## 3 Results and Discussion
### Minerals  
The mineral composition found in _Oxalis pes-caprae_ is shown in Table 3, with potassium and Fe predominating among the macro- and micro-nutrients, respectively.  
Calcium (Ca) concentration was higher in the stems (620 mg/100 g), and is six times lower in the flowers (104 mg/100 g). A study conducted by [PERSON], [PERSON], [PERSON], and [PERSON] [29] on six WEPs showed Ca contents ranging from 492 to 621 mg/100 g; this range is very close to that found in _Oxalis_ leaves and stems. Regarding potassium (P), stems (1399 mg/100 g) and flowers (1247 mg/100 g) showed similar contents and were significantly higher than leaves. K content found here was higher than those reported in _Enhydra fluctuans_ (487 mg/100 g) but much lower than those reported in other 19 WEPs, reaching a value as high as 7830 mg/100 g in _Smyrnium cordiifolium_ [PERSON] [45]. Regarding sodium (Na), there were no differences between the contents of leaves and stems, but they were higher than the Na content in the flowers. _Cichorium intybus_ L. showed a higher sodium concentration (80.61 mg/100 g) in a study carried out by [PERSON] and [PERSON] [45]. The _Oxalis_ flowers had similar Na contents to those of other types of plants, such as _Allium hirtifolium_ [PERSON], _Stachys lavandulfidia_ [PERSON], or _Taraxacum vulgar_ [PERSON]. [PERSON]. (30.28, 30.26, 30.35 mg/100 g, respectively) [45]. The content of magnesium (Mg) followed the order  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multicolumn{2}{c}{**Mineral [mg (100 g)\({}^{-1}\) dw]**} & \multicolumn{1}{c}{**Flowers**} & \multicolumn{1}{c}{**Leaves**} & \multicolumn{1}{c}{**Stems**} & \multicolumn{1}{c}{**\(p\)-Value**} & \multicolumn{1}{c}{**ANOVA**\({}^{\dagger}\)} \\ \hline \multirow{4}{*}{Macro} & Ca & 104 \(\pm\) 16.97 c \({}^{\ddagger}\) & 620 \(\pm\) 20.21 b & 453 \(\pm\) 10.60 a & 0.0000 & *** \\  & K & 1247 \(\pm\) 3.53 b & 859 \(\pm\) 20.56 c & 1399 \(\pm\) 21.21 a & 0.0000 & *** \\  & Na & 35.1 \(\pm\) 12.47 b & 69.1 \(\pm\) 1.20 a & 71.5 \(\pm\) 3.88 a & 0.0000 & *** \\  & Mg & 95.4 \(\pm\) 2.47 b & 129 \(\pm\) 2.80 a & 73.2 \(\pm\) 0.00 c & 0.0000 & *** \\ \hline \multirow{4}{*}{Micro} & Fe & 7.7 \(\pm\) 0.28 a & 3.2 \(\pm\) 0.16 b & 1.4 \(\pm\) 0.03 c & 0.0000 & *** \\  & Mn & 0.87 \(\pm\) 0.00 b & 1.18 \(\pm\) 0.01 a & 0.32 \(\pm\) 0.00 c & 0.0000 & *** \\ \cline{1-1}  & Zn & 0.30 & n.d. & n.d. & - & - \\ \hline \hline \end{tabular} \({}^{\dagger}\) *** significant at \(p<0.001\). \({}^{\ddagger}\) Values (mean of 3 replications) followed by the same letter within the same row were not significantly different (\(p>0.05\)) according to [PERSON]’s least significant difference test. n.d.: not detected.  
\end{table}
Table 3: Mineral composition of _Oxalis_ Pes-caprae_ L.  
leaves \(>\) flowers \(>\) stems, with these contents being similar to those previously found in _Anchusa italica_ [PERSON] (120 mg/100 g) [45].  
The most abundant micro-nutrient was Fe, especially in the flowers. No biologically significant differences were observed in the contents of Mn and Zn. The experimental contents of these three nutrients are similar to those previously reported in other WEPs [45].