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Sphenopsida US English

A class of pteridophyte plants that comprises the horsetails and their extinct relatives

Sphenopsida in calamite US English

A jointed-stemmed swamp plant of an extinct group related to the horsetails, growing to a height of 60 feet (18 m). Calamites are characteristic fossils of the Carboniferous coal measures

Sphenopsida in horsetail US English

A nonflowering plant with a hollow jointed stem that bears whorls of narrow leaves, producing spores in cones at the tips of the shoots

Sphenopsida in Pteridophyta US English

A division of flowerless green plants that comprises the ferns and their relatives