Self-Pollination

The transfer of pollen grains from the anther to a stigma on the same plant. Many annual grasses (e.g. Annual meadow grass) and agricultural crops (e.g. Oat, Barley) are self-pollinating, although the majority of perennial grasses are cross-pollinated, however, some grasses can have both pollination methods depending on prevailing conditions, such as if the stigma and anther are ‘active’ at the same time on the same plant. (See also Table 1, p.19 in, ‘Pan, K., Marshall, L., Biesmeijer, K., & R. de Snoo, G. (2022). The distributions of insect, wind and self pollination of plants in the Netherlands in relation to habitat types and 3D vegetation structure. Journal of Pollination Ecology, 31, 16–28. https://doi.org/10.26786/1920-7603(2022)684’, accessed 21 November 2022)
Annual meadow grass is also reported to be up to 15% being cross-pollinated. (https://www.cabidigitallibrary.org/doi/10.1079/cabicompendium.42485, accessed 21 November 2022). See also Cross-Pollination.