Turmeric stains! We have used it in India cookery for years ......... particularly in lentil curry.
Withania somnifera, known commonly as ashwagandha, Indian ginseng, poison gooseberry, or winter cherry is a plant in the Solanaceae or nightshade family.
Several other species in the genus Withania are morphologically similar. [Wikipedia]
Scientific name: Withania somnifera
Family: Solanaceae
Order: Solanales
potato family then?