This native relative of passion-fruit is a slender climber of tropical and sub-tropical eastern Australia and New Guinea, where it grows in drier types of rainforest (monsoon forest, vine-thicket, beach forests).
The flowers are cramy-white when they first open, turning red as they develop fully.
I planted this because it is a food plant for caterpillars of the Cruiser butterfly. This might be wishful thinking as I’ve never seen this butterfly around my home; it occurs in wetter areas not too far away.