The different ecotypes of Brassica campestris are yellow sarson, brown sarson and toria, collectively called rapeseed. Brassica juncea is a distinct species which is called Indian mustard or rai or raya. Oil content in rapeseed ranges from 40 – 46% and mustard ranges from 33 – 40%. Rapeseed seeds are small, light brown in colour with thin seed coat while mustard seeds are bold, round, reddish brown in colour with thick seed coat.