Concise hierarchy
	(Kingdom) Plantae - (Phylum) Tracheophyta - (Class) Isoetopsida - (Order) Isoetales
Current position
	Alternative positions
	
		Historical positions
		
			
				| Isoetales (Order) Prantl (1874) | 
					Ref: 
						
							D.J. Mabberley, 2017: 471, App. (p. 997).
						 | 
				
				
					| Isoetales (Order) Prantl (1874) | 
						Ref: 
							
								T.N. Taylor et al., 2009: table (p. 266), App. 1 (p. 1028).
							 | 
					
					
						| Isoetales (Order) Prantl (1874) | 
							Ref: 
								
									D.J. Mabberley, 2008: 437, 928; 507.
								 | 
						
						
							| Isoetales (Order) Prantl (1874) | 
								Ref: 
									
										C.J. Cleal & B.A. Thomas, 1995: 13.
									 | 
							
							
								| Lycopsida (Class) | 
									Ref: 
										
											R. van der Meijden, 1990: 55.
										 | 
								
								
									| Isoetales (Order) Prantl (1874) | 
										Ref: 
											
												J.T. Mickel, 1982: 338.
											 | 
									
									
										| Pteridophyta (Division) Schimp. (1879) | 
											Ref: 
												
													D.M. Moore, 1982: 1.
												 [rough position] [indirect] | 
										
									
									Number of Subtaxa