Nigel Cattlin / Branched bur-reed (Sparganium erectum) on canal bank. Berkshire, England, UK. June.

Adrian Davies / Branched bur reed (Sparganium erectum) Surrey, UK, August.

Bernard Castelein / Simplestem bur-reed (Sparganium erectum), Peerdsbos, Brasschaat, Belgium, July.

Nick Upton / Branched bur-reed (Sparganium erectum) flowering in a small stream with white female flowers with protruding white styles and the spiky burs they develop into below, and rounder male flowers on branch...

Nick Upton / Branched bur-reed (Sparganium erectum) flowering in a small stream with white female flowers with protruding white styles and the spiky burs they develop into below, and rounder male flowers on branch...

Willem Kolvoort / European bur-reed (Sparganium emersum) in De Weerribben-Wieden National Park National Park, Holland. August.

Willem Kolvoort / European bur-reed (Sparganium emersum) in flower, central Holland. July.

Willem Kolvoort / European bur-reed (Sparganium emersum) in flower, central Holland. July.

Philippe Clement / Narrowleaf bur-reed {Sparganium emersum} France

Philippe Clement / Close-up of Narrowleaf bur-reed flower {Sparganium emersum} France

Will Watson / Eutrophic ditch with bank erosion caused by cattle, with Spirogyra and Enteromorpha algae and floating leaves of Unbranched bur-reed (Sparganium erersum), Herefordshire Lowlands, England, UK. June, 20...

Will Watson / Black colonel (Odontomyia tigrina), a soldier fly, on Branched bur-reed (Sparganium erectum) pond, Herefordshire, England, UK. June.