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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.
Equisetum arvense grows in a wide range of conditions, in temperatures less than 5 °C (41 °F) to greater than 20 °C (68 °F) and in areas that receive annual rainfall as low as 100 mm (3.9 in) and as great as 2,000 mm (79 in). It commonly occurs in damp and open woodlands, pastures, arable lands, roadsides, disturbed areas, and near the edge ...
All extant species of Equisetum are herbaceous, and have lost the ability to produce secondary growth. [5] The underground parts of the plants consist of jointed rhizomes, from which roots and aerial axes emerge. The plants have intercalary meristems in each segment of the stem and rhizome that grow as the plant gets taller. This contrasts with ...
Equisetites is a "wastebin taxon" uniting all sorts of large horsetails from the Mesozoic; it is almost certainly paraphyletic and would probably warrant being subsumed in Equisetum. But while some of the species placed there are likely to be ancestral to the modern horsetails, there have been reports of secondary growth in other Equisetites ...
Equisetales is an order of subclass Equisetidae with only one living family, Equisetaceae, containing the genus Equisetum (horsetails), as well as a variety of extinct groups, including the tree-like Calamitaceae.
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 . Description
Equisetum × schaffneri is a horsetail (family Equisetaceae) which is believed to be an ancient, naturally occurring, widely distributed hybrid between Equisetum giganteum and Equisetum myriochaetum, all from the Neotropics. At each node there are as many as nineteen branchlets, each curving downward and then upward, and up to 18 inches (45 cm ...
Equisetum pratense, commonly known as meadow horsetail, shade horsetail or shady horsetail, is a widespread horsetail (Equisetophyta) and it is a pteridophyte.Shade horsetail can be commonly found in forests with tall trees or very thick foliage that can provide shade and tends to grow closer and thicker around streams, ponds and rivers.