I think it looks like Dombeya, which is not something I know (I queried Malvaceae inflorescence), but here's a photo of Dombeya burgessiae: File:Lisbon botanical garden 10-Dombeya burgessiae-flowers.JPG - Wikimedia Commons
ahh, that makes sense. I've seen Dombeyas so many times elsewhere but this is the only one I noticed in NZ so it was off my radar...