Equisetum palustre
Equisetum subg. Hippochaete
marsh horsetail, prêle des marais
scouring rush
elongate, 4–9 × 2–5 mm;
teeth dark, 5–10, narrow, 2–5 mm, margins white, scarious.
monomorphic, green, branched or unbranched, 20–80 cm;
hollow center small, to 1/3 stem diam.;
vallecular canals nearly as large.
persisting more than a year (except Equisetum laevigatum), with sunken stomates in single lines on each side of stem valleys;
branches generally lacking or few (except E. ramosissimum).
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.
sharply pointed at apex (except E. laevigatum).
=216.
Equisetum palustre
Equisetum subg. Hippochaete
The name Equisetum palustre var. americanum has been used for specimens from the flora that have longer teeth than those from Eurasia.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
The only species of this subgenus in the flora that is regularly branched, bearing several branches per midstem node, is Equisetum ramosissimum. The others, though normally unbranched, with age or injury may develop one or a few branches, usually from the proximal or most distal nodes.
Species 7 (5 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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