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Citronella currently redirects to lemongrass, but citronella is also a completely unrelated plant of the geranium family, image here and website with information here. This plant is said to ward off mosquitoes.
Also there are citronella candles used to ward off mosquitoes.
I am currently not sure whether the candles are based on the geranium, or lemongrass plant, or if one is named after the other, or if the citronella is a relatively common species identifier used for plants with a simlar, if unrelated, fragrance.