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

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

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