A one-page review from the Botanical Gazette's Current Literature section summarizing Tine Tammes's genetic study of flower characters in six varieties of common flax (Linum usitatissimum). It explains how complementary factors B and C produce blue flowers, with factor A intensifying the color, and how these factors affect anther color, seed color, petal shape, vein pigmentation, and seed number and viability. It is plant genetics rather than textile technique, relevant to flax as a fiber crop.