## 3 Results and Discussion
In point B, the other relevant volatile compound was \(\beta\)-caryophyllene, whereas in point A, there was \(\beta\)-myrcence, \(\alpha\)-pinene, \(\alpha\)-terpineol, trans-\(p\)-menth-2-en-7-ol, and \(\gamma\)-muurolene (Figures 3B and 4B). The same points in the dendrogram cluster were also obtained for the deep pink morphotype. However, in this case, the discrepancies among B, C, and D were less relevant. \(\beta\)-Pinene was the metabolite with the highest level, except for A, where \(\alpha\)-pinene and \(\gamma\)-muurolene were the major volatile components. The main cluster of this morphotype involved 1,8-cineole, \(\gamma\)-cadinene, and \(\beta\)-caryophyllene (Figures 3C and 4C). \begin{table}
\begin{tabular}{c c c c c c} \hline
**No.** & **COMPONENT 1** & **LRI 2** & **LRI 3** & **White** & **Pink** & **Deep Pink** \\ \hline
2 & \(\alpha\)-thujene & 921 & 923 & 0.6 \(\pm\) 0.02 & 5.6 \(\pm\) 0.04 & 2.3 \(\pm\) 0.02 \\
3 & \(\alpha\)-pinene & 940 & 945 & 1.4 \(\pm\) 0.03 & - & - \\
4 & camphene & 950 & 948 & 5.2 \(\pm\) 0.03 & 6.2 \(\pm\) 0.03 & - \\
5 & sabinene & 964 & 966 & 5.1 \(\pm\) 0.04 & 3.3 \(\pm\) 0.02 & 3.2 \(\pm\) 0.02 \\
7 & \(\beta\)-pinene & 982 & 986 & 32.4 \(\pm\) 0.32 & 19.5 \(\pm\) 0.23 & 32.2 \(\pm\) 0.16 \\
8 & \(p\)-cymene & 1020 & 1016 & 1.2 \(\pm\) 0.02 & - & 0.9 \(\pm\) 0.03 \\
9 & 1,8-cineole & 1026 & 1025 & 12.9 \(\pm\) 0.15 & 12.2 \(\pm\) 0.18 & 14.7 \(\pm\) 0.11 \\
10 & cis-\(\beta\)-ccinene & 1041 & 1037 & 0.9 \(\pm\) 0.02 & 1.0 \(\pm\) 0.01 & 2.7 \(\pm\) 0.02 \\
11 & trans-\(\beta\)-ccinene & 1044 & 1043 & 5.4 \(\pm\) 0.04 & 4.6 \(\pm\) 0.07 & - \\
12 & \(\gamma\)-terpinene & 1051 & 1054 & 2.0 \(\pm\) 0.02 & 0.5 \(\pm\) 0.02 & - \\
13 & linalool & 1083 & 1082 & 0.8 \(\pm\) 0.02 & 1.7 \(\pm\) 0.03 & - \\
14 & trans-sabinene hydrate & 1105 & * & 0.5 \(\pm\) 0.01 & - & - \\
15 & camphor & 1128 & 1125 & 6.1 \(\pm\) 0.06 & 11.4 \(\pm\) 0.14 & - \\
16 & bornel & 1156 & 1154 & - & 2.6 \(\pm\) 0.04 & - \\
17 & \(\alpha\)-terpineol & 1186 & 1183 & - & - & 0.5 \(\pm\) 0.02 \\
18 & bornyl acetate & 1282 & 1278 & 1.5 \(\pm\) 0.02 & 1.3 \(\pm\) 0.02 & - \\
19 & \(\alpha\)-cubebene & 1355 & 1350 & - & - & 0.2 \(\pm\) 0.01 \\
20 & \(\beta\)-caryophyllene & 1426 & 1424 & 7.8 \(\pm\) 0.07 & 5.8 \(\pm\) 0.03 & 5.9 \(\pm\) 0.03 \\
21 & cis-muurola-3,5-diene & 1444 & 1447 & - & 1.2 \(\pm\) 0.01 & 0.5 \(\pm\) 0.02 \\
22 & cis-muurola-4(14), 5-diene & 1463 & 1460 & 0.6 \(\pm\) 0.01 & 1.0 \(\pm\) 0.02 & - \\
23 & humulene & 1475 & 1473 & 0.6 \(\pm\) 0.02 & - & - \\
25 & \(\alpha\)-farmesene & 1482 & 1484 & 0.9 \(\pm\) 0.02 & - & - \\
24 & germacrene D & 1488 & 1489 & 0.8 \(\pm\) 0.03 & - & 0.5 \(\pm\) 0.02 \\
26 & \(\gamma\)-muurolene & 1490.5 & 1494 & - & - & 2.7 \(\pm\) 0.04 \\
27 & \(\gamma\)-cadinene & 1517 & 1514 & 12.1 \(\pm\) 0.11 & 18.0 \(\pm\) 0.11 & 27.9 \(\pm\) 0.31 \\
28 & \(\delta\)-cadinene & 1530 & * & 1.2 \(\pm\) 0.02 & 3.1 \(\pm\) 0.03 & 4.2 \(\pm\) 0.04 \\
29 & germacrene B & 1585 & 1582 & - & - & 1.2 \(\pm\) 0.02 \\  & SUM & & 100.0 & 99.0 & 99.6 \\  & Monoterpenoids & & 76.0 & 69.9 & 56.5 \\  & Sesquiterpenoids & & 24.0 & 29.1 & 43.1 \\ \hline \end{tabular}  
* The components are reported according to their elution order on an apolar column; 2 Linear retention indices measured on an apolar column; 3 Linear retention indices from the literature;
* Not detected.  
\end{table} 
Table 3: Chemical volatile composition (percentage mean value \(\pm\) standard deviation of the three morphotypes (white, pink, deep pink) of _A. millefolium_ collected in point C.  
Overall, to our knowledge, this was the first study reporting the volatile chemical composition of the flowering aerial parts of different _A. millefolium_ performed on fresh untreated samples via the SPME-GC-MS techniques. Only two previous works have applied the SPME procedure for the screening of the volatile composition of _A. millefolium_ on different matrices. [PERSON] and co-authors [12] investigated the chemical profile of the dried leaves, flower buds, and flowers of _A.