Muehlenbeckia australis

About

Muehlenbeckia australis, commonly known as the large-leaved muehlenbeckia or pōhuehue, is a species of climbing plant in the family Polygonaceae. It is native to Norfolk Island and New Zealand, where its range extends across the mainland, Stewart Island, and the Manawatāwhi / Three Kings Islands. A fast-spreading and sometimes aggressive species, it is widely considered a pest plant, smothering vegetation and forming tangles of thickets.

Summary from Wikipedia