Bernard Castelein / Deergrass (Scirpus cespitosus) at dawn among Heather (Calluna vulgaris), Groot Schietveld, Wuustwezel, Belgium

Radomir Jakubowski / Marbled white butterfly (Melanargia galathea) on Horsetail (Equisetum), Herbitzheim near Saarbruecken, Saarland, Germany. Finalist in the Macro category and winner of the audience award in the Montpho...

Theo Bosboom,Theo Bosboom / Two pairs of Small spreadwings (Lestes virens) egg depositing in the soft rush in fen, Hondeven, east Holland, August

Bernard Castelein / Deergrass (Trichophorum cespitosum) amongst Cross-leaved heath (Erica tetralix), heathland at dawn. Groot Schietveld, Wuustwezel, Belgium. June 2015.

Nigel Cattlin / Field woodrush (Luzula campestris) flower spike. Berkshire, England, UK. April.

Oscar Dewhurst / Many-coloured rush tyrant (Tachuris rubrigastra) perched on reed stem at the water's edge. Lake Titicaca, Puno, Peru. September. Cropped

Heather Angel / Flowering rush (Butomus umbellatus), drops of nectar fluorescing in UV light. Surrey, England, UK. Focus stacked.

Heather Angel / Flowering rush (Butomus umbellatus) with stamens and stigma, nectar globules at base of carpels. Surrey, England, UK. Focus stacked.

Ross Hoddinott / Blue-tailed damselfly (Ischnura elegans), male on Common horsetail (Equisetum arvense), Cornwall, UK. June.

Nick Upton / Field wood-rush (Luzula campestris) flowering in grassland, Mendip Hills, Somerset, UK, April.

Chris Gomersall / Snow bunting (Plectrophenax nivalis) female in snowy landscape, feeding on seeds of rush. Cairngorms National Park, Scotland. February

Sandra Bartocha / Wood horsetail (Equisetum sylvaticum) and Haircap moss (Polytrichum) Lentiira, Finland, September.

Sandra Bartocha / Wood horsetail (Equisetum sylvaticum) with bokeh sunset light, Grythyttan, Sweden, June.

Michel Roggo / Horsetails (Equisetum) Jiuzhaigou National Park, Jiuzhaigou Valley Scenic and Historic Interest Area UNESCO World Heritage Site, Sichuan, China. May 2013. Photographed for The Freshwater Project

Orsolya Haarberg / Water Horsetails (Equisetum fluviatile) reflected in water, Femundsmarka National Park, Norway.

Orsolya Haarberg / Water horsetail (Equisetum fluviatile) in the Femundsmarka National Park, Norway.

Nick Upton / Dense stand of Great horsetail (Equisteum telmateia) spore cones emerging from canal bank, Bathampton, Bath and northeast Somerset, UK, March.

Nick Upton / Stand of Great horsetail (Equisteum telmateia) spore cones emerging from canal bank, Bathampton, Bath and northeast Somerset, UK, March.

Nick Upton / Stand of Great horsetail (Equisteum telmateia) spore cones emerging from canal bank, Bathampton, Bath and northeast Somerset, UK, March.

MYN / Dirk Funhoff / Great horsetail (Equisetum telmateia), Büchelberg, Pfalz, Germany. September. Meetyourneighbours.net project

MYN / Dirk Funhoff / Great horsetail (Equisetum telmateia), Büchelberg, Pfalz, Germany. September. Meetyourneighbours.net project

SCOTLAND: The Big Picture / Mosiac of heather, bilberry and rush on upland heath, Cairngorms National Park, Scotland, UK, August.

Bernard Castelein / Heather (Calluna vulgaris) and Deergrass (Scirpus cespitosus), Groot Schietveld, Wuustwezel, Belgium September

Cyril Ruoso / Horsetails (Equisetum laevigatum) underwater, Conboy Lake National Wildlife Refuge, Washington, USA. March.

Stephen Dalton / Horsetail (Equisetum palustre) young shoots Sussex, UK

Alex Hyde / Raft Spider (Dolomedes fimbriatus) female resting on the surface of a moorland pool among stems of Horsetail (Equisetum sp.). Nordtirol, Austrian Alps, June.

Graham Eaton / Llyn Cwmorthin, with Common horsetail (Equisetum arvense) Tanygrisiau, Wales, February 2014

Graham Eaton / Common Horsetail (Equisetum arvense) growing on the Llyn Peninsular coast, near Nefyn, North Wales

Colin Varndell / Stem of Great horsetail (Equisetum telmateia) in spring. Dorset, UK April.

Bernard Castelein / Deergrass (Scirpus cespitosus) growing between Cross-leaved heath (Erica tetralix) flowers at dawn, Groot Schietveld, Wuustwezel, Belgium, June.

Bernard Castelein / Deergrass (Scirpus cespitosus) growing between Cross-leaved heath (Erica tetralix) flowers at dawn, Groot Schietveld, Wuustwezel, Belgium, June.

Bernard Castelein / Field horsetail (Equisetum arvense) fertile shoots, Brasschaat, Belgium, April.

Martin Gabriel / Marsh in mist, Po Delta, Italy, November.

Ernie Janes / Five bar farm gate with Bird foot trefoil (Lotus corniculatus), Bramble (Rubus sp) and Horsetails (Equisetum) Norfolk, England, UK. July.

Nick Upton / Marsh horsetail (Equisteum palustre) with spore cones growing on marshy ground around a pond, Cornwall, UK, April.

Willem Kolvoort / Flowering rush (Butomus umbellatus) in flower, Naardermeer, Holland. August.

Chris Mattison / Water Horsetail / Swamp Horsetail (Equisetum fluvatile) Sierra Nevada, California, USA, May.

