In my definition: http://paleodiet.com/definition.htm

I list roots/tubers as an "in" food (with the exception of potatoes) 
and by not discussing this further I imply that a diet composed 
almost entirely of them is paleo.

Besides potatoes, are there other ones to avoid? Many seem to be 
inedible raw. If you accept Wrangham's hypothesis that humans became 
tuber eaters when we moved from the rain forest to the savanna, then 
they all are paleo.

Is there some general way of classifying into which are edible raw 
and which aren't?

I suppose I could include a short paragraph on cooking. My only 
mention now of the word cooking is in the NeanderThin entry. But the 
data is so thin as to when.

Don.