IE. Step. 



Fia. 662. GREAT ~H.ORSE r rA.n J _(Equisetum maximum). 



This is a much stouter and taller plant than the other native species, attaining to a height of six feet or more, the 



white stem with a diameter of half an inch . The fertile stem is even stouter, but seldom more than a foot in length. 



EUROPE, NORTH AND WEST ASIA, NORTH AFRICA, and NORTH AMERICA. 



519 



