Osmunda × ruggii is a sterile hybrid between Osmundastrum claytonianum and Osmunda regalis var. spectabilis.[1]

References

  1. ^ Hassler, Michael (2004–2021), "Genus Osmunda", World Ferns. Synonymic Checklist and Distribution of Ferns and Lycophytes of the World. Version 12.4, retrieved 2021-09-24