## 2 Results  
### Identification  
CAR/PDMS fiber with optimal extraction conditions was used to study the volatile compounds emitted from the flowers of three _Tillandsa_ species. Through the use of two HS-SPME/GC-MS methods, a total of 66 compounds were identified from the floral emissions of LP-xiphi, HP-xiphi, yellow _croata_, orange _croata_, and _T. caliginosa_ (Table 2, Figure 1). Among these compounds, only seven--\(\beta\)-myrcene (6), limonene (8), eucalypt (9), \(\alpha\)-terpineol (15), geranyl acetate (18), \(\beta\)-farnesene (23), and \(\alpha\)-farnesene (24)--are present in all the species studied. The compounds were categorized into four different classes: monoterpenes, sesquiterpenenes, phenylpropanoids, and other compounds including nitrogenous compounds, esters, and fatty acid derivatives ('others' family). Qualitative differences in the profile of flower volatiles of these species were observed. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Name** & **LP-Xiphi** & **HP-Xiphi** & **Yellow _croata_ & **Orange _croata_ & _T. caliginosa_ \\ \hline Height * (mm) & 50 & 50 & 20 & 15 & 15 \\ \hline Breadth * (mm) & 20 & 20 & 5 & 5 & 5 \\ \hline Odor level & Scented & Scented & Scented & Scented & Scented \\ \hline \hline \end{tabular}  
* * = average values.  
\end{table} 
Table 1: Characteristics of the flowers of three species of the genus _Tillandsa_ used in this study. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**\#** & **Family** & **Compound** & **RT (min)** & **Yellow** & **Orange** & **Composition (\%)** & & \\  & & & _croata_ & _croata_ & _T. Caliginosa_ & **LP-Xiphi** & **HP-Xiphi** \\ \hline
1 & M & \(\alpha\)-thujene \({}^{\text{b, d}}\) & 14.15 & nd & 0.2 & nd & 0.3 & nd \\
2 & M & \(\alpha\)-pinene \({}^{\text{c, d}}\) & 14.46 & 0.3 & 0.3 & 0.3 & 0.5 & nd \\
3 & M & Sabinene \({}^{\text{c, d}}\) & 16.05 & 0.2 & 0.3 & 0.4 & 0.3 & nd \\
4 & M & \(\beta\)-phellandrene \({}^{\text{b, d}}\) & 16.23 & 0.3 & 0.5 & 0.6 & 0.5 & nd \\
5 & M & \(\beta\)-pinene \({}^{\text{c, d}}\) & 16.46 & nd & 0.2 & 0.4 & 0.3 & nd \\
**6** & **M** & \(\beta\)**-myrcene \({}^{\text{c, d}}\) & **16.78** & **0.5** & **1.2** & **1.6** & **4.7** & **6.6** \\
7 & M & \(\alpha\)-phellandrene \({}^{\text{b, d}}\) & 17.51 & nd & nd & nd & 0.7 & nd \\
**8** & **M** & **Limonene \({}^{\text{c, d}}\)** & **18.52** & **6.4** & **11.4** & **10.8** & **10.1** & **11.5** \\
**9** & **M** & **Eucalypt \({}^{\text{c, d}}\)** & **18.66** & **8.1** & **11.5** & **12.1** & **7.2** & **7.9** \\
10 & M & \(\beta\)-ocimene \({}^{\text{c, d}}\) & 18.98 & nd & nd & 0.4 & 18.8 & 9.3 \\
11 & M & \(\gamma\)-terpine \({}^{\text{c, d}}\) & 19.5 & nd & nd & 0.2 & 0.3 & nd \\
12 & M & Terpinole \({}^{\text{b, d}}\) & 20.57 & nd & nd & nd & 0.3 & nd \\
13 & M & \(\beta\)-linalool \({}^{\text{c, d}}\) & 21.02 & nd & nd & nd & 1.6 & 16.1 \\
14 & M & \(\beta\)-fenchol \({}^{\text{c, d}}\) & 23.8 & nd & nd & 0.3 & nd & nd \\
**15** & **M** & \(\alpha\)**-terpineol \({}^{\text{c, d}}\) & **24.71** & **1.2** & **1.9** & **2.1** & **0.8** & **0.9** \\
16 & M & Geraniol \({}^{\text{c, d}}\) & 26.64 & nd & 0.3 & nd & 1.2 & 1.1 \\
17 & M & Methyl geranate \({}^{\text{b, e}}\) & 29.02 & nd & nd & nd & nd & 1.9 \\ \hline \hline \end{tabular}  
\end{table} 
Table 2: Identification of volatile compounds from floral emissions of _T. xiphioides, T. croata_, and _T. caliginosa_. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline  & & & & & & & **Composition (\%)** & & \\ \# & **Family** & **Compound** & **RT (min)** & **Yellow** & **Orange** & _T.