ABC model of flower development well as in the determination of the floral meristem. Therefore, the "AG" mutants are devoid of androecium and gynoecium and they have petals and sepals in their place. In addition, the growth in the centre of the flower is undifferentiated, therefore the petals and sepals grow in repetitive verticils. The "PLENA" ("PLE") gene is present in "A. majus", in place of the "AG" gene, although it is not an ortholog. However, the "FARINELLI" ("FAR") gene is an ortholog, which is specific to the development of the anthers and the maturation of pollen. In "Petunia", "Antirrhinum" and in maize the C
Minuartia groenlandica it does flower anywhere between June to August. In this period pollen grains are transported from flower to flower by insects. The most effective insect to transport pollen grains is the bumblebee "Bombus terricola". This is due to tiny hairs on the bee that collect pollen, and the bee's habit of crawling all over the flower in low temperatures when it is too cold to fly. Greenland stitchwort is found in areas of high elevation where bedrock is exposed. The plant grows on rocky ledges and in fine gravel on slopes. The soil in this area has a pH of