The reproductive success in flowering plants, measured as seed set, may depend on a number of factors, including pollen limitation, resource limitation, predation, and physical environment. Resource limitation is probably the most important factor in flowering plants as a whole. But in alpine species dependent on insects for pollination, pollen limitation may be more important, since pollinators generally are less reliable. In this study, we studied the pollination ecology of Gentiana straminea, an alpine p...