Overview

Distribution

National Distribution

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Physical Description

Morphology

Description

Subspecies 2 (1 in the flora): North America, Europe, n Africa, w Asia.
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Ecology

Associations

In Great Britain and/or Ireland:
Foodplant / feeds on
pycnidium of Conothyrium coelomycetous anamorph of Coniothyrium equiseti feeds on Equisetum telmateia

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Molecular Biology and Genetics

Molecular Biology

Barcode data: Equisetum telmateia

The following is a representative barcode sequence, the centroid of all available sequences for this species.


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Statistics of barcoding coverage: Equisetum telmateia

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 2
Specimens with Barcodes: 6
Species With Barcodes: 1
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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: N4 - Apparently Secure

United States

Rounded National Status Rank: NNR - Unranked

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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.

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Wikipedia

Equisetum telmateia

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.[1][2] 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.

Spore-bearing strobilus

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.[3] Occasional plants produce stems that are both fertile and photosynthetic.[2][4][5]

It is found in damp shady places, spring fens and seepage lines, usually in open woodlands, commonly forming large clonal colonies.[2][4]

There are two subspecies:[1][5]

  • 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.

References[edit]

  1. ^ a b Germplasm Resources Information Network: Equisetum telmateia
  2. ^ a b c Hyde, H. A., Wade, A. E., & Harrison, S. G. (1978). Welsh Ferns. National Museum of Wales ISBN 0-7200-0210-9.
  3. ^ http://www2.fiu.edu/~chusb001/GiantEquisetum/Ecophysiology.html#RhizArch
  4. ^ a b 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. 
  5. ^ a b Flora of North America: Equisetum telmateia
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