What is "gonolobus condurango"

Cundurango \Cun`du*ran"go\ (k?n`d?-r?n"g?), n. (Med.) The bark of a South American vine ( Gonolobus Condurango) of the Milkweed family. It has been supposed, but erroneously, to be a cure for cancer. [Written also condurango.]

Gonolobus condurango, commonly known as Cundurango or Condurango, is the bark of a South American vine of the milkweed family.