Family Onocleaceae Pichi-Sermolli 1970 (fern)
Polypodiopsida - Polypodiales - Polypodiidae
Parent taxon: Aspleniineae according to PPG. I 2016
Sister taxa: Aspleniaceae, Thelypteridaceae
Subtaxa: Onoclea
Distribution:
• Eocene of United States (1: North Dakota collection)
• Clarkforkian of United States (1: North Dakota)
• Paleocene of Canada (6: Saskatchewan), United States (11: Montana, North Dakota, Wyoming)
• Cretaceous of Canada (2: Alberta, British Columbia), United States (2: South Carolina, Wyoming)
Total: 23 collections each including a single occurrence