David J Bockman wrote:
Try http://www.mindspring.com/~psisco/www/overframe3.html

http://www.mindspring.com/~psisco/www/5species.html

It would appear that Chinkapins burrs form in small grapelike
clusters, whereas the Japanese Chestnut burrs will form in groups of
3 or so. the Japanese form's burrs will also form interlocking
patterns of hairs
(http://www.mindspring.com/%7Epsisco/...vs_Jap_Bur.jpg)
(japanese burr on right)

Dave

That is the same info I've found. ID'ing by burr won't happen until latter
in the season, if there are any at all.

For what it's worth, I believe they are showing the burrs flattened/spread
out, after they have split open to expose the nut.

Thanks