Ammi majus, commonly known as bishop's flower, bishop’s weed, false bishop’s weed, bullwort, greater ammi, lady’s lace, False Queen Anne's lace or laceflower, originates in the Nile River Valley and has white lace-like flower clusters. Ammi majus fruits can be distinguished by the presence of four prominent secondary ridges and by the absence of lacunae outside the vascular bundles, as seen in the transverse section of fruit. It contains large amounts of furanocoumarin, xanthotoxin, and bergapten. The furanocoumarin in the plant can cause phytophotodermatitis and hyperpigmentation. Ammi majus is used in the treatment of vitiligo and psoriasis.
In ancient Egypt, this plant was used to treat skin diseases. Ammi majus is being studied for potential cancer and AIDS treatments.