Berkeley offers a brief introduction to these Sphenophyta. At the bottom of the page, you can go to sections such as fossil record, ecology/history and systematics.

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ancient trees, equisetum, foxtails, horsetail trees, scouring rushes, sphenophyta, university of california museum of paleontology, horsetail tree

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Knovation Readability Score: 5 (1 low difficulty, 5 high difficulty)

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