Pollination of Brachystele unilateralis. Bombus terrestris and B. ruderatus bees repeatedly probe flowers from a single inflorescence, remove pollinaria and pollinate them promoting geitonogamy.
Music taken from Youtube's Audiolibrary. Well-Tempered Clavier 2, Prelude & Fugue No. 6 (BWV 875): Prelude; Author: Johann Sebastian Bach; Interpreters: Florindo Baldissera & Vittorino Nalato.
