Khurasani Ajwain (Hyoscyamus niger Linn.), or Black Henbane, is a biennial herb from the Solanaceae family. It has oval leaves and yellow-green flowers with purple veins, producing small seeds. Native to temperate areas of Asia, Europe, and North Africa, the plant contains alkaloids like hyoscyamine, atropine, and scopolamine. Seeds and dried leaves are used in herbal blends and cultural practices for their distinct aroma.