At one time Chris Rose of the UK had an extensive hybridizing program involving creative blends of many species. Unfortunately, most of these are no longer in cultivation, but it’s worthwhile seeing some of his results.
This plant is a hybrid of S. formosus and S. ‘Elsi’, and produces the large shapely flowers with a dark-flecked yellow throat characteristic of formosus, with the darkish lavender a result of the influence of ‘Elsi’. Like most formosus hybrids, the flower count is relatively low (per stalk), but the leaves are sturdy and a well-grown plant will produce many stalks per leaf. A sibling plant may be seen by clicking here.