The common bean (Phaseolus vulgaris) is a plant in the family Fabaceae. It is native to the Americas, where it was domesticated by ancient cultures of south and Central America, but it is now grown as a vegetable throughout the world. It comes in many species, which can be distinguished between the bush varieties and the running varieties, which form vines that need to climb on poles.
A flower can give rise to one pod, which can be eaten in green beans. Raw bean seeds are toxic and should be soaked in water for some time and then boiled about fifteen minutes before they are eaten. Poisoning by the lectin contained in beans could cause nausea, vomiting, and diarrhea.