I have been around and around with this plant, received as D. natalensis which ID was confirmed by Robert Gibson. It seems very atypical to me if it is D. natalensis (there is only so much to see in a photo without a flower!
. Recent photos of Debbert's new species novae D. afra are reminiscent of this plant. I believe other authors lean towards accepting this species novae as a form of D. trinervia. I am burning to ID this plant, if anyone can assist.