The South African Equivalent of Bindweed?

Thunbergia in the wild

I may have been excited to see Thunbergia scrambling way up into the trees, but when I mentioned it to someone, their comment was “That thing?  It’s a weed that we are always having to pull out of the garden.”  Maybe that is winter’s gift to us – it stops a plant we treasure for its autumn colour from becoming a pest that we seek to eradicate.