Theo Bosboom / Floating sweet-grass (Glyceria fluitans) in lake, Bjornlandet National Park, North Sweden. Finalist in the Plants and Fungi category of the Wildlife Photographer of the Year Awards (WPOY) Competition...

Willem Kolvoort / Marsh marigold (Caltha palustris) with Mannagrass (Glyceria fluitans) and Common water crowfoot (Ranunculus aquatilis) along brook, North Holland. April.

Willem Kolvoort / Marsh marigold (Caltha palustris) with Mannagrass (Glyceria fluitans) and Common water crowfoot (Ranunculus aquatilis) along brook with seep inflow, North Holland. April.

Theo Bosboom / Floating Sweetgrass (Glyceria fluitans) captured in the ice of a small fen in nature area Deeler Woud Nature Reserve, the Netherlands, December 2008

Theo Bosboom / Floating Sweetgrass (Glyceria fluitans) captured in the ice of a small fen in nature area Deeler Woud Nature Reserve, the Netherlands, January

Will Watson / Floating sweet-grass (Glyceria fluitans) covering surface of Ice Age pond, The Sturts East Nature Reserve, Herefordshire, England, UK, April.

Linda Pitkin / Reed sweet-grass (Glyceria maxima), at edge of pond, Clandon Wood, Surrey, England, UK, July.