Styphnolobium japonicum

Styphnolobium japonicum (L.) Schott is a dye plant.

Colors
It yields a yellow colour.

The tree contains five main flavonoids: rutin, quercetin, isorhamnetin, genistein and kaempferol. .

Parts used
Colorants are extracted from the flowers, and it's preferred to get the buds before they open. Han (2015) remarks rutin and quercetin content is higher in pagoda buds than in pagoda flowers.

Synonyms
Sophora japonica L.

In japanese the colour made by this plant is called enju. In some chinese books describing dye recipes this plant appears as 槐花 [huai hua], 槐米 [huai mi], 槐花米 [huai hua mi] or 槐子 [huai zi].