The Ferns (Equisetidae) - subclass
(Equisetales) - order
(Archaeocalamitaceae) - family
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(Calamitaceae) - family
(Annularia)

(Annularia stellata)

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()

()
(Arthropitys)

(Arthropitys )

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(Asterophyllites)

(Asterophyllites )

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(Astromyelon)

(Astromyelon )

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()

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(Calamites)

(Calamites carinatus)

(Calamites suckowi)

(Calamites undulatus)
(Calamocarpon)

(Calamocarpon )

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()

()
(Calamostachys)

(Calamostachys binneyana)

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()

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(Cingularia)

(Cingularia )

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()

()
(Mazostachys)

(Mazostachys )

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(Paleostachya)

(Paleostachya )

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(Equisetaceae) - family
(Equisetum)

(Equisetum dimorphum)
-extinct-

(Equisetum thermale)
-extinct-
(Equisetum) - subgenera
Common Horsetail
(Equisetum arvense)
Andean Horsetail
(Equisetum bogotense)
Himalayan Horsetail
(Equisetum diffusum)
water Horsetail
(Equisetum fluviatile)
Marsh Horsetail
(Equisetum palustre)
Meadow Horsetail
(Equisetum pratense)
Wood Horsetail
(Equisetum sylvaticum)
Northern Giant Horsetail
(Equisetum telmateia)
(Hippochaete) - subgenera
Southern Giant Horsetail
(Equisetum giganteum)
Rough Horsetail
(Equisetum hyemale)
Smooth Horsetail
(Equisetum laevigatum)
Mexican Giant Horsetail
(Equisetum myriochaetum)
Branched Horsetail
(Equisetum ramosissimum)
Dwarf Horsetail
(Equisetum scirpoides)
Variegated Horsetail
(Equisetum variegatum)
(Equisetites) -extinct-

(Equisetites )

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(Pseudoborniales) - order -extinct-
(Pseudoborniaceae) - family
(Pseudobornia)

(Pseudobornia ursina)
(Sphenophyllales) - order -extinct-
(Sphenophyllum)

(Sphenophyllum biarnicum)

(Sphenophyllum coemansii)

(Sphenophyllum cuneifolium)

(Sphenophyllum emarginatum)

(Sphenophyllum gilmorei)

(Sphenophyllum latifolium)

(Sphenophyllum longifolium)

(Sphenophyllum majus)

(Sphenophyllum miravallis)

(Sphenophyllum multirame)

(Sphenophyllum myriophyllum)

(Sphenophyllum oblongifolium)

(Sphenophyllum paranaense)

(Sphenophyllum plurifoliatum)

(Sphenophyllum stoukenbergi)

(Sphenophyllum subtenerrimum)

(Sphenophyllum tenuifolium)

(Sphenophyllum thonii)

(Sphenophyllum verticillatum)
(Hamatophyton)

(Hamatophyton verticillatum)
(Rotafolia)

(Rotafolia songziensis)
(Xihuphyllum)

(Xihuphyllum )

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()

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(Sphenophyllostachys)

(Sphenophyllostachys )

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()

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(Bowmanites)

(Bowmanites )

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(Gondwanophyton)

(Gondwanophyton )

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(Peltastrobus)

(Peltastrobus )

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()

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(Sentistrobus)

(Sentistrobus )

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(Columnisporites)

(Columnisporites )

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(Cheirostrobus)

(Cheirostrobus )

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(Lilpopia)

(Lilpopia )

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