“…A total of 72 R. officinalis essential oil compositions from the published literature [17,18,19,20,28,29,30,31,32,33,34,35,36,37,39,41,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81] in addition to the six samples from this study were treated as operational taxonomic units (OTUs). The percentage composition of 23 major essential oil components (1,8-cineole, α-pinene, camphor, verbenone, borneol, camphene, myrcene, bornyl acetate, β-pinene, limonene, α-terpineol, linalool, β-caryophyllene, p -cymene, terpinen-4-ol, γ-terpinene, geraniol, α-phellandrene, terpinolene, α-terpinene, α-humulene, sabinene, and caryophyllene oxide) was used to determine the chemical relationship between the various R. officinalis essential oil samples by agglomerative hierarchical cluster (AHC) analysis using the XLSTAT software, version 2015.4.01 (Addinsoft™, New York, NY, USA).…”