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Equisetum × schaffneri
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Division:	Polypodiophyta
Class:	Polypodiopsida
Subclass:	Equisetidae
Order:	Equisetales
Family:	Equisetaceae
Genus:	Equisetum
Species:	E. × schaffneri
Binomial name
Equisetum × schaffneri Milde

Equisetum × schaffneri is a horsetail (family Equisetaceae) which is believed to be an ancient, naturally occurring, widely distributed hybrid between Equisetum giganteum and Equisetum myriochaetum, all from the Neotropics. At each node there are as many as nineteen branchlets, each curving downward and then upward, and up to 18 inches (45 cm) in length.

For a long time it was widely accepted that E. schaffneri had culms up to four inches (ten cm) thick, but Dr. Richard L. Hauks and Chad Husby have shown that these reports were based on a misplaced decimal point, and the true diameter of the culm is one-half inch (one cm).

References

1. Zuchowski, Willow (2007). Tropical Plants of Costa Rica. Ithaca, N.Y.: Cornell Univ. Press. pp. 444–445. ISBN 978-0-8014-4588-0.
2. Campbell, Prof.Douglas H. (1905). The Structure and Development of Mosses and Ferns. New York: MacMillon & Co. p. 481.
3. Decker, Joao S. (1936). Aspectos Biologicos da Flora Brasileira. Sao Leopoldo: Rottermond & co. p. 538.
4. Correspondance from Chad Husby, including correspondance from Dr Hauks

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