Chris Mattison / Great horsetail (Equisetum telmateia) fertile frond, Derbyshire, UK. April.

Nick Upton / Low angle view of Great horsetail (Equisteum telmateia) sterile stems emerging from marshy ground fringing a pond, Wiltshire, UK, May.

Nick Upton / Low angle view of Great horsetail (Equisteum telmateia) spore cones emerging from marshy ground fringing a pond, Wiltshire, UK, April.

Nick Upton / Spore cones of Great horsetail (Equisteum telmateia) amerging from marshy ground around a pond, Wiltshire, UK, April.

Ernie Janes / Flowering Rush (Butomus umbellatus) in flower, England, UK, August.

Chris Mattison / Marsh horsetail (Equisetum palustre) fertile frond with cone. Derbyshire, England, UK, July.

Nick Upton / Wigeon (Anas penelope) drake walking on grass around margin of a marshland Sedge pool with a Juncus rush it has grazed protruding from its beak, Gloucestershire, UK, April.

Colin Varndell / Marsh horsetail (Equisetum telmateia) spore cones. Dorset, UK April 2013

Theo Bosboom / Water horsetail (Equisetum fluviatile) close-up, De Bruuk, the Netherlands, May

Philippe Clement / Flowering Grass rush {Butomus umbellatus} France

Philippe Clement / Flowering Grass rush {Butomus umbellatus} France

Nigel Cattlin / Field woodrush / Good Friday grass (Luzula campestris) a weed rush flowering in a garden lawn, April Berkshire, England, UK.

Guy Edwardes / Marsh fritillary butterfly (Euphydryas aurinia) roosting on Horsetail (Equisetum arvense), Rhodope Mountains, Bulgaria. June.

Will Watson / Field woodrush (Luzula campestris) in flower, Stocking Meadow, Herefordshire Wildlife Trust Reserve, England, UK. May, Focus stacked.

Staffan Widstrand / Flowering rush (Butomus umbellatus) in flower, close up, Gelderse Poort, near Nijmegen, The Netherlands. July.

Linda Pitkin / Field wood-rush (Luzula campestris) in flower. Surrey, UK. May.

Jean E. Roche / Soft rush (Juncus jacquinii) in flower. Provence-Alpes-Cotes-d'Azur, France. July.

Orsolya Haarberg / Water horsetail (Equisetum fluviatile) reflecting in water, Femundsmarka National Park, Norway. September.

Nick Upton / Common horsetail (Equisetum arvense) dense stand of sterile stems in around pool margin in damp deciduous woodland, Kenfig National Nature Reserve, Glamorgan, Wales, UK, May.

Nick Upton / Common horsetail (Equisetum arvense) dense stand of sterile stems in damp deciduous woodland, Kenfig National Nature Reserve, Glamorgan, Wales, UK, May.

Nick Upton / Common horsetail (Equisetum arvense) dense stand of sterile stems around pool margin in damp deciduous woodland, Kenfig National Nature Reserve, Glamorgan, Wales, UK, May.

Nick Upton / Marsh horsetail (Equisetum palustre) with mature spore cone in a marshy meadow, Kenfig National Nature Reserve, Glamorgan, Wales, UK, May.

Nigel Cattlin / Common horsetail (Equisetum arvense) spore-bearing and non-photosynthetic fertile shoots of a rhizomatous plant.

Jussi Murtosaari / Flowering rush (Butomus umbellatus) in flower, Finland. August.

Will Watson / Brown china-mark moth (Elophila nymphaeata) on Common spike-rush (Eleocharis palustris), Myndd Ilytud Common, Powys, Wales, UK.

Pal Hermansen / Field horsetail (Equisetum arvensis) Photograph taken with the Kirlian technique, a technique which allows imaging of electrical coronal discharge.

Dave Watts / Spiny-head mat-rush (Lomandra longifolia). Tasmania, Australia. December.

Nick Upton / Giant horsetail (Equisetum telmateia) stand in damp woodland. Wiltshire, England, UK. June.

Michael Hutchinson / Emperor dragonfly (Anax imperator) newly emerged adult hangs from flowering rush (Butomus umbellatus) with two exuvia above garden pond, Bristol, UK, May.

Michael Hutchinson / Emperor dragonfly, (Anax imperator) newly emerged adult hangs from flowering rush (Butomus umbellatus) with two exuvia above garden pond, Bristol, UK, May.

Mike Read / Raft spider (Dolomedes fimbriatus) young amongst grass and rush stems, Arne RSPB Reserve, Dorset, England, UK, August.

Linda Pitkin / Great horsetail (Equisetum telmateia) Edolphs Copse, Charlwood, Surrey, England, May.

Linda Pitkin / Great horsetail (Equisetum telmateia) Edolphs Copse, Charlwood, Surrey, England, May.

Linda Pitkin / Great horsetail (Equisetum telmateia) Edolphs Copse, Charlwood, Surrey, England, May.

Linda Pitkin / Marsh horsetail (Equisetum palustre) Papercourt Marshes Nature Reserve (SWT), Surrey, England, May.

Linda Pitkin / Flowering-rush (Butomus umbellatus), locally rare plant, Surrey, England, June.

Linda Pitkin / Flowering-rush (Butomus umbellatus), locally rare plantLangham Ponds SSSI, Surrey, England, July.

Linda Pitkin / Flowering-rush (Butomus umbellatus), locally rare plantLangham Ponds SSSI, Runnymede, Surrey, England, July.

Linda Pitkin / Sea club-rush (Bolboschoenus maritimus), locally rare plant,In foreground, with Bulrush, Reedmace (Typha latifolia) behind. Molesey Reservoirs Nature Reserve, Surrey, England, July.

Nigel Cattlin / Common horsetail (Equisetum arvense) young plants in a sugar beet crop, France