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Horsetail

Published online by Cambridge University Press:  12 June 2017

Larry W. Mitich*
Affiliation:
Dep. Bot., Univ. Calif., Davis, CA 95616

Extract

A select few of our present-day weeds are descended from much grander primeval forms. Field horsetail (Equisetum arvense L. ♯ EQUAR) and related species are “degenerate” herbaceous plants whose tree-sized ancestors dominated forests in the Carboniferous period about 300 million years ago. Indeed, early equisetums contributed significantly to the formation of coal beds (12).

Type
Intriguing World of Weeds
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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