Among the following names belong to various taxa  related to wheat, which has to be written in italics?

According to rules of nomenclature given by ICBN, only binomials have to be written in italics but not the family, order, class and division names. Monocotyledonae is a class, Poales is an order, Poaceae is a family and Triticum is generic name. Hence Triticum must be written in italics as Triticum. Species of genus Triticum known as vulgare should also be written in italics as vulgare.