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The genus Nigella, burdened with about 80 or more binomials, consists of only 14 acceptable species. A key, notes on the nomenclature, and illustrations are provided. The most polymorphic species is N. arvensis; its races have long been subject to taxonomical controversy and are grouped here into 14 varieties: N. arvensis var. anatolica, var. iranica, and var. simplicifolia are described as new taxa.