Beyond P:O ratios: evolutionary consequences of pollinator dependence and pollination efficiency for pollen and ovule production in angiosperms.

Our findings demonstrate that pollinator dependence and pollination efficiency commonly influence the evolution of pollen number per flower but have more limited effects on ovule number. P:O ratios provide ambiguous, possibly misleading, information about mating systems, especially when compared among clades. This article is protected by copyright. All rights reserved.