Jyves,
I may be so wrong and sure won't be the first or last time.
Though the picture you have posted looks to me like what we call the buckeye, I have searched and can't find any pictures of what you say is the chinese chestnut.
I live in the buckeye state and thus the reason for the when asked where you come from and say Ohio you are called the "worthless nut" as the buckeye has no use that I'm aware of.
Now I know that there is a candy called the buckeye that I love which is peanut butter balls dipped in choc. made to look like a buckkeye.
I'll be interested in seeing if any knows the difference in these "nuts"!
LindaM(suede)