osmunda clatonia

English Thesaurus

1. North American fern having tall erect pinnate fronds and a few sporogenous pinnae at or near the center of the fertile fronds (noun.plant)

hypernym	:	flowering fern, osmund,
definition	:	any fern of the genus Osmunda: large ferns with creeping rhizomes; naked sporangia are on modified fronds that resemble flower clusters (noun.plant)