horsetail
Cross references: 1. scouring rush horse.tail \'ho.r-.sta-l\ n : any of a genus (Equisetum) of perennial flowerless plants related to the ferns
Cross references: 1. scouring rush horse.tail \'ho.r-.sta-l\ n : any of a genus (Equisetum) of perennial flowerless plants related to the ferns