(Equisetum ramosissimum ramosissimum)
Equisetum ramosissimum Desf., known as branched horsetail, is a species of evergreen horsetail (genus Equisetum, subgenus Hippochaete). It is not the same species as Equisetum ramosissimum Kunth, which is a synonym of Equisetum giganteum.Botanists today recognize two subspecies. The type subspecies, ramosissimum, is native through much of Asia, Europe, and Africa, with an introduced population in the southeast United States. The subspecies debile, sometimes treated as a species, is found in southeast Asia and some Pacific islands. The type subspecies has more obvious branching from the aerial stem than the debile subspecies.