NIGELLA, FENNEL-FLOWER, or Devil in a Bush: A genus of the pentagynia order, belonging to the pentandra class of plants. There is no calyx; the petals are five; and five trifid nectaria within the corolla; there are five connected capsules. There are five species, all of them natives of the warm parts of Europe, and rising from a foot to a foot and an half high, adorned with blue or yellow flowers. They are propagated by seeds, which in a dry and warm situation will thrive very well; and the plants ripen seeds in this country.