Brazil nut pollination

The bee has landed on the androecial hood of a flower of the Brazil nut tree (Bertholletia excelsa), attracted there by the yellow color (nectar guide) at the entrance into the flower. Only bees strong enough to force their way into the flower between the open end of the hood and the tightly appressed petals are efficient pollinators. The bees are seeking nectar as a reward for visiting the flower. Photo not vouchered.