“…Essential oils (EO) are specific to varieties and taxonomic groups and are often used in comparative studies to assess the genetic diversity of a species, quantify the relationships between varieties or species, and classify unknown varieties on the basis of discriminating compounds, e.g. in mandarin (Lota et al, 2000(Lota et al, , 2001Fanciullino et al, 2006;Liu et al, 2013aLiu et al, , 2013b, kumquat (Güney et al, 2015;Sutour et al, 2016), grapefruit and citron (Luro et al, 2012). In addition, EO is the aromatic base that characterizes varieties and their processed by-products.…”