Huang Jie Zi

Brassica juncea (L.) Czern. et Coss. (Brassicaceae), brown or Indian mustard, is an annual herb growing 30-150 cm tall with erect, branched stems bearing pinnately lobed lower leaves and smaller, narrower upper leaves. The plant produces racemes of small, four-petaled yellow flowers that mature into slender siliques containing round, reddish-brown to yellow seeds. Native to Central Asia and widely cultivated throughout China, India, and Europe, it tolerates a range of soils and climates. The pungent seeds (Huang Jie Zi) contain sinigrin, which hydrolyzes to release the volatile mustard oil allyl isothiocyanate, giving them their characteristic sharp, warming flavor used as condiment, oilseed, and medicine in Chinese, Ayurvedic, and Western herbal traditions.