As I search about it in Wikipedia, this is what it is exactly called.
Primula veris (Cowslip; syn. Primula officinalis Hill) is a flowering plant in the genus Primula. The species is native throughout most of temperate Europe and Asia, and although absent from more northerly areas including much of northwest Scotland, it reappears in northernmost Sutherland and Orkney.
photo of the Schlüsselblumen which I took today with my Sony model DSC-W110