Spatial separation of stamen and stigma (herkogamy) is an effective way for angiosperm species to reduce sexual interference and prevent self-pollination. It can however also reduce the possibility of pollinators...
Tag - sexual interference
William Salter
In the right place at the right time for pollination
Parnassia epunctulata, a herb with generalized pollination, which exhibits sequential stamen movement.
AJ Cann