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

Will Watson / Marsh Frog (Pelophylax ridibundus) basking on Bur-reed (Sparganium sp.) leaves, flood-plain pool, Stare Okopy, Poland.

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.

Adrian Davies / Branched bur-reed (Sparganium erectum) flowering, County Meath, Republic of Ireland, July

Colin Varndell / Branched Bur-Reed (Sparganium). Little Sea, Studland, Dorset, June.

Willem Kolvoort / Underwater view of Water violet (Hottonia palustris) with Unbranched bur reed on the right and left, Lake Naarden, Holland