Matelea gonocarpos
Wow .,.. now here is one with lots of synonyms....[sigh]
good grief
Synonym(s): Gonolobus gonocarpos, Gonolobus suberosus, Matelea suberosa, Matelea suberosus, Vincetoxicum gonocarpos, Vincetoxicum suberosum
If you find you have far too many, I would gladly trade some thing with you.
Note that hardiness info is very confusing.