https://flora-obscura.de/en/portfolio-item/purple-yam-dioscorea-alata/
Purple yam: Dioscorea alata | Flora obscura
The eponymous violet colour of the starchy storage tissue is striking, although it can also be white.
dioscorea alatapurpleyamfloraobscura
https://hub.tmu.edu.tw/zh/publications/effects-of-different-types-of-yam-dioscorea-alata-products-on-the/
Effects of different types of yam (Dioscorea alata) products on the blood pressure of spontaneously...