silvery spleenwort

a fern, Diplazium pycnocarpon, of eastern North America, having fronds from 20 to 30 inches (50.8 to 76.2 cm) long on yellowish-green stalks. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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silvery spleenwort

1. fern with elongate silvery outgrowths enclosing the developing spores 
2. North American fern with narrow fronds on yellowish leafstalks 
WordNet® 3.0, © 2006 by Princeton University.
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