Plant-robber-pollinator interactions are studied in an alpine plant, Salvia przewalskii, that is pollinated by long-tongued Bombus religiosus and short-tongued B. friseanus, and robbed by B. friseanus. Ye et al. find...
Plants surrounded by individuals of other co-flowering species may attract more pollinators but can suffer a reproductive cost from interspecific pollen transfer. Yang et al. compare pollination and reproduction in...