| Osmundaceae | |
Osmunda regalis fo. abyssinica
| Kuhn | van der Decken's Reis. 3: 59 | 1879 |
| Osmundaceae | |
Osmunda regalis fo. anomala
| (Farw.) S.K. Harris | Rhodora 35: 352 | 1933 |
| Osmundaceae | |
Osmunda regalis subvar. anomala
| Farw. | Amer. Midl. Naturalist 12: 307 | 1931 |
| Osmundaceae | |
Osmunda regalis var. biformis
| Benth. | Fl. Hongk. 440 | 1861 |
| Osmundaceae | ** |
Osmunda regalis var. brasiliensis
| (Hook. & Grev.) Pic. Serm. | Webbia 31(1): 247 | 1977 |
| Osmundaceae | ! |
Osmunda regalis var. brasiliensis
| (Hook. & Grev.) Kunze | Linnaea 18: 308 | 1844 [1845] |
| Osmundaceae | |
Osmunda regalis var. brevifolia
| Desv. | Mém. Soc. Linn. Paris 6(2): 198 | 1827 |
| Osmundaceae | |
Osmunda regalis var. capensis
| (C. Presl) Milde | Fil. Eur. Atlan. 179 | 1867 |
| Osmundaceae | |
Osmunda regalis fo. divisa
| Makino | in Makino & Nemoto, Fl. Jap. 1566 | 1925 |
| Osmundaceae | |
Osmunda regalis fo. intercallata
| Dole | Fl. Vermont (ed. 3) 4 | 1937 |
| Osmundaceae | |
Osmunda regalis subsp. japonica
| (Thunb.) Á. Löve & D. Löve | Taxon 26(2–3): 324 | 1977 |
| Osmundaceae | |
Osmunda regalis var. japonica
| (Thunb.) Milde | Fil. Eur. Atlan. 179–180 | 1867 |
| Osmundaceae | |
Osmunda regalis fo. linearis
| Clute | Fern Bull. 17: 10 | 1909 |
| Osmundaceae | |
Osmunda regalis var. longifolia
| C. Presl | Suppl. Tent. Pterid. 62 | 1845 |
| Osmundaceae | |
Osmunda regalis fo. nana
| Fernald | Rhodora 51(605): 103 | 1949 |
| Osmundaceae | |
Osmunda regalis var. obtusifolia
| (Kaulf.) Milde | Fil. Eur. Atlan. 179 | 1867 |
| Osmundaceae | |
Osmunda regalis fo. orbiculata
| Clute | Fern Bull. 14: 115 | 1906 |
| Osmundaceae | |
Osmunda regalis var. palestris
| C. Chr. | | |
| Osmundaceae | |
Osmunda regalis subsp. palustris
| (Schrad.) Á. Löve & D. Löve | Taxon 26(2–3): 324 | 1977 |
| Osmundaceae | |
Osmunda regalis var. palustris
| (Schrad.) C. Chr. ex Angely | Fl. Paraná 23: 10 | 1963 |
| Osmundaceae | |
Osmunda regalis var. panigrahiana
| R.D. Dixit | Indian J. Forest. 13: 71 | 1990 |
| Osmundaceae | |
Osmunda regalis fo. regalis
| | | |
| Osmundaceae | |
Osmunda regalis subsp. regalis
| | | |
| Osmundaceae | |
Osmunda regalis var. regalis
| | | |
| Osmundaceae | |
Osmunda regalis subsp. spectabilis
| (Willd.) Á. Löve & D. Löve | Taxon 26(2/3): 324 | 1977 |
| Osmundaceae | |
Osmunda regalis var. spectabilis
| (Willd.) A. Gray | Manual (ed. 2) 600 | 1856 |
| Osmundaceae | |
Osmunda regalis var. sublancea
| Christ | | ** |