Hyacinth Bean has been grown in Asia for centuries, and is a familiar ornamental here in the U.S., vigorous and reliable. A true heirloom.
However, WHITE Hyacinth Bean is not so common. Long stems of snowy, fragrant blossoms pop against broad heart-shaped leaves and last for days Hummingbirds and butterflies love them. Profuse and fast-growing, it will cover a fence in a summer, and is an excellent nitrogen fixer. If you care to eat them, the beans must be cooked first.
White lablab is rare. It's an annual in most zones. Save seeds to plant next season.