Adzuki bean var。 Microsperma) is a leguminous tree with pinnate compound leaves, long elliptic leaflets and panicles, white flowers, flat pods, bright red seeds, dark brown heartwood, hard texture and corrosion resistance, which can be used as columns, ships, building materials and box boards; The seeds are bright red and beautiful, and can be used as decorations.

Yunnan, Guizhou, Guangxi, Guangdong, Fujian and Taiwan Province provinces. Mostly in canyons, streams, forests or cultivated in gardens. Myanmar, Cambodia, Laos, Vietnam, Malaysia and Indonesia are also distributed. Red beans can be made into various delicious foods with high nutritional value. It is often used to symbolize acacia in ancient literature.