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Equisetum L.
HORSETAIL
Life   Plantae   Pteridophyta   Equisetaceae

Equisetum hyemale, Horsetail
© Copyright Sheryl Pollock 2011 · 8
Equisetum hyemale, Horsetail

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Equisetum arvense, whole plant - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Equisetum arvense, whole plant - unspecified
Equisetum arvense
© Copyright Steve Baskauf, 2002-2011 · 4
Equisetum arvense

Equisetum arvense
© Copyright Steve Baskauf, 2002-2011 · 4
Equisetum arvense
Equisetum arvense
© Copyright Steve Baskauf, 2002-2011 · 4
Equisetum arvense

Equisetum arvense, whole plant - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Equisetum arvense, whole plant - unspecified
Equisetum hyemale, whole plant - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Equisetum hyemale, whole plant - unspecified

Equisetum hyemale
© Copyright Steve Baskauf, 2002-2011 · 4
Equisetum hyemale
Equisetum hyemale
© Copyright Steve Baskauf, 2002-2011 · 4
Equisetum hyemale

Equisetum hyemale
© Copyright Steve Baskauf, 2002-2011 · 4
Equisetum hyemale
Equisetum hyemale, whole plant - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Equisetum hyemale, whole plant - unspecified

Equisetum hyemale
© Copyright Steve Baskauf, 2002-2011 · 4
Equisetum hyemale
Equisetum arvense
© Les Mehrhoff, 2008-2010 · 4
Equisetum arvense

Equisetum arvense
© Copyright Bobby Hattaway 2011 · 3
Equisetum arvense
Equisetum arvense
© Copyright Bobby Hattaway 2011 · 3
Equisetum arvense

Associates · map
FamilyScientific name @ source (records)
Cixiidae  Cixius cultus @ AMNH_IZC (10)

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Following modified from Flora of North America
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FNA | Family List | FNA Vol. 2 | Equisetaceae

1. Equisetum Linnaeus, Sp. Pl. 2: 1061. 1753; Gen. Pl. ed. 5, 484, 1754.

Horsetail, scouring rush, prêle [Latin equis, horse, and seta, bristle, referring to the coarse black roots of E . fluviatile ]

Richard L. Hauke

Equisetum ramosissimum

Credit: Harvard University Herbaria

Plants perennial, rhizomatous. Aerial stems annual or perennial. Stems with hollow center and series of small carinal (under the ridges) and larger vallecular (under the valleys) canals. Leaves in whorls, fused part of length into sheaths. Stem ridges traversing length of internode and continuing into sheaths, terminating in sheath teeth. Branches when present borne at nodes, erupting through base of subtending sheath. Cones terminal on green stems or, in some species, terminating special, reproductive, brown stems, composed of whorls of peltate sporophylls; cone apices rounded or sharply pointed; sporangia 5--10 per sporophyll, pendent, attached to inner surface of sporophylls, elongate, dehiscing longitudinally. x =108.

Species 15 (11 in the flora): nearly worldwide.

Equisetum occurs in moist places such as riverbanks, lakeshores, roadsides, ditches, seepage areas, meadows, marshes, and wet woodlands. Aerial stems of Equisetum vary considerably in habit and appearance, even on individual plants, because of environmentally induced modifications affecting height and branching. Many taxonomically trivial varieties and forms have been named. For an extended discussion of this, see R.L. Hauke (1966). Four widespread, named hybrids are treated in the key and fully described below.

In species descriptions and in the key, length and width are given for the leaf sheath, excluding the free teeth. If the length and width of flattened sheaths are approximately equal and the sides are straight, the sheath is more or less square in face view, i.e., about as long as broad; if the length is greater than the width and the sides are straight, the sheath is more or less elongate in face view, i.e., longer than broad; if the length is greater than the width and the sides are slightly convex, the sheath is elliptic in face view. Stomates are usually visible at 20× magnification.

Reticulation in Equisetum is summarized in the reticulograms, which show the known and expected hybrids in North America. Most of those in Equisetum subg. Equisetum are still unknown in North America, but they should be sought, especially north of 45° N latitude. According to W.J. Cody and D.M. Britton (1989), E . × font-queri occurs rarely in British Columbia and materials possibly representing E . × arcticum Rothmaler have been taken in the Richardson Mountain region of Mackenzie. R.L. Hauke (1978) cited collections of E . × font-queri from British Columbia and California.

SELECTED REFERENCES

Hauke, R.L. 1966. A systematic study of Equisetum arvense . Nova Hedwigia 13: 81--109. Hauke, R.L. 1979. Equisetum ramosissimum in North America. Amer. Fern J. 69: 1--5.

(Key to species of Equisetum)

Following modified from CalPhotos
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http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Equisetum+sp.&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Equisetum+sp.&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant

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Number of matches : 4
Query: SELECT * FROM img WHERE ready=1 and taxon like "Equisetum sp.%" and (lifeform != "specimen_tag" OR lifeform != "Plant") ORDER BY taxon

Click on the thumbnail to see an enlargement

Equisetum sp.
Equisetum sp.
Horsetail, Scouring Rush
ID: 8253 3202 0179 0006 [detail]
Beatrice F. Howitt
© 1999 California Academy of Sciences

Equisetum sp.
Equisetum sp.
ID: 1338 3161 0873 0066 [detail]
Dr. Robert T. and Margaret Orr
© 2004 California Academy of Sciences

Equisetum sp.
Equisetum sp.
Horsetails
ID: 1336 3162 1813 0011 [detail]
Jo-Ann Ordano
© 2005 California Academy of Sciences

Equisetum sp.
Equisetum sp.
Horsetail
ID: 6666 6666 0514 0082 [detail]
Gerald and Buff Corsi
© 2014 California Academy of Sciences

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