Hi Zuzu,
Uhhg!
I've seen it offered as Leonotis ocymifolia var. ocymifolia and that's the closest match that I've found so far. However, some sources still show conflicting forms so I wouldn't swear to it.
This genus is so muddled in the industry that it's difficult to find clear answers. I do know that the plant sold as "Leonotis menthifolia" is distinctly different in leaf shape, flower, and form/stature than Leonotis nepetifolia and Leonotis leonorus.
I think we need someone with a plant in one hand and a good taxonomic key in the other!