Comparison of fruit set in six populations of Linaria cavanillesii after different treatments: control bag (inflorescences were bagged at bud stage, anthers were removed prior to anthesis, and flowers were left unmanipulated); control (inflorescences were left unmanipulated); emasculation (emasc; anthers were removed prior to anthesis and the flowers were left unmanipulated) and supplementary outcross pollen (pollen_out; anthers were removed prior to anthesis, and, when mature, outcross pollen was applied to stigmas from at least two donor plants from the same population). SC, self-compatible population; SI, self-incompatible population; SC_SI, mixed population containing both types of plant. Bars represent mean ± s.e.m. and the number of plants used for each treatment is indicated.