Sphenophyllales is an extinct order of articulate land plants and a sister group to the present-day Equisetales (horsetails). They are known known from fossils dating from the Devonian to the Triassic. They were common during the Late Pennsylvanian to Early Permian, with most of the fossils coming from the Carboniferous period. Sphenophylls are sm...
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http://en.wikipedia.org/wiki/Sphenophyllales
(from the article `Sphenophyta`) ...family, Pseudoborniaceae, with a single extinct species, Pseudobornia ursina; 15 to 20 metres (50 to 65 feet) tall.†Order SphenophyllalesExtinct ... ...feet) in diameter and 30 metres (100 feet) in height. Their leaves—like those of extant horsetails—were arranged in spokelike whorls at...
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http://www.britannica.com/eb/a-z/s/139
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