haricot bean vs string bean

A herbaceous plant from the Americas, Phaseolus vulgaris, the bean of which is eaten as both a green bean and dried, when it is cooked slowly as Boston baked beans 

A common bean (Phaseolus vulgaris) 

A hyacinth bean (Lablab purpureus) 

Any long, slender green bean. 

A tall and thin person. 

An immature runner bean (Phaseolus coccineus) 

A yardlong bean (Vigna unguiculata subsp. sesquipedalis)