Brassica rapa L.
Binomial Name : Brassica rapa L.
Synonym : Brassica campestris L.
Family : Brassicaceae
Common Name : Field mustard
Annual herb; root tuberous or fusiform; stem erect, stout, simple of branched, 30-100 cm high; leaves alternate, petioled, large, more or less pinnatifid; raceme or corymb; flowers yellow, pedicellate, tetramerous; siliquas 3.7-7.5 cm, glabrous; seeds small, pale or dark, smooth.