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|Noun||1.||genus Equisetum - horsetails; coextensive with the family Equisetaceae|
fern genus - genera of ferns and fern allies
Equisetaceae, family Equisetaceae, horsetail family - sole surviving family of the Equisetales: fern allies
horsetail - perennial rushlike flowerless herbs with jointed hollow stems and narrow toothlike leaves that spread by creeping rhizomes; tend to become weedy; common in northern hemisphere; some in Africa and South America