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In the extreme north, Papaver radicatum s.1. occurs in a yellow and in a white-flowered type. The more severe the weather conditions the higher the frequency of the white phenotype. The colouring agents in the petals are all flavonol glucosides; in the yellow flowers gossypitrin (1) and herbacitrin (2), in the white ones the kaempferol glucoside astragalin (3). Only astragalin shows UV reflection,...
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