Received27April1982INDEX WORDS Rosa, rose genetics, flower pigments, paper chromatography, anthocyanin, cyanin, peonin, pelargonin. SUMMARYIn breeding for color and winter hardiness in Rosa, more than 1200 progeny from 47 families were analyzed for anthocyanin pigments. Cyanin, peonin and pelargonin were found in 99x, 52% and 31% respectively, of the seedlings. Each pigment was highly heritable from seed or pollen parents or both. All showed quantitative inheritance, particularly cyanin and peonin. A system is proposed to explain most of the synthetic pathways and controls for anthocyanin production in roses.

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The breeding program at the Morden Research Station is designed to develop hardy, attractive roses for Canadian prairie conditions. Cultivars developed from this program are known collectively as the Parkland Rose Series of which there have been eight previous introductions (Marshall, 1977). 'Morden Fireglow' is the newest cultivar and Received for publication 20 Feb. 1990. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.

Blush is a hardy, dwarf everblooming rose cultivar with light pink to ivory flowers borne in small clusters.