in taxon plant used for medicine filed horsetail plant PLANTS:EQAR Equisetum arvense, the field horsetail or common horsetail, is an herbaceous perennial horsetail native throughout the arctic and temperate regions of the northern hemisphere. *Equisetum arvense* has been used in traditional Austrian herbal medicine internally as tea, or externally as baths or compresses, for treatment of disorders of the skin, locomotor system, kidneys and urinary tract, rheumatism and gout. [https://en.wikipedia.org/wiki/Equisetum_arvense] field horsetail common horsetail common horsetail equisetum arvense Equisetum arvense requires discussion