Cullen corylifolium, synonym Psoralea corylifolia,[1] (babchi) is a plant used in Indian and Chinese traditional medicine.

Corylifolium comes from similarity of the leaves to those of Corylus, a genus of tree in northern world regions, such as Sweden.

[2] Cullen corylifolium grows 50–90 cm tall and is an annual plant.

[2] Cullen corylifolium extract contains numerous phytochemicals, including flavonoids (neobavaisoflavone, isobavachalcone, bavachalcone, bavachinin, bavachin, corylin, corylifol, corylifolin and 6-prenylnaringenin), coumarins (psoralidin, psoralen, isopsoralen and angelicin), meroterpenes (bakuchiol, and 3-hydroxybakuchiol).

[3] Cullen corylifolium, or bu gu zhi 补骨脂 in traditional Chinese medicine,[4] is an herb used as a therapy for several disorders, such as treatment of lichen planus by psoralen extract combined with sunlight exposure.