nhyacinth beanperennial twining vine of Old World tropics having trifoliate leaves and racemes of fragrant purple pea-like flowers followed by maroon pods of edible seeds; grown as an ornamental and as a vegetable on the Indian subcontinent; sometimes placed in genus Dolichos
Webster's Revised Unabridged Dictionary
Hyacinth bean(Bot) a climbing leguminous plant (Dolichos Lablab), related to the true bean. It has dark purple flowers and fruit.
Hyacinth bean vine flowers may be purple or white.