(a) The common name of Brassica campestris Linn is mustard.
(b) The first part denotes the genus of the plant while the second part denotes the species .
(c) These names are written in italics to show their Latin origin. Moreover, it is a strict rule to write scientific name in italics.
(d) The term 'Linn' means that this species was first discovered and studied by Linnaeus.