Allamanda cathartica.

https://www.business.qld.gov.au/industries/farms-fishing-forestry/agriculture/biosecurity/plants/invasive/other/yellow-allamanda

Yes. It is invasive enough to argue with a bougainvillea.

I think it just climbs the Bougainvillea.

Yes. Most other plants cannot.