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Equisetum

Equisetum (class Sphenopsida, family Equisetaceae) The sole surviving genus of its class and family, comprising the horsetails, which typically are plants of damp places. They are vascular cryptogams with hollow stems, tiny, scale-like leaves, branches in whorls, and apical, spore-producing cones. The spores germinate into prothalli bearing the sex organs. The sperms are multiciliate. There are 29 species, almost cosmopolitan in distribution except for Australasia. In Carboniferous times the Sphenopsida produced tree-like forms. One such is Calamites, a common coal-measure fossil, which grew to heights of 30 m and, apart from its size and woody stems, closely resembled Equisetum.

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"Equisetum." A Dictionary of Plant Sciences. . Encyclopedia.com. 18 Aug. 2017 <http://www.encyclopedia.com>.

"Equisetum." A Dictionary of Plant Sciences. . Encyclopedia.com. (August 18, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/equisetum-0

"Equisetum." A Dictionary of Plant Sciences. . Retrieved August 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/equisetum-0

Equisetum

Equisetum See SPHENOPSIDA.

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"Equisetum." A Dictionary of Earth Sciences. . Encyclopedia.com. 18 Aug. 2017 <http://www.encyclopedia.com>.

"Equisetum." A Dictionary of Earth Sciences. . Encyclopedia.com. (August 18, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/equisetum

"Equisetum." A Dictionary of Earth Sciences. . Retrieved August 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/equisetum