Imbralyx leucanthus

Millettia leucantha or sathon is a species of plant in the legume family, Fabaceae. It is a perennial flowering tree native to Indo-China – Cambodia, Laos, Myanmar, Thailand, and Vietnam – as well as Bangladesh and southern Yunnan province in China.
It is the provincial tree and flower of Khorat or Nakhon Ratchasima Province in Isaan, where it is known as sathon.

Varieties

Two varieties are recognized:Imbralyx leucanthus var. buteoides – Cambodia, Laos, Thailand, and VietnamImbralyx leucanthus var. leucanthus – Bangladesh, Myanmar, Thailand, and southern Yunnan

Uses

Sathon sauce is a flavouring sauce used in Isaan cuisine. The leaves of two species of Millettia are used for making sathon sauce: Millettia utilis and Millettia leucantha var. buteoides. This sauce used for cooking is the only OTOP product made from the sathon tree.