Heather Angel / Wildflower drifts on disused railway line, flowers include Rosebay willowherb (Epilobium angustifolium), Yellow loosestrife (Lysimachia vulgaris) and Oxeye daisy (Leucanthemum vulgare). Haskayne Cutti...

Chris Mattison / Yellow loosestrife (Lysimachia vulgaris) growing along a lane, Monmouthshire, Wales, UK.

Chris Mattison / Yellow loosestrife (Lysimachia vulgaris) growing along a lane, Monmouthshire, Wales, UK.

Konrad Wothe / Tracking shot looking over a meadow, with Great burnet (Sanguisorba officinalis) and Garden loosestrife (Lysimachia vulgaris) in flower, Bavaria, Germany, July.

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.

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

Chris Mattison / Sea-milkwort (Glaux maritima) growing on rocks, Norwick, Unst, Shetlands, Scotland, UK, June.

Chris Mattison / Sea-milkwort (Glaux maritima) growing on rocks, Norwick, Unst, Shetlands, Scotland, UK, June.

Nick Upton / Yellow pimpernel (Lysimachia nemorum) flowering on damp woodland edge, Nottinghamshire, UK, June.

Chris Mattison / Yellow loosestrife (Lysimachia vulgaris) in flower, growing at the edge of a country road, near Hathersage, Deryshire, Peak District, England, UK, July.

Florian Möllers / Tufted loosestife (Lysimachia thyrsiflora) flowers, Germany, June

Silvia Reiche / Map Butterfly (Araschnia levana) on Yellow Loosestrife (Lysimachia vulgaris), Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Map Butterfly (Araschnia levana) on Yellow Loosestrife (Lysimachia vulgaris), Hoogeloon, Noord-Brabant, Netherlands

Paul Harcourt Davies / Scarlet pimpernel (Anagallis arvensis) in flower, nr Peschici, Gargano, Puglia, Italy. April.

Linda Pitkin / Scarlet pimpernel (Lysimachia arvensis var. caerulea) blue variety, in flower close up, Arta, Mallorca, Balearic Islands. April.

Linda Pitkin / Scarlet pimpernel (Lysimachia arvensis var. caerulea) blue variety, and Southern bird's-foot-trefoil (Lotus ornithopodioides) in flower, Arta, Mallorca, Balearic Islands. April.

Linda Pitkin / Scarlet pimpernel (Lysimachia arvensis var. caerulea) blue variety, in flower, Arta, Mallorca, Balearic Islands. April.

Linda Pitkin / Scarlet pimpernel (Lysimachia arvensis var. caerulea) blue variety, in flower, Arta, Mallorca, Balearic Islands. April.

Linda Pitkin / Scarlet pimpernel (Anagallis arvensis) in flower. Buckland Park Lake, Surrey, UK. August.

Linda Pitkin / Scarlet pimpernel (Anagallis arvensis) in flower. Buckland Park Lake, Surrey, UK. August.

Linda Pitkin / Yellow pimpernel (Lysimachia nemorum) in flower. Surrey, UK. May.

Konrad Wothe / Common brimstone butterfly (Gonepteryx rhamni) in flight over Purple loosestrife (Lythrum salicaria) flowers in summer, Upper Bavaria, Germany. July.

Paul Harcourt Davies / Yellow loosestrife (Lysimachia vulgaris) in flower, Terni, Umbria, Italy. July.

Nick Upton / Yellow loosestrife (Lysimachia vulgaris) flowering in a damp meadow bordering Kenfig Pool, Kenfig National Nature Reserve, Glamorgan, Wales, UK, July.

Nick Upton / Yellow loosestrife (Lysimachia vulgaris) flowering in a damp meadow bordering Kenfig Pool, Kenfig National Nature Reserve, Glamorgan, Wales, UK, July.

Nick Upton / Yellow loosestrife (Lysimachia vulgaris) flowering in in a marshy dune slack, Kenfig National Nature Reserve, Glamorgan, Wales, UK, July.

Nick Upton / Yellow loosestrife (Lysimachia vulgaris) flowerhead, Crymlyn Bog National Nature Reserve, Swansea, Wales, UK. July.

Nick Upton / Sea milkwort (Lysimachia / Glaux maritima) flowering by a small stream near the coast, The Lizard Peninsula, Cornwall, UK. June.

Nick Upton / Sea milkwort (Lysimachia / Glaux maritima) flowering, close up, The Lizard Peninsula, Cornwall, UK. June.

Nick Upton / Sea milkwort (Lysimachia / Glaux maritima) flowering, close up, The Lizard Peninsula, Cornwall, UK. June.

Konrad Wothe / Yellow Loosestrife (Lysimachia vulgaris) flower, Upper Bavaria, Germany

Robert Thompson / Yellow loosestrife (Lysimachia punctata) close up of stamens, County Down, Northern Ireland. July.

Will Watson / Yellow loosestrife (Lysimachia vulgaris), Herefordshire, England, UK.

Jack Dykinga / Arctic starflower (Lysimachia borealis) flowering amid redwood (Sequoia sempervirens) needles, Prairie Creek Redwoods State Park, California, USA.

Pal Hermansen / Dotted loosestrife (Lysymachia punctata) flowers. Photograph taken with the Kirlian technique, a technique which allows imaging of electrical coronal discharge.

Nick Upton / Scarlet pimpernel (Lysimachia arvensis). Wiltshire, England, UK. May.

Linda Pitkin / Scarlet pimpernel (Lysimachia arvensis), blue form. Priest Hill Surrey Wildlife Trust Reserve, England, UK. May.

Linda Pitkin / Yellow pimpernel (Lysimachia nemorum). Surrey, England, UK. July.

Linda Pitkin / Yellow loosestrife (Lysimachia vulgaris). Hampton Court, Richmond Upon Thames, England, UK. July.

Linda Pitkin / Yellow loosestrife (Lysimachia vulgaris). Hampton Court, Richmond Upon Thames, England, UK. July.

Linda Pitkin / Yellow loosestrife (Lysimachia vulgaris) Crystal Palace Park, Kent, England, July.

Linda Pitkin / Dotted loosestrife (Lysimachia punctata) Hollybush Park, Surrey, England, June.

Linda Pitkin / Yellow pimpernel (Lysimachia nemorum) Greybury Wood, Kent, England, May.

Konrad Wothe / Brimstone butterfly (Gonepteryx rhamni) in flight, with Purple loosestrife (Lythrum salicaria) Upper Bavaria, Germany. July.

Konrad Wothe / Brimstone butterfly (Gonepteryx rhamni) in flight, with Purple loosestrife (Lythrum salicaria) Upper Bavaria, Germany. July.

Konrad Wothe / Brimstone butterfly (Gonepteryx rhamni) in flight, with Purple loosestrife (Lythrum salicaria) Upper Bavaria, Germany. July.

Will Watson / Yellow loosestrife (Lyisimachia vulgaris), Moccas Park National Nature Reserve, Herefordshire, England.

Will Watson / Tufted loosestrife (Lysimachia thyrsiflora), emerging from woodland pond, Shatsky National Natural Park, Volyn Oblast, Ukraine, May.