Sturdy-branched shrub. Flower clusters symmetrical, midway between a moptop and lacecap, the sterile ray flower sepals with wavy edges. Needs strongly acidic conditions to achieve a strong blue. Raised by É. Lemoine from naturally pollinated seed of 'Mariesii' and released in 1904. Invalidly renamed 'Blue Wave' by Haworth-Booth in 1950 to avoid confusion with the parent plant. ['Blue Wave']