Michel Roggo / Water hyacinth (Eichhornia sp.) in a clear stream of the Pantanal, Brazil. Photographed for The Freshwater Project. Finalist in the Wildlife Photographer of the Year Awards (WPOY) Competition 2017.

Ernie Janes / Zigzag spiderwort (Tradescantia subaspera) cultivated plant.

Franco Banfi / Split level view of Water hyacinth, (Eichhornia sp.), in a spring close to Bonito, Mato Grosso do Sul, Brazil

Franco Banfi / Split level view of Water hyacinth, (Eichhornia sp.), in a spring close to Bonito, Mato Grosso do Sul, Brazil

Franco Banfi / Water hyacinth, (Eichhornia sp.), from below the surface, Paraguay River, Pantanal, Brazil

Staffan Widstrand / Wild Wonders of China / Water hyacinth (Eichhornia crassipes) and bees at Tongbiguan Nature Reserve, Dehong prefecture, Yunnan province, China. May

Joao Burini / Dayflower (Commelina paludosa), Intervales State Park, Sao Paulo, Atlantic Forest South-East Reserves, UNESCO World Heritage Site, Brazil.

Michel Roggo / Spring creek at very high water level, tributary of floodplain river Rio Miranda. With aquatic plants mainly Water hyacinth (Eichhornia sp.) Pantanal, Mato Grosso do Sul, Brazil. November. Photograp...

Michel Roggo / Spring creek at very high water level, tributary of floodplain river Rio Miranda. With aquatic plants mainly Water hyacinth (Eichhornia sp.) Pantanal, Mato Grosso do Sul, Brazil. November. Photograp...

Michel Roggo / Water hyacinth (Eichhornia sp.) and red Ludwigia (Ludwigia sp.) in a clear stream of the Pantanal, Brazil. Photographed for The Freshwater Project

Michel Roggo / Water hyacinth (Eichhornia sp.) and red Ludwigia (Ludwigia sp.) in a clear stream of the Pantanal, Brazil. Photographed for The Freshwater Project

Michel Roggo / Water hyacinth (Eichhornia sp.) and red Ludwigia (Ludwigia sp.) in a clear stream of the Pantanal, Brazil. Photographed for The Freshwater Project