International Equisetological Association Equisetum, Equisetaceae

International Research Botany Group - International Botany Project - Non Profit Research Institute - Research Service - Botanical Team. IEA Promotes Research and Teaching of Taxonomy, Systematics and Phylogeny of Equisetum (Horsetail).

Equisetum is the single surviving genus of a class of ancient vascular plants that dates back to the mid-Devonian period (350 + million years ago).

The IEA is a non-profit scientific association which has as its aim the promotion of the developmental
study of Equisetum Biology (Equisetology). The aim of the IEA is to integrate enthusiasts and scientists working in Equisetum,
create a representation of the association and to popularize equisetological knowledge. The IEA acts as a platform for discussion
and cooperation of all enthusiasts and biologists using Equisetum as the objects of their experiments, pure and applied.

IEA has over 150 active members around the world, including many scientists.

The International Equisetological Association (IEA) was founded in 2008 and is dedicated to : the development of Equisetum biology; the distribution of Equisetum information; and international cooperation among Equisetologists and Pterydological organizations. The Association publishes the IEA Paper and organizes the World Equisetum ProgramResearch Service (WEP).

The IEA is a non-profit organization of multinational membership dedicated to the furtherance of all aspects of Equisetum. As an organization we support and promote education, research, and conservation in these areas. We operate as a formal 'science club' open to all professionals and enthusiasts. We are constantly growing and improving. Currently, we are primarily concerned popularization of research and the creation of networks of companies and researchers.

Themes / Objectives : Introduction to the Genus Equisetum and the Class Equisetopsida as a whole. Taxonomic Study of the Genus Equisetum. Tissue culture system for in vitro in Equisetum species. Influence of the nitrogen form on in vitro organogenesis in Equisetum species. Electron microscopy of dividing cells - spores and cells of Equisetum species. A study and comparison of the habitats of Equisetum species.


Equisetum, Equisetites

“It is believed that the genus Equisetum developed in the Tertiary, arising from the much older genus Equisetites, originating in the Paleozoic era - Permian or Carboniferous. The Triassic species Equisetites arenaceus was initially included in the genus Equisetum. Some fossil species of the genus Equisetites resemble modern horsetails so much that the generic distinction between Equisetum and Equisetites was questioned and it was suggested that Equisetum may be considered the oldest modern vascular plant”..


“According to phylogenetic analyzes carried out by Jean-Michel Guillon, the most basal representative of the genus is Equisetum bogotense. Incorporating it in the Equisetum subgenus not including the Hippochaete subgenus makes this subgenus a paraphyletic taxa”..


“Equisetaceae [Michx. ex DC.] The only modern representative is the genus Equisetum [L.] Fossil plants of this family are usually classified as Morphotaxon Equisetites. These include morphologically diverse plants known from different continents, found mainly in Triassic and younger rocks, rarely already Carboniferous” ..


“The first Equisetum-Equisetites species appeared in the upper Devon about 375 million years ago. The genus Equisetum can therefore be called living fossils” ..


“Equisetales [DC. ex Bercht. & J. Presl] Four families, of which only Equisetaceae have modern representatives. These plants occur on Earth from the Devonian, but played a special role in the Carboniferous vegetation. Plants of various sizes, from small herbaceous plants to extinct calamites reaching about 20 (30) m high. The following taxa are distinguished: Calamitaceae (+Asterocalamitaceae), Equisetaceae, Tchernoviaceae, Gondwanostachyaceae (Formerly: +Phyllothecaceae, +Schizoneuraceae). Fossil taxa with an unclear taxonomic position: Annularia, Schizoneura, Neocalamites, Spaciinodum” ..


“Equisetopsida [C. Agardh] (Sphenopsida) The class is fossil, living representatives are classified in one genus - Equisetum. Taxonomy: Equisetidae [(Warm.) / Engl. & Gilg], Equisetales [(Dumort.) / DC. ex Bercht. & J. Presl], Equisetineae [Rabenh.], Equisetaceae [Michx. ex DC.], Equisetum [L.] /// Hyeniales, Hyeniaceae /// Sphenophyllales [Seward], Sphenophyllaceae, Cheirostrobaceae /// Calamitales, Calamitaceae [Unger]” ..


“Equisetophyta [(D. H. Scott) / B. Boivin] (Sphenophyta) The group is fossil, living representatives are classified in one genus - Equisetum. Taxonomy: Equisetophytina [Reveal] (Sphenophytina), Equisetopsida [C. Agardh] (Sphenopsida)” ..


(c) IEA, Radosław Janusz Walkowiak, 2020

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IEA Current Research Projects  /

Equisetum, Equisetaceae / research project

Equisetum arvense / research project

Curators of IEA Projects  /

Chad Eric Husby / doctor of philosophy in biology, botany

Radoslaw Janusz Walkowiak / master’s degree in biology and honorary doctor in botany

Marek Nowicki / master's degree in geography


Decision Members for IEA  /

/  High Representative  /

/  Representative  /

/  Representative  /

/  IEA Administrative Clerk  /
/  IEA Paper Managing Editor  /


The Whole World

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by The International Equisetological Association (IEA)

All rights reserved. Administrator : Beth Zawada

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