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for the water horsetail (E. fiuviatile) . Its stems are tall, slender 

 and wand-like and commonly do not branch until late in spring. 

 The fruiting spike may be found at the top of some of the stems 



EQUISETUM ARVENSE— Fertile frond. 



about the middle of June. Bquisetum palustre resembles this, but 

 rarely occurs in the United States. Another plant — Equisetum 

 littoralc — is much more abundant and is frequently regarded as a 



