Table 1.

Information on fossil species included in phylogenetic backbone analyses.

Species	References	Type locality	Age	Type of preservation
Chloranthistemon endressii Crane, Friis and Pedersen	Crane et al. (1989); Eklund et al. (1997)	Åsen, Höganäs AB, Scania, Sweden	Late Cretaceous (Late Santonian/Early Campanian)	Charcoalified/lignitized
Dakotanthus cordiformis (Lesq.) Manchester, Dilcher, Judd and Basinger	Basinger and Dilcher (1984); Manchester et al. (2018)	Ottawa County, Kansas, USA	Mid‐Cretaceous (Late Albian/Early Cenomanian)	Compression/impression/casts and molds
Kajanthus lusitanicus Mendes, Grimm, Pais and Friis	Mendes et al. (2014)	Chicalhão (opencast clay pit), Juncal, Portugal	Early Cretaceous (Late Aptian/Early Albian)	Charcoalified
Mauldinia mirabilis Drinnan, Crane, Friis and Pedersen	Drinnan et al. (1990)	West of Mauldin Mountain, Elk Neck Peninsula, Maryland, USA	Mid‐Cretaceous (Cenomanian)	Charcoalified/lignitized
Microvictoria svitkoana Nixon, Gandolfo and Crepet	Gandolfo et al. (2004)	Old Crossman Clay Pit, Sayreville, New Jersey, USA	Late Cretaceous (Turonian)	Charcoalified
Paleoclusia chevalieri Crepet and Nixon	Crepet and Nixon (1998a)	Old Crossman Clay Pit, Sayreville, New Jersey, USA	Late Cretaceous (Turonian)	Charcoalified
Paradinandra suecica Schönenberger and Friis	Schönenberger and Friis (2001)	Åsen, Höganäs AB, Scania, Sweden	Late Cretaceous (Late Santonian/Early Campanian)	Charcoalified
Spanomera mauldiniensis Drinnan, Crane, Friis and Pedersen	Drinnan et al. (1991)	West of Mauldin Mountain, Elk Neck Peninsula, Maryland, USA	Late Cretaceous (Cenomanian)	Charcoalified/lignitized
Tylerianthus crossmanensis Gandolfo, Nixon and Crepet	Gandolfo et al. (1998)	Old Crossman Clay Pit, Sayreville, New Jersey, USA	Late Cretaceous (Turonian)	Charcoalified
Virginianthus calycanthoides Friis, Eklund, Pedersen and Crane	Friis et al. (1994)	Puddledock, Hopewell, Virginia, USA	Early Cretaceous (Early or Middle Albian)	Charcoalified