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A male flower on a plant from a dioecious population of broadleaf arrowhead (Sagittaria latifolia). Males in dioecious populations and the male sex role of hermaphrodites in monoecious populations of S. latifolia are subject to strong sexual selection. Photo credit: Marcel Dorken. See the article ‘Sexual selection on male but not female function in monoecious and dioecious populations of broadleaf arrowhead (Sagittaria latifolia)’, by Kwok A, Dorken ME, published in Proc. R. Soc. B (https://dx.doi.org/10.1098/rspb.2022.0919).