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Equisetaceae a unigeneric family with only one extant genus. Equiseturn L. having fifteen species and seventeen hybrids in the world, is represented by six species and one interspecific hybrid in India. The present treatment of the family provides historical notes, key from subgeneric to species level, general morphology of the taxa, their type citation, world and Indian distribution, discussion and notes on anatomy, cytology, gametophyte, micromorphology, ecology, chemistry and uses.
Anukul Datta (Wed,) studied this question.