Difference between revisions of "Equisetum palustre"
Sp. Pl. 2: 1061. 1753.
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Revision as of 18:56, 24 September 2019
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
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.
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.