The sign at Albertsons said, very clearly, "Yams", but the two root vegetables I put into my basket, purchased, baked, pureed and then fed to my finicky baby were not yams, but sweet potatoes under a false pseudonym. I was instructed to feed Zeke sweet potatoes only after all the other vegetables were introduced and enjoyed so as not to spoil his palate with something so sweet. Here is Zeke enjoying a bit of jicama:
I am not the only person who has been duped by the yam/sweet potato distinction. Much of North America is lumbering about in darkness on this point:
"The sweet potato is ... commonly confused with the yam in parts of North America, although they are not even distantly related to the other plant widely known as yams (in the Dioscoreaceae family), which is native to Africa and Asia." Wikipedia, http://en.wikipedia.org/wiki/Sweet_potato, 8/21/09.
I also found a picture of a true yam. That monstrosity would not fit into my oven for baking, probably feeds at least 20, and I'm positive I've never seen one in any grocery store or farmers market this side of the Missisippi.