Regularity: Regularly occurring
Regularity: Regularly occurring
Habitat and Ecology
Foodplant / feeds on
pycnidium of Conothyrium coelomycetous anamorph of Coniothyrium equiseti feeds on Equisetum telmateia
Molecular Biology and Genetics
Barcode data: Equisetum telmateia
Statistics of barcoding coverage: Equisetum telmateia
Public Records: 2
Specimens with Barcodes: 6
Species With Barcodes: 1
IUCN Red List Assessment
Red List Category
Red List Criteria
National NatureServe Conservation Status
Rounded National Status Rank: N4 - Apparently Secure
Rounded National Status Rank: NNR - Unranked
NatureServe Conservation Status
Rounded Global Status Rank: G5 - Secure
Reasons: Occurs in Europe, southwestern Asia, and north Africa (the typical variety) and along the western coast of North America (var. braunii), where common.
There is no information available on population trends in this species but it is locally widespread and abundant.
There is evidence of localized habitat degradation in some areas where this species occurs, however, this is not thought to be severe enough to pose a threat to the species currently or in the near future. The species appears to be tolerant of some disturbance as it grows in wastelands and agricultural areas like paddy fields.
In Sweden, conservation efforts have been made but it is argued that gradual population declines will eventually lead to its unavoidable extinction which may be characteristic for populations of long-lived perennials on drained or otherwise damaged sites. In such situations, it may be questioned whether conservation efforts, known to only postpone the extinction, are worthwhile (Mattiasson 2000).
The few known localities of this plant outside of the forest zone of the East Mediterranean requires conservation specially against converting of its habitat for agricultural purposes.
Equisetum telmateia (great horsetail or northern giant horsetail) is a species of Equisetum (horsetail) with an unusual distribution, with one subspecies native to Europe, western Asia and northwest Africa, and a second subspecies native to western North America. The North American subspecies is often simply but ambiguously called "giant horsetail", but that name may just as well refer to the Latin American Equisetum giganteum and Equisetum myriochaetum.
It is a 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 30–150 cm (rarely to 240 cm) tall (the tallest species of horsetail outside of tropical regions) and 1 cm diameter, heavily branched, with whorls of 14–40 branches, these up to 20 cm long, 1–2 mm diameter and unbranched, emerging from the axils of a ring of bracts. The fertile stems are produced in early spring before the sterile shoots, growing to 15–45 cm tall with an apical spore-bearing strobilus 4–10 cm long and 1–2 cm broad, and no side branches; the spores disperse in mid spring, with the fertile stems dying immediately after spore release. It also spreads by means of rhizomes that have been observed to penetrate 4 meters into wet clay soil, spreading laterally in multiple layers. Occasional plants produce stems that are both fertile and photosynthetic.
- Equisetum telmateia subsp. telmateia. Great Horsetail. Europe, western Asia, northwest Africa. Main stem between branch whorls pale greenish white.
- Equisetum telmateia subsp. braunii (Milde) Hauke. Northern Giant Horsetail. Western North America, from southeastern Alaska and western British Columbia south to California. Main stem between branch whorls green.
- Germplasm Resources Information Network: Equisetum telmateia
- Hyde, H. A., Wade, A. E., & Harrison, S. G. (1978). Welsh Ferns. National Museum of Wales ISBN 0-7200-0210-9.
- Clapham, A. R., Tutin, T. G., & Warburg, E. F. (1981). Excursion Flora of the British Isles (3rd ed. ed.). Cambridge: University Press. p. 6. ISBN 0-521-23290-2.
- Flora of North America: Equisetum telmateia
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