Is a buckeye poisonous?

Is a buckeye poisonous?

Poisonous Plant: All parts of the plant (leaves, bark, fruit) are highly toxic if ingested – because of the glycoside aesculin, the saponin aescin, and possibly alkaloids. Symptoms are muscle weakness and paralysis, dilated pupils, vomiting, diarrhea, depression, paralysis, and stupor.