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Equisetophyta
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Brief description of the horsetail family, including descriptions of several Equisetum species.
site exerpt
BoDD (Botanical Dermatology Database EQUISETACEAE This family consists of a single genus, Equisetum, containing 23 species which are of cosmopolitan distribution except in Australasia.Equisetum spp horsetails) contain a thiaminase; the effects of poisoning in animals from ingestion of the plants are similar to those of...General description of this family of terrestrial, herbaceous, homosporous vascular plants, comprising a single genus with about 15 species. Includes photos of several Equisetum species.
site exerpt
Non-Flowering Plant Families, UH Botany Equisetaceae are terrestrial, herbaceous, homosporous vascular plants comprising a single genus with about 15 species. The free-living sporophytic plant body consists of a rhizome with adventitious roots, and an aerial portion with ribbed, silicified stems that are hollow except at...Includes phylum description, and links to images of members of the Equisetaceae (horsetails).
http://www.science.siu.edu/landp...nts/Sphenophyta/sphenophyta.html