The so called mustard (read sarson saag) sold in the market may belong to any of atleast the four species: auricled leaved medium sized (ca 2 mm) seeds, some what thicker leaves, about 1cm long petals species with either bluish-green glaucous leaved and pale yellow flowered B. napus or green leaved and bright yellow B. rapa (formerly B. campestris, the sarson), or green thinner leaves without auricles, 1 mm seeds, and 5-6 mm long petals species B. juncea (pod about 3-5 cm, divaricate) or B. nigra (pod 2-3 cm, ascending). Plus there could also be some leafy variety of B. oleracea.
Let us upload photographs with shots of some upper leaves to show leaf base, tip of inflorescence, flower and possibly a mature fruit.
Dr. Gurcharan Singh
SGTB Khalsa College, University of Delhi, Delhi-110007
Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018.
Phone: 011-25518297 Mob: 9810359089http://people.du.ac.in/~singhg45/