You were on the right track but the photos show a hybrid, Aesculus pavia (red buckeye) x Aesculus hippocastanum (horse chestnut). The cultivar is either 'Briotii' or 'Fort McNair'. They are similar and somewhat confused in cultivation. There are good specimens at the Linda Hall Science Library in Kansas City. I know they are not edible but not sure if they are poisonous or just bad tasting. Sometimes these are called 'Red Horse Chestnuts'. The sweet chestnut has fingers of tiny white flowers that stink to high heaven.
On Fri, Nov 23, 2012 at 6:15 PM, Pat <Pat.Creighton@shaw.ca>
Aesculus pavia - buckeye
Aesculus hippocastanum - horse chestnut
8871 NW Brostrom Rd
Kansas City, MO 64152-2711