Nick Upton / Yellow loosestrife / Dotted loosestrife (Lysimachia punctata) flowering on a roadside verge, Ceredigon, Wales, UK, June.

Will Watson / Yellow loosestrife (Lysimachia vulgaris), among Common Reed (Phragmites australis), Het Goor Asbroek, Belgium, June.

Ernie Janes / Colourful garden with Phlox, Crocosmia and Loosestrife (Lythum virgatum) seen through lattice window . England, UK.

Ernie Janes / Loosestrife (Lythrum virgatum) 'Dropmore Purple' in flower garden border England, UK.

Ernie Janes / Loosestrife (Lythrum virgatum) 'Dropmore Purple' in flower garden border England, UK.

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

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

Dave Bevan / Red admiral (Vanessa atalanta) nectaring on Gooseneck loosestrife (Lysimachia clethroides), Carmarthenshire, Wales, UK. September.

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

Lynn M Stone / Eastern tiger swallowtail butterfly (Papilio glaucus) female, nectaring on Purple Loosestrife (Lythrum salicaria) in wet meadow, East Haddam, Connecticut, USA

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