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1b. Equisetum Subg. Hippochaete (J. Milde) Baker, Handb. Fern-Allies. 3. 1887.
Scouring rush
Hippochaete J.Milde, Bot. Zeitung (Berlin) 23: 297. 1865
Aerial stems 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 ). Cones sharply pointed at apex (except E . laevigatum ).
Species 7 (5 in the flora): nearly worldwide.
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.
SELECTED REFERENCES Hauke, R.L. 1963. A taxonomic monograph of Equisetum subgenus Hippochaete. Beih. Nova Hedwigia 8: 1--123.
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