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Equisetum arvense L.
FIELD HORSETAIL
Allostelites arvense (L) Börner; Equisetum torgesianum Rothm pro parte; Equisetum umbrosum auct, non G Mey ex Willd

Life   Plantae   Pteridophyta   Equisetaceae   Equisetum

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

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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 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
Equisetum arvense
© Copyright Bobby Hattaway 2011 · 3
Equisetum arvense

Equisetum arvense
© Copyright Bobby Hattaway 2011 · 3
Equisetum arvense
Equisetum arvense
© Copyright Malcolm Storey 2011-2118 · 3
Equisetum arvense

Equisetum arvense
© Copyright Malcolm Storey 2011-2118 · 3
Equisetum arvense
Equisetum arvense
© Copyright Malcolm Storey 2011-2118 · 3
Equisetum arvense

Equisetum arvense
© Copyright Malcolm Storey 2011-2118 · 3
Equisetum arvense
Equisetum arvense
© Copyright Malcolm Storey 2011-2118 · 3
Equisetum arvense

Associates · map
FamilyScientific name @ source (records)
Davidiellaceae  Cladosporium herbarum @ BPI (1)
Dermateaceae  Cylindrosporium equiseti @ BPI (4)

Gloeosporium equiseti @ BPI (3)

Gloeosporium kriegerianum @ BPI (2)
Helicinidae  Hendersonia equiseti @ BPI (1)
Helotiaceae  Hymenoscyphus rhodoleucus @ BPI (1)

Stamnaria equiseti @ BPI (3)

Stamnaria persoonii @ BPI (1)
Mycosphaerellaceae  Mycosphaerella equiseti @ BPI (2)

Phloeospora equiseti @ BPI (3)

Rhabdospora equiseti @ 388339B (1); 388339A (1)

Septoria equiseti @ BPI (4)
_  Phialea rhodoleuca @ BPI (1)

Phragmonaevia laetissima @ BPI (2)

Titaeospora detospora @ BPI (2)

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FNA | Family List | FNA Vol. 2 | Equisetaceae | Equisetum

4. Equisetum arvense Linnaeus, Sp. Pl. 2: 1061. 1753.

Field horsetail, common horsetail, prêle des champs

Aerial stems dimorphic; vegetative stems green, branched, 2--60(--100) cm; hollow center 1/3--2/3 stem diam. Sheaths squarish in face view, 2--5(--10) × 2--5(--9) mm; teeth dark, 4--14, narrow, 1--3.5 mm, often cohering in pairs. Branches in regular whorls, ascending, solid; ridges 3--4; valleys channeled; 1st internode of each branch longer than subtending stem sheath; sheath teeth attenuate. Fertile stems brown, lacking stomates, unbranched, shorter than vegetative stems, with larger sheaths, fleshy, ephemeral. 2 n =ca. 216.

Cones maturing in early spring. Roadsides, riverbanks, fields, marshes, pastures, tundra; 0--3200 m; Greenland; St. Pierre and Miquelon; Alta., B.C., Man., N.B., Nfld., N.W.T., N.S., Ont., P.E.I., Que., Sask., Yukon; all states except Fla., La., Miss., S.C.; Eurasia s to Himalayas, c China, Korea, Japan.

Among the many infraspecific taxa that have been named in this species, Equisetum arvense var. boreale Bongard has been most generally accepted and has been applied to plants with tall, erect stems with 3-ridged branches. Because both 3-ridged and 4-ridged branches may occur on a single stem, the variety boreale is not recognized here as distinct (R.L. Hauke 1966).

Updated: 2021-08-05 02:42:26 gmt
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