SCOTLAND: The Big Picture / Purple loosestrife (Lythrum salicaria) flower spikes backlit in evening light, Scotland, UK, September

SCOTLAND: The Big Picture / Purple loosestrife (Lythrum salicaria) flower spikes in evening light, Scotland, UK, September

Staffan Widstrand / Wild Wonders of China / Purple loosestrife (Lythrum salicaria) found in Wu Ying District Nature Reserve, near Yichun city, Heilongjiang Province, China

Konrad Wothe / Slow motion clip of a Blue butterfly (Lycaenidae) flying and nectaring on Purple loosestrife (Lythrum salicaria), Bavaria, Germany, July.

Konrad Wothe / Slow motion clip of a Blue butterfly (Lycaenidae) flying and nectaring on Purple loosestrife (Lythrum salicaria), disturbed by a Skipper (Thymelicus), Bavaria, Germany, July.

Konrad Wothe / Slow motion clip of two Blue butterflies (Lycaenidae) nectaring on Purple loosestrife (Lythrum salicaria), disturbed by a Skipper (Thymelicus) Bavaria, Germany, July.

Sue Daly / Purple loosestrife (Lythrum salicaria), Jersey, British Channel Islands, August.

Stephen Dalton / Purple loosestrife (Lythrum salicaria) Sussex, England, UK, August.

Ann & Steve Toon / Purple loosestrife (Lythrum salicaria) growing by coast, Arran, Scotland, July.

Lynn M Stone / Monarch butterfly (Danaus plexippus) nectaring on Purple Loosestrife in wet meadow, East Haddam, Connecticut, USA

Philippe Clement / Purple loosestrife (Lythrum salicaria) in flower, Belgium, August.

Philippe Clement / Purple loosestrife (Lythrum salicaria) in flower, Belgium, August.