not thread-like)  leaves . The  flowers  are delicate, and usually coloured pale blue and white, with 5–10 petals. The  fruit  is a large and inflated capsule  composed of 3–7 united follicles, each containing numerous  seeds . The seed is used as a  spice . http://upload.wikimedia.org/wikipedia/commons/thumb/6/6a/Nigella_Sativa_Seed.jpg/220px-Nigella_Sativa_Seed.jpg In  English ,  Nigella sativa  seed