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The biodiversity in South Africa provides more than 30 000 higher plants, of which more than 3000 are used by traditional healers to treat diseases. Typha capensis (bulrush) is one of the medicinal plants used in South Africa to treat male fertility problems. Considering that South African traditional healers have been recognised by Law and the health benefits of T. capensis have not been scientifically investigated yet, this study aimed at investigating the in vitro effects of aqueous extracts from this plant on male reproductive functions. Both leaves and rhizomes of T. capensis were dried, infused with distilled water and freeze–dried. Motile sperm from 50 men were isolated by swim‐up and incubated with 1 μg ml⁻¹ aqueous extract of Typha rhizome for 1 h at 37 °C. Vitality, motility, sperm production of reactive oxygen species and mitochondrial membrane potential were analysed in the test sample, a control and …