osmund(n = noun.plant) flowering fern - any fern of the genus Osmunda: large ferns with creeping rhizomes; naked sporangia are on modified fronds that resemble flower clusters;
is a kind of fern
is a member of genus osmunda
has particulars: ditch fern, french bracken, king fern, osmunda regalis, royal fern, royal osmund, interrupted fern, osmunda clatonia, cinnamon fern, fiddlehead, fiddlehead fern, osmunda cinnamonea

   A fern of the genus Osmunda, or flowering fern. The most remarkable species is the osmund royal, or royal fern (Osmunda regalis), which grows in wet or boggy places, and has large bipinnate fronds, often with a panicle of capsules at the top. The rootstock contains much starch, and has been used in stiffening linen. [1913 Webster]

osmund, n. (also osmunda) any fern of the genus Osmunda, esp. the royal fern, having large divided fronds.

Etymology:
ME f. AF, of uncert. orig.

royal osmund