Equisetum spp.; horsetail, scouring rush [Equisetaceae]  Mostly small to medium-sized erect plants with rigid, hollow, jointed, fluted, branched or unbranched stems.  Highly reduced, triangular, non-photosynthetic leaves form a collar at each node.  Spores develop in a conelike strobilus, but plants spread mainly by underground rhizomes.  In a few species, the strobilus is borne on a separate fertile stalk that has no chlorophyll.  More than 10 Wisconsin species range from aquatic to woodland to road-side habitats.  [006]

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