So it is an oxalis. That explains how yams multiplied madly when I grew it some years ago, and it did nothing for me when I cooked it. Not something I would give garden room to. Ina On 11/11/2011 5:51 a.m., Robin Carrier wrote: > They have only sold what > > appears to be a single cultivar with smooth red tubers. I know there > > are also yellow tuber cvs and probably many more in Peru.