sensitive fern

noun
a common, widely distributed fern, Onoclea sensibilis, having large, triangular leaves and beadlike spikes that contain the spores.

Origin:
1805–15, Americanism; so called from the sensitivity of its foliage to frost

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WordNet
sensitive fern

noun
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 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Scattered between the hummocks are pools that contains species such as marsh marigold, and sensitive fern.
There is a dense herb layer with sensitive fern and, locally, ostrich fern.
Dominant vegetation includes red maple, yellow birch, and sensitive fern.
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