Chemical composition has also been employed in devising taxonomic
classifications. Classifications of citrus cultivars using volatile
secondary metabolites in fruit peel oil (Boussaada et al.,
2007; Merle et al., 2004), as well as Petitgrain and Neroli oils
(Boussaada et al., 2007) have been explored. Other workers (Toyoda
et al., 1993) have examined citrus blossom volatiles using
purge and trap methods. They examined their blossom volatile
pattern data using cluster analysis (dendograms) and related
resulting classifications to morphological characteristics, such as
fruit size.