Salvia forskaehlei... en masse

I came across this wonderful display on a visit to Abbotsbury Gardens, Dorset, England, recently. As much as I like the flowers of this Salvia, it is not one of my favourites, as it tends to sprawl, and re-seed everywhere. But this arrangement, either side of the steps, was quite breathtaking. There is still confusion as to the correct spelling of this Salvia. I have several books about Salvias, and have come across at least 4 different spellings.