Xiyangcai also known as Bean Cress, alias also known as East Ocean Grass, Xiyangcai, paddy mustard, gazania, resistant lettuce, water mustard, water nasturtium and so on.

It is a perennial aquatic herb in the genus Brassica juncea, 20-40 centimeters high, all smooth and glabrous, simple pinnately compound leaves, 3-9 leaflets, broadly ovate, oblong or suborbicular, petiolules fine and flat, petiole base auricular, slightly embracing the stem, racemes terminal, flowers, sepals long ovate, petals white, obovate or broadly is-shaped, the fruit stalk slender and flat, the style of the flower is auricular, slightly embracing the stem, raceme terminal, flowers, sepals long ovate, petals white, obovate or wide is-shaped. Fruiting stalks slender, short styles, flowering in April-May, fruiting in June-July.