Common or field horsetail (Equisetum arvense) is a pest weed. It has a localised distribution in New Zealand, usually found on damp ground such as river banks and drain courses. The plant is easily recognised by its jointed, hollow stems, from which grow whorls of branches. In spring, horsetail produces brown stems topped with a cone of spores. Field horsetail is listed on the National Pest Plant Accord and cannot be sold, propagated or distributed in New Zealand.
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Photograph by E. D. Hatch
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