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Euphrasia samples used in this study. (A) Tetraploid British Euphrasia (here E. arctica) have glabrous leaves sometimes with sparse short eglandular hairs or bristles. (B) Diploid British Euphrasia have long glandular hairs. (C) Collection sites of Euphrasia DNA samples. Diploids are shown in red, tetraploids in blue. Orange boxes correspond to the three broad sampling areas. Photo credits: Alex Twyford, Max Brown.
