Photo and text by Bob Stewart
We got this plant (our accession #11676) labelled as Drymonia oinochrophylla. It bears no resemblance to the plants in the Smithsonian herbarium by that name. Nobody else has claimed to know what it is.
It grows easily, and is a branching vine, extending several feet, becoming woody. The leaves are modest size, thick, hairless, rather like a Nematanthus. The flowers are quite attractive, but also quite infrequent.