noun
butterfly pea; Asian pigeonwings
A tropical leguminous plant (Clitoria ternatea) with distinctive blue flowers, often used for tea and natural coloring.
チョウマメの花から青いお茶が作られる。
Blue tea is made from the flowers of the butterfly pea.
The Japanese name チョウマメ literally means 'butterfly bean', referring to the flower's resemblance to a butterfly. The exact historical derivation is uncertain.