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This plant has been an object of my scrutiny for atvleast a year now. I cannot say how it compares to P. volubilis-- the seeds seem to be used for their oil rather than a nut, though I believe it has potential as a commercial crop. There is a description here:http://plants.jstor.org/upwta/2_250
Sorry, I should have clarified. The plants are more often grown for their seed oil, but I believe the seed itself has potential as commercial crop.