Equisetum palustre

Linnaeus

Sp. Pl. 2: 1061. 1753.

Common names: Marsh horsetail prêle des marais
Synonyms: Equisetum palustre var. americanum Victorin
Treatment appears in FNA Volume 2.

Aerial stems monomorphic, green, branched or unbranched, 20–80 cm; hollow center small, to 1/3 stem diam.; vallecular canals nearly as large. Sheaths elongate, 4–9 × 2–5 mm; teeth dark, 5–10, narrow, 2–5 mm, margins white, scarious. Branches when present only from midstem nodes, spreading, hollow; ridges 4–6; valleys rounded; 1st internode of each branch shorter than subtending stem sheath; sheath teeth narrow. 2n =216.


Phenology: Cones maturing in summer.
Habitat: Marshes and swamps
Elevation: 0–1500m

Distribution

V2 358-distribution-map.gif

Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Ont., P.E.I., Que., Sask., Yukon, Alaska, Calif., Idaho, Maine, Mich., Minn., Mont., N.H., N.Y., N.Dak., Oreg., Pa., Vt., Wash., Wis., Eurasia s to Himalayas, n China, Korea, Japan.

Discussion

The name Equisetum palustre var. americanum has been used for specimens from the flora that have longer teeth than those from Eurasia.

Selected References

None.

Lower Taxa

None.
... more about "Equisetum palustre"
Richard L. Hauke +
Linnaeus +
Undefined subg. Hippochaete +
Marsh horsetail +  and prêle des marais +
Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. +, N.W.T. +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Alaska +, Calif. +, Idaho +, Maine +, Mich. +, Minn. +, Mont. +, N.H. +, N.Y. +, N.Dak. +, Oreg. +, Pa. +, Vt. +, Wash. +, Wis. +, Eurasia s to Himalayas +, n China +, Korea +  and Japan. +
0–1500m +
Marshes and swamps +
Cones maturing in summer. +
Equisetum palustre var. americanum +
Equisetum palustre +
Equisetum subg. Hippochaete +
species +