Wild potatoes - Solanum cardiophyllum - Cimatli

A friend has given me a few wild potato tubers. They look like a regular potato but they are 1 cm in diameter (less than half of an inch). He said, they are Solanum cardiophyllum, and they are being grown in Mexico under the name Cimatli or similar.
Does anyone knows such potato? Are they grown only from tubers or from seed as well?

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