## 3 Results and Discussion
### Essential Oil Composition
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline  & & \multicolumn{2}{c}{**KEM**} & \multicolumn{2}{c}{**DEF**} & \multicolumn{2}{c}{**SIR**} \\ \hline
**RI** & **Compound** & **Mean** & **SD** & **Max** & **Mean** & **SD** & **Max** & **Mean** & **SD** & **Max** \\ \hline \multicolumn{8}{c}{**Sesquiterpene Hydrocarbons**} \\ \hline
1354 & \(\alpha\)-Cubebene & 0.2 & _0.2_ & _0.5_ & 0.1 & _0.1_ & _0.5_ & 0.1 & _0.1_ & _0.3_ \\
1380 & \(\alpha\)-Copaene & 0.2 & _<0.05_ & _0.2_ & 0.1 & _<0.05_ & _0.2_ & 0.1 & _<0.05_ & _0.2_ \\
1391 & \(\beta\)-Bourbonene & \textless{}0.05 & _<0.05_ & _<0.05_ & _<0.05_ & _<0.05_ & _0.1_ & \textless{}0.05 & _<0.05_ & _0.1_ \\
1394 & \(\beta\)-Cubebene & 0.2 & _0.1_ & _0.4_ & <0.05 & _0.1_ & _0.2_ & 0.1 & _0.1_ & _0.2_ \\
1425 & \(\beta\)-Caryophyllene & 0.9 & _0.5_ & _2.3_ & 1.0 & _0.4_ & 1.5 & 1.0 & _0.4_ & _1.6_ \\
1446 & Aromadendrene & 0.2 & _0.1_ & _0.4_ & 0.2 & _0.1_ & _0.4_ & 0.2 & _0.1_ & _0.4_ \\
1460 & \(\alpha\)-Humulene & 0.7 & _0.5_ & _1.2_ & 0.8 & _0.4_ & _1.5_ & 0.9 & _0.5_ & _1.7_ \\
1470 & _epi_-Bicyclo- & & & & & & & & & \\ sesquiphellandrene & & & & & & & & & & \\
1483 & \(\gamma\)-Muurolene * & 0.9 b & _0.3_ & _1.4_ & 0.3 a & _0.4_ & _1.1_ & 0.5 ab & _0.2_ & _0.8_ \\
1488 & Germacrene D * & 7.4 b & _2.2_ & _10.4_ & 4.5 a & _2.7_ & _9.9_ & 4.3 a & _2.3_ & _7.4_ \\
1502 & Bicyclogermacrene & 1.8 & _0.6_ & _2.7_ & 1.5 & _0.3_ & _2.1_ & 1.3 & _0.4_ & _1.8_ \\
1505 & \(\alpha\)-Muurolene * & 0.7 b & _0.2_ & 1.2 & 0.6 ab & _0.1_ & _0.6_ & 0.5 a & _0.1_ & _0.7_ \\
1513 & \(\beta\)-Bisabolene & 0.3 & 0.3 & 0.9 & 0.6 & _0.2_ & _1.0_ & 0.7 & _0.3_ & _1.2_ \\
1520 & \(\gamma\)-Cadinene * & 1.4 a & 0.3 & 1.7 & 1.2 ab & _0.2_ & 1.5 & 1.0 b & _0.3_ & _1.4_ \\
1530 & \(\delta\)-Cadinene & 2.8 & _0.5_ & _3.7_ & 2.2 & _0.3_ & _2.7_ & _2.1_ & _0.6_ & _2.8_ \\
1539 & _trans_-Cadina-1,4-diene & 0.1 & _<0.05_ & _0.2_ & 0.1 & _<0.05_ & _0.1_ & 0.1 & _<0.05_ & _0.1_ \\
1545 & \(\alpha\)-Cadinene & 0.2 & _0.1_ & _0.3_ & 0.2 & _<0.05_ & _0.2_ & 0.1 & _<0.05_ & _0.2_ \\
1548 & _cis_-\(\alpha\)-Bisabolene & 0.1 & _0.1_ & _0.2_ & _<0.05_ & _0.1_ & _0.2_ & 0.1 & _0.1_ & _0.3_ \\  & Sum & 18.3 & & & 13.6 & & & 13.4 & & & \\ \hline \multicolumn{8}{c}{**Ovidised Sesquitergenes**} \\ \hline
1583 & Germacrene D-4-ol & 0.4 & _0.2_ & _0.8_ & 0.4 & _0.2_ & _0.9_ & 0.2 & _0.1_ & _0.3_ \\
1585 & Spathulenol & 0.1 & _0.1_ & _0.3_ & 0.1 & _0.1_ & _0.2_ & <0.05 & _0.1_ & _0.2_ \\
1591 & Caryophyllene oxide & 0.2 & _0.1_ & _0.4_ & 0.2 & _0.1_ & _0.3_ & 0.1 & _0.1_ & _0.2_ \\
1650 & \(\tau\)-Cadinol * & 0.4 b & _0.2_ & _0.7_ & 0.4 ab & _0.1_ & _0.6_ & 0.2 a & _0.1_ & _0.3_ \\
1663 & \(\alpha\)-Cadinol & 0.3 & _0.1_ & _0.6_ & 0.2 & _0.1_ & _0.3_ & 0.2 & _0.1_ & _0.3_ \\
1692 & \(\alpha\)-Bisabololol & 0.1 & _0.1_ & _0.3_ & 0.1 & _<0.05_ & _0.2_ & 0.1 & _0.1_ & _0.3_ \\  & Sum & 1.4 & & & 1.3 & & & 0.9 & & \\
**Other** & & & & & & & & & & \\
1199 & Estragol & 0.2 & _0.2_ & _0.5_ & 0.1 & _0.1_ & _0.2_ & 0.2 & _0.1_ & _0.3_ \\  & Total Sum & 98.0 & & & & & & & & & \\ \hline \multicolumn{8}{c}{* For these compounds means followed by the same letter are not significantly different according to a one-way ANOVA with Tukey post hoc test: ** also contains some limonene; SD: standard deviation (\(n=10\)).} \\ \end{tabular}
\end{table} 
Table 1: _Cont._To get further insight into the variability, a principal component analysis was calculated with 30 essential oil compounds as variables and the samples as cases, and resulted in eight components with an Eigenvalue greater than one, accounting for 86.7% of the variability. The loadings of the compounds on the first two components, representing together 48.2% of the variability, are displayed in Figure 1. \(\beta\)-Phellandrene and \(\beta\)-pinene, as well as myrcene, had a high positive component 1 loading, while \(\alpha\)-pinene and germacrene D showed negative loadings on this component. All oxidized monoterpenes as minor essential oil constituents loaded positively on both components.