In several locations
Last picture compared with L. hyssopifolia
https://flora-on.pt/#/1lythrum+tribracteatum
https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:553824-1
https://ucjeps.berkeley.edu/images/illustrations/fp-879-8.png
during field outing with the Sociedade Portuguesa de Botânica guided by @jaelpalhas and @joaofarminhao
Plant kown to @jaelpalhas
Odour nothing like fennel, lemony
https://flora-on.pt/?q=Foeniculum+sanguineum