2597 x 5494 px | 22 x 46,5 cm | 8,7 x 18,3 inches | 300dpi
Data acquisizione:
5 giugno 2015
Altre informazioni:
Ophrys apifera is an attractive orchid with several small flowers, each of which has a lip resembling a bee, and three large, pink, petal-like outer sepals; the two other inner sepals look like antennae. The whole flower thus mimics an insect feeding on a flower. In biology, the term ‘mimicry’ refers to cases where natural selection has favoured a resemblance between individuals of different species, and there are numerous examples of orchid flowers which resemble their insect pollinators. In other Ophrys species in the Mediterranean region, for example, male bees or wasps try to copulate with the lip of the flowers, which look and smell like the females of their own species. However, in Britain and generally elsewhere, the bee orchid, is self-pollinated and the pollinia, which hang on a thread, are blown against the receptive surface of the stigma. Ophrys apifera is the only species of the genus Ophrys which preferentially practices self-pollination. The flowers are almost exclusively self-pollinating in the northern ranges of the plant's distribution, but pollination by the solitary bee Eucera occurs in the Mediterranean area. In this case the plant attracts these insects by producing a scent that mimics the scent of the female bee. In addition, the lip acts as a decoy as the male bee confuses it with a female. Pollen transfer occurs during the ensuing pseudocopulation.
