Mustard is an annual herb cultivated as oil seed crop or as vegetable or as fodder, of which, 3 species are known for its condiment value. They are pale yellow or white mustard (Brassica hirta), brown mustard (Brassica juncea) and black mustard (Brassica nigra). The leaves of the plant are alternate, long, bristly branched, petiolate, hairy on both sides. Flowers are small, yellow with 4petals, cruciform. Seeds are 1.5-3mm. 
 
Indian name for Mustard:
Hindi : Rai, Banarasi rai, Kalee sarson Gujarati : Rai Kannada : Sasave Kashmiri : Aasur, Sorisa Malayalam : Kaduku Punjabi : Rai, Banarasi rai, Kalee sarson Sanskrit : Asuri, Bimbata Tamil : Kadugo Telugu : Avalu Urdu : Rai, Banarasi rai, Kalee sarson
Foreign name for Mustard:
Spanish : Mostaza French : Moutarde German : Senfsaat Swedish : Senap Arabic : Khardal Dutch : Mosterd Italian : Senape Portuguese : Mostarda Russian : Gorchitsa Japanese : Shiro Karashi Chinese : Chieh