Webster's English Dictionary

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equisetum

eq.ui.se.tum \.ek-w*-'se-t-*m\ \-'se-t-*\ n or equisetums or eq.ui.se.ta 
   [NL, genus name, fr. L equisaetum horsetail (plant), fr. equus hors] pl e + 
   saeta bristle : any of a genus (Equisetum) of lower tracheophytes 
   comprising peren nial plants that spread by creeping rhizomes, are 
   homosporous and asexual, and have leaves reduced to nodal sheaths on the 
   hollow jointed grooved shoots