Cynanchum orangeanum

References

1. [1]Annals of the Missouri Botanical Garden. Volume 83 — Missouri Botanical Garden · http://www.biodiversitylibrary.org ↩︎Contains, amongst other things, an article on ethnobotany. It can be downloaded from the internet.
2. [2]Protabase - Plant Resources of Tropical Africa. — http://www.prota.org ↩︎An excellent on-line database with detailed information on over 3,200 species of useful plants of Africa.
3. [3]Gemsbok Bean and Kalahari Truffle — Leffers A. · Gamsberg MacMillan; Namibia. · 2003 · ISBN 99916-0-491-X ↩︎Details of the traditional uses of over 200 species of plants in northeastern Namibia. Written for the non-expert, there is usually at least one photograph with each plant entry.