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

2. Equisetum palustre Linnaeus, Sp. Pl. 2: 1061. 1753.

Marsh horsetail, prêle des marais

Equisetum palustre var. americanum Victorin

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. 2 n =216.

Cones maturing in summer. Marshes and swamps; 0--1500m; Alta., B.C., Man., N.B., Nfld., 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.

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


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