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...

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

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