C. x hiemalis. The name means "Glory of Showa Era" in Japanese. This cultivar was named after Japanese Emperor Hirohito, whose reign got the title "Showa", "the era of enlightened peace". According to Ishii's Engei Daijiten (1950), Showa-no-Sakae was introduced by Jisuke Minagawa in Saitama in 1937 from a seedling originated in Kansai area (?).