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Equisetum (/ ˌ ɛ k w ɪ ˈ s iː t əm /; horsetail) is the only living genus in Equisetaceae, a family of vascular plants that reproduce by spores rather than seeds. [2]Equisetum is a "living fossil", the only living genus of the entire subclass Equisetidae, which for over 100 million years was much more diverse and dominated the understorey of late Paleozoic forests.
It is an evergreen herbaceous perennial plant, with green stems, each stem usually topped by a spore-bearing strobilus.The stems, produced in late spring and dying down a year and a half or two years later, are 18–150 cm (7.1–59.1 in) (occasionally to 220 cm (87 in)) tall and 6–18 mm (0.24–0.71 in) diameter, usually unbranched; they are ridged, with 14–50 ridges, and bear whorls of ...
Equisetum arvense, the field horsetail or common horsetail, is an herbaceous perennial plant in the Equisetidae (horsetails) sub-class, native throughout the arctic and temperate regions of the Northern Hemisphere.
The Equisetales existed alongside the Sphenophyllales, but diversified as that group disappeared into extinction, gradually dwindling in diversity to today's single genus Equisetum. The organisms first appear in the fossil record during the late Devonian, [ 1 ] a time when land plants were undergoing a rapid diversification, with roots, seeds ...
It is an herbaceous perennial plant, with separate green photosynthetic sterile stems, and pale yellowish non-photosynthetic spore-bearing fertile stems.The sterile stems, produced in late spring and dying down in late autumn, are 30–100 cm (12–39 in) (rarely to 200 cm (79 in)) tall and 1 cm (0.39 in) diameter, heavily branched, with whorls of 14–40 branches, these up to 20 cm (7.9 in ...
Equisetum hyemale (rough horsetail [2]) is an evergreen perennial herbaceous pteridophyte in the horsetail family Equisetaceae native to Eurasia and Greenland. It was formerly widely treated in a broader sense including a subspecies (subsp. affine) in North America, but this is now treated as a separate species, Equisetum praealtum. [3] [4]
Equisetum uliginosum Muhl. ex Willd. Equisetum fluviatile , the water horsetail or swamp horsetail , is a vascular plant in the horsetail family Equisetaceae . It is a perennial herbaceous pteridophyte that reproduces using spores .
Equisetum palustre, the marsh horsetail, [2] is a perennial herbaceous pteridophyte belonging to the subclass of horsetails (Equisetidae). It is widespread in cooler regions of Eurasia and North America .
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