Hydrophilus is a group of plants in the Restionaceae described as a genus in 1984.Linder, Hans Peter. 1984. Bothalia 15(1–2): 66Tropicos, Hydrophilus H.P.Linder

There is only one known species, Hydrophilus rattrayi, endemic to Cape Province in South Africa.Kew World Checklist of Selected Plant Families

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