ChristianAnswers.Net WebBible Encyclopedia
a plant of the genus sinapis, a pod-bearing, shrub-like plant, growing wild, and also cultivated in gardens
The little round seeds were an emblem of any small insignificant object. It is not mentioned in the Old Testament; and in each of the three instances of its occurrence in the New Testament (Matt. 13:31-32; Mark 4:31-32; Luke 13:18-19) it is spoken of only with reference to the smallness of its seed.