|horsetail (Equisetum spp.)||
horsetail, scouring rush (Equisetum spp.; HORSETAIL FAMILY [Equisetaceae]) Mostly small to medium-sized erect plants with rigid, hollow, jointed, fluted, branched or unbranched stems. Small, triangular, colorless 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-edge habitats. 
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