Piotr Naskrecki / Field Horsetail (Equisetum arvense) releasing sporophytes, Estabrook Woods, Massachusetts

Paul Hobson / Common field Horsetails (Equisetum arvense) in spring showing cones, Yorkshire, UK, May

Paul Hobson / Common field Horsetails (Equisetum arvense) in spring showing cones, Yorkshire, UK, May

Paul Hobson / Common field Horsetails (Equisetum arvense) in spring showing cones, Yorkshire, UK, May

MYN / Niall Benvie / Male common horsetail {Equisetum arvense}, May, Mre og Romsdal, Norway meetyourneighbours.net project

MYN / Niall Benvie / Three male Common horsetails {Equisetum arvense}, May, Mre og Romsdal, Norway, meetyourneighbours.net project

Nature Production / Common Field Horsetail {Equisetum arvense} with roots, flowering stalk and fronds visible, Gumma, Japan

Nature Production / Common Field Horsetail dry spores (microscopic photography) {Equisetum arvense} Japan

Nature Production / Common Field Horsetails {Equisetum arvense} Japan

Philippe Clement / Close up of stem of Common scouring rush {Equisetum hyemale} Luxembourg

Philippe Clement / Common horsetails {Equisetum arvense} France

Philippe Clement / Common horsetails growing beside water {Equisetum arvense} France