I didn't think Hirt's photos were of their own yacon. So many plant photos seem to get stolen. It happened all the time with people selling fig cuttings on ebay. Not only stolen photos, but mis-identified varieties. And until you grow them up, maybe taking 2 years to get the first fruit, there is no way to know.
I really would like to get some starts of a second yacon variety now since I can grow them year-round here. But I'm not sure that's possible at the moment especially since I would prefer an accurate I.D. Guess I'll have to be patient.
As for counting chromosomes, 12 sets would have to be a mess, lol. 8 sets would be bad enough.