English: Eusporangiate ferns; Horsetails and primitive ferns.
Synonym: Arthrophyta; Calamophyta; Sphenophyta; Sphenopsida.
Clades:
Equisetanae;
Pteridophyta;
Plants.
Members: 1 order
Equisetales.
Habitat: wet areas.
Families1.
Psilotaceae: only
Family in Pislotales; Whisk ferns; 2 genera, Psilotum, Tmesipteris.
4.
Equisetaceae: only
Family in
Equisetales; 1 genus: Equisetum.
5.
Marattiaceae: only
Family in
Marattiales; 6 genera, Angiopteris, Christensenia, Danaea, Marattia, Eupodium, Ptisana.
7.
Ophioglossaceae: only
Family in
Ophioglossales; 4 genera, Ophioglossum, Botrychium, Helminthostachys, Mankyua.
TaxonomyIn the Ppg1 classification
Equisetidae is a subclass in the Euphyllophytes od Pteridopsida, the ferns in a narrow sense without the
Lycopodianae.
In older classifications
Equisetidae was seen as a separate division of spore plants.
Plant theoryIn the
Plant theory Equisetidae is the second subclass in the class
Equisetanae, in the
Pteridophyta.
Equisetidae has 1 Order
Equisetales in
Phase 1.
BotanyHerbs; vascular; ± 410 million years old
Reproduction: by shedding spores; bear a protostele; having microphylls.
Stem: single, vertical.
Leaves: needle-like, radiating at regular intervals from the stem; have only a single vein.
Orders1
Equisetales