Flat blooming, overlap petalled pin. White flowers with pale pink suffused reverse. The cultivar name derives from the river in Saitama, central Japan.
Wave blooming, overlap petalled thrum. Blue shaded white flowers with dark blue reverse. Tends to be lower growing with tight flower heads. Raised by Julian Sutton in Devon and named after the Dartmoor river. A very attractive, semi-compact Primula sieboldii cultivar.