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sensitive fern, bead fern, Onoclea sensibilis | beautiful spreading fern of eastern North America and eastern Asia naturalized in western Europe; pinnately divided fronds show a slight tendency to fold when touched; beautiful spreading fern of eastern North America and eastern Asia naturalized in western Europe; pinnately divided fronds show a slight tendency to fold when touched; pinnules enclose groups of sori in beadlike lobes ❲Onoclea sensibilis❳ |