Concise hierarchy

(Kingdom) Plantae - (Phylum) Tracheophyta - (Class) Polypodiopsida

Current position

Equisetidae (Subclass) Warm. (1883)

Ref: PPG I, 2016: 570.

Alternative positions

Equisetinae (Class)	Ref: L.J. Audus & V. Heywood, 1981: 1359.
Equisetopsida (Class) C.Agardh (1825)	Ref: Новіков, А. & Барабаш-Красни, Б. / Novikoff, A. & Barabasz-Krasny, B., 2015: 47.
Equisetopsida (Subdivision) Agardh (1825)	Ref: J.T. Mickel, 1982: 340.

Historical positions

Equisetidae (Subclass) Warm. (1883)	Ref: D.J. Mabberley, 2017: App. (p. 997).
Equisetidae (Subclass) Warm. (1883)	Ref: PPG I, 2016: 570.
Equisetidae (Subclass) Warm. (1883)	Ref: M.A. Ruggiero et al., 2015b: table 2 (p. 32).
Equisetopsida (Class) C.Agardh (1825)	Ref: A. Novikoff & B. Barabasz-Krasny, 2015: 47.
Sphenophyta (Phylum)	Ref: T.N. Taylor et al., 2009: App. 1 (p. 1028).
Equisetopsida (Class) C.Agardh (1825)	Ref: D.J. Mabberley, 2008: 310, 928.
Equisetopsida (Class) C.Agardh (1825)	Ref: A.R. Smith et al., 2006: 709, fig. 2; 726.
Equisetopsida (Class) C.Agardh (1825)	Ref: A.B. Doweld, 2001: VII.
Equisetopsida (Class) C.Agardh (1825)	Ref: C.J. Cleal & B.A. Thomas, 1995: 13.
Equisetopsida (Subdivision) Agardh (1825)	Ref: J.T. Mickel, 1982: 340.
Equisetopsida (Class) C.Agardh (1825)	Ref: S.P. Parker, 1982: 1079. [alternative position]
Equisetinae (Class)	Ref: L.J. Audus & V. Heywood, 1981: 1359.

Number of Subtaxa

2024	Available in Systema Naturae 2000	1f;1g;15s;2v; †9f;22g;2s
1989-present	Systema Naturae 2000: 4 Mar 2023	[1f;1g;15s; †9f;22g]
2017	D.J. Mabberley: 335, App. (p. 997)	[1f;1g;15s]
2016	PPG I: 571	[1f;1g]
2015	A. Novikoff & B. Barabasz-Krasny: 48	[1f;1g; †9f;22g]
2008	D.J. Mabberley: 310	1f;[1g;15s]
2006	A.R. Smith et al.: 709	[1f;1g;15s]
2001	A.B. Doweld: VII	[1f]
1995	C.J. Cleal & B.A. Thomas: 13	[1f; †5f]
1982	J.T. Mickel	1f1g15s
1981	L.J. Audus & V. Heywood	1g~15s