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- Equisetum (category Equisetophyta)Equisetopsida. This class is often placed as the sole member of the Division Equisetophyta (also called Arthrophyta in older works), though some recent molecular...7 KB (837 words) - 12:43, 8 April 2007
- Selaginellopsida, the spikemosses Class Isoetopsida, the quillworts Division Equisetophyta, the horsetails and scouring-rushes Division Psilotophyta, the whisk...4 KB (430 words) - 04:58, 8 April 2007
- They include the following extant groups: Lycopodiophyta (clubmosses) Equisetophyta (horsetails) Psilotophyta (whisk ferns) Ophioglossophyta (adders'-tongues...7 KB (745 words) - 04:55, 4 April 2007