(a) Common name of the plant is mustard.
(b) Brassica is the generic name and campestris is the specific name or specific epithet.
(c) Both the words in a scientific name when printed they must be in italics. This is done to highlight their origin from Latin.
(d) At the end of the biological name i.e., after the specific epithet name of the author is written in an abbreviated form. Here linn, indicates that this species was first described by Linnaeus.