Several investigators have attempted to employ the taxonomy of the genus Trigonella. Sirjaev (1933) has given in Latin an elaborate and systematic account of its taxonomy. Vasil’chenko (1953) has published a synopsis in Russian discussing the position of the genus within the Family Leguminosae and gave keys, synonyms and descriptions of the morphological characters of different series, their economic importance and geographical distribution. Hutchinson (1964), Heywood (1967) and Sinskaya (1961) have also given detailed descriptions of its taxonomic characters. According to these authors, the genus Trigonella contains mostly annual or perennial plants that are often strongly scented, and are described in the following terms.