A South American plant related to wood sorrel, long cultivated in Peru for its edible tubers.
- Oxalis tuberosa, family Oxalidaceae.
- The potato was also of great importance and, with its related tubers oca and ulluco, provided crops which were protected from the frost, hail, and storms.
- Cultivated oca has an important place in the diets and farming systems of rural communities in the Andean highlands.
- Several families were harvesting bright yellow oca (a sweet potato).
Early 17th century: from American Spanish, from Quechua ócca.
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