Three images of Aesculus californica; California Buckeye, Sapindaceae, Soapberry Family, formerly Hippocastanaceae, Horsechestnut Family. The bark and fruit (seeds) of this California native tree were used by native groups for various purposes. The bark (leached of toxins) was applied to treat toothache and loose teeth. Crushed seed tossed into a pool of water to stun fish. All parts are considered toxic.