Similar Species
There are three very similar species, Osmunda spectabilis, Osmunda lancea and Osmunda japonica. Recent genetic analysis (Metzgar et al., 2008) has shown that the New World varieties are in a clade that is sister to the Old World varieties of Osmunda regalis. If this is true, then O. lancea and O. japonica should either be regarded as varieties of O. regalis, or, conversely, O. regalis var. spectabilis should be regarded as a separate species, Osmunda spectabilis Willdenow. The var. brasiliensis would then be Osmunda spectabilis Willdenow var. brasiliensis Hooker & Greville.
Read more about this topic: Osmunda Regalis
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