Dioscorea dregeana, the wild yam, is a perennial creeper that is native to the eastern parts of southern Africa. It is commonly used and traded as a traditional medicine, or muti.
It is native to eastern South Africa and Swaziland.
A slightly thorny stem sprouts annually from a tuberous rootstock. The plant becomes dormant in winter.
Media related to Dioscorea dregeana at Wikimedia Commons
Data related to Dioscorea dregeana at Wikispecies