Cyperus papyrus L.
Native to Africa (i.e. Ethiopia, Sudan, Kenya, Tanzania, Uganda, Cameroon, Zaire, Benin, Nigeria, Senegal, Malawi, Mozambique, Zimbabwe, Botswana, Namibia, South Africa and Madagascar).
Naturalised in south-eastern and central Queensland, in the coastal districts of northern and central New South Wales, and near Perth in south-western Western Australia.
Also naturalised overseas in southern USA (i.e. California, Louisiana and Florida) and Hawaii.
This species is regarded as a minor environmental weed or potential environmental weed in Queensland and New South Wales. It has escaped cultivation and invaded the margins of permanent water bodies in south-eastern Queensland and northern New South Wales. For example, infestations were recently targeted for removal from Seaham Swamp Nature Reserve at Port Stephens on the mid-north coast of New South Wales.
Papyrus (Cyperus papyrus) is also a weed of deep water channels in the Warriewood Wetlands and a common weed in the Lakes of Cherrybrook Reserve in suburban northern Sydney. In south-western Western Australia it grows in permanently wet sites and in abandoned parklands. This rapidly growing species can spread to cover areas of open water, preventing other aquatic species from growing, and reducing light levels to submerged native plants.