| Boweniaceae | |
Boweniaceae
| D.W. Stev. | Amer. J. Bot. 68: 1114 | 1981 |
| Unknown | ! |
Bucklandia
| Sternb. | Versuch Fl. Vorwelt 1: 333 | 1825 |
| Unknown | * |
Ctenidium
| Heer | Contr. Fl. Foss. Portugal. 17 | 1881 |
| Cycadaceae | !! |
Cycadaceae
| Pers. | Syn. Pl. 2: 630 | 1807 |
| Dioaceae | |
Dioaceae
| Doweld | Prosyllab. Tracheophyt. xv | 2001 |
| Encephalartaceae | |
Encephalartaceae
| Schimp. & Schenk | Handb. Palaeont., Paleophyt. 215 | 1880 |
| Microcycadaceae | |
Microcycadaceae
| Tarbaeva | Anat.-Morf. Str. Sem. Cycad. 19 | 1991 |
| Stangeriaceae | |
Stangeriaceae
| Schimp. & Schenk | Handb. Palaeont., Paleophyt. 216 | 1880 |
| Zamiaceae | |
Zamiaceae
| Horan. | Prim. Lin. Syst. Nat. 45 | 1834 |